壳聚糖基复合膜的制备与性能评价

题名:壳聚糖基复合膜的制备与性能评价
作者:熊莺
学位授予单位:哈尔滨工业大学
关键词:壳聚糖;;共混改性;;载硝酸铈药膜
摘要:

 用生物材料开发新型敷料在皮肤创伤治疗中具有重要的现实意义,而壳聚糖以其独特而优良的性质成为该研究领域的热点。本文研究的壳聚糖基复合膜是一种以壳聚糖为基体,加入了其他组分和药物的多元共混改性膜,主要应用于新型敷料领域。

 本课题主要研究内容及成果包括:1.壳聚糖及其他组分的基本物化性质研究:该研究探讨了各组分的溶解性、混溶性等,并测定了壳聚糖脱乙Neodymium Magnets酰度为95.98%,粘均分子量在5.96×105~6.18×105之间;2.系统制备了从一元纯CS膜到四元组分膜:在充分了解原料的基本物化性质基础上,按照膜的起膜性、水溶性、吸水性、透水蒸气、力学舒适性等逐级筛选,最终确定了CGPGL0.6组分配比膜的综合性能最好,并系统研究了聚乙烯醇、明胶、甘油这种三组分对膜性能影响的变化规律;3.载药膜的制备、性能测试与表征,该研究选取硝酸铈等药物,以最终优化四元膜为载体制备了载药膜并测试了相关性能,最终发现载硝酸铈的四元优化膜有较好的综合性能,这为开发新型医用敷料与稀土化合物的医用价值提供了较好的借鉴。本文为更好的对材料进行性能评价http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets与表征,引用了YY/T 0471(《接触性创面敷料试验方法》)国家标准,并进行了FIR、XRD、SEM表征,结果表明:共混成分的加入扰乱了各自的结晶情况,增强了各组分间的相容性。
学位年度:2010

Mg-xGd-0.6Zr合金组织与性能研究

题名:Mg-xGd-0.6Zr合金组织与性能研究
作者:邓娟
学位授予单位:重庆大学
关键词:镁合金;;微观组织;;性能;;钆;;锆
摘要:

 与其它金属结构材料相比,镁的密度低,阻尼性能高,电磁屏蔽性能优异,导热导电性能好,镁及镁合金的应用受到了一定关注。镁及镁合金是一种集结构与功能于一体的理想金属材料,但密排六方晶体结构的镁滑移系少,塑性成形困难;且纯镁强度低,抗拉强度仅为100MPa,弹性模量只有45GPa。塑性成形困难和强度低是Neodymium Magnets影响镁及镁合金工业化应用的两个瓶颈。近年来,稀土镁合金特别是Mg-Gd系合金因其具有优异的室温和高温力学性能而得到重视。

 本课题通过半连续浇铸法在纯Mg基础上添加xGd(x=2,4,6%)和0.6%Zr(质量分数,下同),采用X射线荧光分析、光学显微分析、扫描电子显微镜结合能谱分析、X射线衍射分析以及透射电子显微分析等方法研究了Gd含量对不同热处理及挤压态的Mg-xGd-0.6Zr合金显微组织的影响,利用显微硬度及拉伸性能表征了材料各个状态下的力学性能,分析得到低Gd含量的Mg-Gd系合金的强化机理及塑性机理。

 研究结果表明:铸态Mg-xGd-0.6Zr(x=2,4,6%)合金呈明显的晶粒结构组织,没有出现Gd的枝晶偏析。随Gd含量增加,固溶态Mg-xGd-0.6Zr合金晶粒略微减小,退火态合金中第二相依次增加。退火态合金中第二相Mg5.05Gd主要有两种形貌,一种尺寸约5μm×5μm×1μm规则矩形相,一种不规则相。该Mg5.05Gd相在退火态Mg-4Gd-0.6Zr和Mg-6Gd-0.6Zr合金中质量百分比分别为2.787wt.%和5.340wt.%。

 随着Gd含量的增加,铸态和退火态Mg-xGd-0.6Zr合金单位质量百分比含量的强度增加率增加明显。固溶态合金中Gd的原子百分比与硬度呈直线关系,且与固溶态Mg-Gd二元合金相比,Zr的加入使单位Gd含量在镁合金http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets中的固溶强化作用减弱。随固溶温度的增加,Mg-6Gd-0.6Zr合金的晶粒尺寸增大,420°C下合金显微硬度值最大,460°C下合金中原子基本完全固溶。Mg-6Gd-0.6Zr合金最佳固溶工艺为300°C×6h+460°C×10h。

 不同状态合金经挤压后,Mg-2Gd-0.6Zr和Mg-4Gd-0.6Zr合金强度相差不大,Mg-6Gd-0.6Zr合金强度最高;三种合金的延伸率都超过30%。铸态挤压Mg-2Gd-0.6Zr、Mg-4Gd-0.6Zr和Mg-6Gd-0.6Zr合金的抗拉强度与屈服强度依次为206、207、237MPa与150、145、168MPa,延伸率依次为36.8%、43.4%、33.4%。Mg-6Gd-0.6Zr合金时效10h后,塑性变化较小,强度略有提高,抗拉强度和屈服强度分别为243、175MPa,延伸率为31.7%。所有合金的断裂方式都为韧性断裂。

 该Mg-xGd-0.6Zr系合金强度的强化方式包括细晶强化、固溶强化、第二相强化以及形变强化四种强化方式。屈服强度与各个强化方式的贡献值可线性表示。Mg-xGd-0.6Zr合金的塑性机理主要由降低c/a比值和细化晶粒共同贡献。该合金系出现具有明显高低屈服点和屈服平台的屈服现象,主要原因是位错的增殖以及位错与固溶原子的相互作用。
学位年度:2010

K掺杂SnO_2和V掺杂ZnO稀磁半导体粉末的结构和磁性研究

题名:K掺杂SnO_2和V掺杂ZnO稀磁半导体粉末的结构和磁性研究
作者:唐小梅
学位授予单位:天津大学
关键词:稀磁半导体;;溶胶凝胶法;;K掺杂SnO_2;;V掺杂ZnO;;室温铁磁性
摘要:

 稀磁半导体( DMSs )是指在非磁性半导体材料基体(通常是AB )中通过掺入少量磁性过渡族金属元素或稀土金属元素使其获得铁磁性能的一类新型功能材料。目前,在DMSs材料中发现了许多新的物理现象,如巨法拉第效应、巨塞曼Neodymium Magnets分裂、反常霍尔效应、巨负磁阻效应、磁致绝缘体金属转变等。利用这些效应,可以制备出各种新型功能器件,为一些科技的发展提供条件。因此,这种新型材料的研究倍受人们的关注。

 本文利用溶胶-凝胶法成功地制备出了一系列K-SnO_2和V-ZnO稀磁半导体纳米粉末。利用X射线衍射仪( XRD )、透射电镜( TEM )、X射线光电子能谱( XPS )及物理性能测试仪( PPMS-9 )中的样品振动磁强计( VSM )对样品的结构和磁性进行了表征。

 在K-SnO_2体系中,所有样品均为二氧化锡金红石结构,颗粒大小约几个纳米;K元素以+1价存在;样品具有室温铁磁性,且饱和磁化强度随着掺杂浓度的增大而增强。将K掺杂浓度为4%的样品和纯SnO_2样品在氧气下退火后,掺杂K的样品仍然具有室温铁磁性,因此氧空位不是引起铁磁性的主要来源。当一个K元素取代一个Sn的位置时,由于K、Sn化合价的不同,将会产生3个阴离子空穴,阳离子可以通过这些空穴发生间接交换作用,从而导致铁磁性,具体磁学机理可以用RKKY模型来解释。

 在V-ZnO体系中,V掺杂浓http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets度低于5%时,样品具有氧化锌纤锌矿多晶结构,颗粒尺寸在二三十个纳米左右;V元素的化合价为+5价;样品呈现室温铁磁性,且样品的饱和磁化强度随着V掺杂浓度的增大而增强,掺杂浓度为3%的样品在不同温度( 500℃,600℃,700℃)的空气下退火1h后,饱和磁化强度随着退火温度的升高而增强。我们认为样品中的铁磁性来源主要是由氧空位和缺陷态密度引起的,具体磁学机理可以用束缚磁极化子模型来解释。
学位年度:2010

基于氮氧多齿配体功能配位聚合物的合成，晶体结构及性能研究

题名:基于氮氧多齿配体功能配位聚合物的合成，晶体结构及性能研究
作者:胡飞龙
学位授予单位:广西民族大学
关键词:配位聚合物;;晶体结构;;吸附分离;;荧光
摘要:

 金属有机配位聚合物由于结构其多样性和潜在的应用性而受到广泛的关注。这些聚合物中,我们采用多羧基有机配体与金属离子形成一维、二维、三维无限共价键网络,氢键及其他非价键弱作用可以用于形成氢键网络。金属有机配位聚合物材料(MOFs)作为一种新型的多孔材料,不仅在多孔材料领域的具有广泛应用,例如气体储存、分离、催化,而且它们的性质可以通过定向的选择金属离子中心和有机官能团Neodymium Magnets进行调控,因此这种材料在光学、电学、磁学、手性拆分等领域展示出更加诱人的应用前景。

 本文对氮氧多齿配体配合物的研究情况进行了详细的综述。通过水热法,溶剂热,溶液法,扩散法合成了十几个配位化合物,通过元素分析,X-射线单晶衍射仪,红外光谱,XRD等分析测试手段表征了这些配位化合物的结构。并选择性测定了其中一些配合物的荧光性质,电化学性质,热稳定性等。全文分为六章。

 第一章为前言,对当前微孔MOFs的发展及研究现状进行简明介绍,讨论了本课题的选题意义,并对本课题目前所取得的进展进行了综述。

 第二章介绍了以5-甲基-3-吡啶甲酸和吡唑基吡啶甲酸为配体以4,4′-联吡啶,2,2′-联吡啶为辅助配体,定向构筑了7个由亲水或者疏水主体及水簇客体分子的配位聚合物。客体水分子的形态各异,有二聚物、三聚物、六聚物、十聚物等,在形态上表现出螺旋链结构、分子层结构、笼状结构,并通过氢键及其他非价键弱作用连接起来。

 第三章描述了以4,4′-二羧基二苯醚、对苯二甲酸、联苯二甲酸通过控制有机配体的大小,控制节点的个数及配位数,选择合适的模板试剂等有效地控制合成出5个微孔配位聚合物定向构筑了5个微孔MOFs [Cu_2(oba)_2·(DMF)_2(H_2O),[Cu_2(4,4′-bpy)_5(H_2O)_4](ClO_4)_4(4,4′-bpy)(DMF)_2(H_2O)_2 (10),Na_2K[Cd_3 (tpca)_6(DMF)_2](12),Na[Cd_2(bdca)](13)。随着配体长度的变化孔径也随着发生改变,相应的体积也发生改变。在氮气气氛下在200度没有发生坍塌,说明具有很高的稳定性,这对于微孔材料来说非常重要。

 第四章和第五章研究了4,4′-二羧基二苯醚的其他类配位聚合物。除了选择柔性桥联配体之外,我们还选用了螯合配体如2,2′-联吡啶及啉菲罗啉等作为第二配体。并研究了氢键、π-π堆积、非价键弱作用在http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets结构稳定性起的作用。

 第六章合成了十几种吡唑衍生物配体及相对应的稀土配合物,我们系统地分析了这十几种配合物的发光性质,并考察了选用啉菲罗啉作为敏化剂对发光性能产生的影响,其发光强度比没有加敏化剂强30%以上。并制备了高分子微球包裹的高效荧光探针以获得更强的荧光性质。
学位年度:2010

La_（1-X）Ce_XMnO_3纳米粉体的制备及净化CNG汽车尾气的活性研究

题名:La_（1-X）Ce_XMnO_3纳米粉体的制备及净化CNG汽车尾气的活性研究
作者:陈海峰
学位授予单位:天津大学
关键词:钙钛矿;;CNG发动机;;尾气排放;;催化净化
摘要:

 随着汽车保有量的大幅增加和世界范围内石油危机的日益严重,降低车用动力的燃料消耗和尾气排放已经成为汽车消费者和生产者共同关注的话题。利用清洁能源燃料代替柴油、汽油等传统燃料是解决这一问题的有效途径之一,天然气(NG)作为一种绿色替代燃料逐渐成为人们研究的热点。本论文针对压缩天然气汽车排Neodymium Magnets放中CH_4浓度高且难氧化的特点,研制稀土钙钛矿型La_(1-X)Ce_XMnO_3纳米粉体,开发适用于压缩天然气汽车尾气后处理的催化转化器,具体研究内容如下:

 1.采用溶胶-凝胶法制备一系列La_(1-X)Ce_XMnO_3(x = 0,0.2,0.4,0.6,0.8)钙钛矿催化剂粉体,利用X射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等测试技术对其结构和形貌进行研究。考察焙烧温度和Ce取代量x值对La-Ce-Mn型钙钛矿晶体结构的影响。

 2.结果表明焙烧温度在700℃以上时样品中才出现明显的钙钛矿结构,800℃焙烧制备的样品粒径比较均匀,钙钛矿含量比较丰富;Ce取代量x值对钙钛矿晶体结构影响较大,x = 0.2时,样品的钙钛矿晶体结构属于四方晶系,x > 0.2时样品的钙钛矿晶体结构转变成三方晶系。

 3.将La_(1-X)Ce_XMnO_3纳米粉体分散在γ-Al_2O_3浆料中,以堇青石蜂窝陶瓷为载体制备La_(1-X)Ce_XMnO_3(x = 0.2,0.4,0.6)/γ-Al_2O_3/堇青石蜂窝陶瓷催化转化器。并在自行设计和建设的催化燃烧平台上考察不同Ce取代量的钙钛矿催化剂对模拟CNG发动机尾气中CH_4、CO和NOX的催化转化作用。

 4. Ce取代量x对催化http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets剂的催化活性有较大影响。

 1)随着x由0.2增加至0.6,CH_4的初始转化温度Ti由100升高至200,而低温条件下的转化率逐步降低;相应的CH_4的最终转化率没有明显变化,分别是31.3%,31.1%和33.4%。

 2)随着x由0.2增加至0.6,CO的初始转化温度Ti、半转化温度(T50)逐步降低;而完全转化温度(T100)则在x = 0.4时出现最小值。

 3) x的变化对NO的初始转化温度、转化率没有明显的影响。
学位年度:2010

钒酸钇晶体的生长及其结晶特性的研究

题名:钒酸钇晶体的生长及其结晶特性的研究
作者:王友发
学位授予单位:天津大学
关键词:钒酸钇晶体;;提拉法;;结晶;;白光;;LED
摘要:

 YVO_4晶体是一种非常优良的双折射、铁电晶体,具有四方晶系结构,空间群为D41 9h(I41/amd)。其晶胞参数为a=b=0.71192nm,c=0.62898nm。它有着较宽的透光范围、良好的结构和物理特性,目前,它已成为性能非常优异的非线性光学晶体和优秀的激光基质晶体。

 钒酸钇有可能开发成为新型LED白Neodymium Magnets光照明材料。我们的研究目标分为两个阶段,第一,用提拉法生长钒酸钇单晶,研究它的透光性,第二,在钒酸钇晶体中掺入稀土离子,研究它的光谱特性。本文主要总结第一个阶段的工作,第二个阶段将在后续学习阶段内完成。

 本文主要报告了以下工作:

 (1)介绍了中频感应电源的工作原理,并对如何维护、常见问题的检测和处理方法作了总结。

 (2)介绍了几种常见的晶体http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets生长方法,结合本实验室的单晶生长设备,详细讲述了使用提拉法生长钒酸钇晶体的工作原理和操作步骤。

 (3)通过多次实验,生长出了完整的单晶,并总结了钒酸钇晶体的结晶特性。

 最后,以附录的形式,总结了使用中频感应炉生长钒酸钇晶体的工艺。
学位年度:2010

基于钻柱的随钻数据声波传输技术的研究与开发

题名:基于钻柱的随钻数据声波传输技术的研究与开发
作者:李超
学位授予单位:中国石油大学
关键词:信息传输;;声波;;传输特性;;声波换能器;;调制编码
摘要:

 针对空气钻井和泡沫钻井中随钻数据有效传输的问题,论文研究了随钻数据声波传输技术的关键环节,包括钻杆中声波传输特性研究、井下声波发射换能器研发、声波传输方法研究及声波发射控制电路设计。

 首先,为了研究声波在钻杆中的传输特性,采用特制的钻杆短节为传输信道,激振器和自制激励装置为激发源,在实验室进行了不同工况下钻杆中声波传输特性测试实验。分析了钻杆的结构特点和用于实验测试的声波类型及其传播特点,确定了适宜于传输信号的载波类型。通过分析对比不同频率的声波在不同长度的钻杆Neodymium magnets中的频带特性和色散特性,得出了声波传输的频率特性和衰减规律。根据实验研究结果,分析影响声波传输特性的因素,确定载波的最佳传输频率点,为设计合适的井下声波发射换能器及研究合理的声波传输方法提供了依据和指导。

 其次,根据实验结论,针对井下狭小空间和高温高压环境及供电困难状况,论文详细分析了在役的低频声波发射换能器发声原理及结构特点,设计研发了适应井下苛刻条件的压电陶瓷换能器和稀土超磁致伸缩换能器,并对两种换能器的发声性能、制作工艺、尺寸大小进行了对比。由于声波发射换能器功率有限,提出了使用变幅杆放大声波发射能量的结构设计。由于井下安装空间非常有限,提出了在http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php
特制钻铤中开槽和制作测量短节的方法。

 最后,针对钻杆信道和井下数据的特点,论文采用二进制频移键控调制随钻数据,采用差错控制正反码编码随钻数据。在声波发射控制电路设计方面,结合井下高温环境,论文采用军品级芯片作为控制芯片,完成了电路结构和发射程序的设计并对井下电源选用进行了研究。
学位年度:2010

VOCs去除光/热催化功能炭吸附材料的Sol-Gel法制备

题名:VOCs去除光/热催化功能炭吸附材料的Sol-Gel法制备
作者:孙剑
学位授予单位:东北林业大学
关键词:二氧化钛;;活性炭纤维;;稀土掺杂;;甲苯;;去除
摘要:

 随着经济的发展和社会的进步,由挥发性有机物VOCs (Volatile organic compounds)造成的室内空气污染已引起人们广泛关注。大部分室内挥发性有机物都是有毒的,环境保护组织已经证实室内空气质量的好坏是影响人类健康的重要因素Neodymium magnets之一。这些VOCs包括甲醛、苯、甲苯、低级醇、酮、含氯有机物等,主要来源于油漆,涂料,溶剂,防腐剂,空气清新剂和消毒剂。其中20余种能直接对人造成伤害甚至致癌,如甲醛、苯及苯系物和有机过氧化物等。

 目前,TiO2多相光催化在环境保护领域内的水和气相有机、无机污染物的光催化去除方面取得了较大进展,被认为是一种极具前途的环境污染深度净化技术。同时活性炭等吸附材料的吸附净化技术被普遍应用,但是由于各自的优缺点,将两者结合起来将是室内空气净化中最具前景的技术之一。而近些年人们越来越重视贵金属的热催化作用,贵金属在低温热催化氧化CO和VOCs等污染物方面具有很大潜力,而将吸附、光催化和贵金属的热催化结合,无疑在净化室内VOCs方面具有很大的新意。

 本文采用溶胶-凝胶法合成了稀土La掺杂TiO2催化剂,在自行设计的一套反应装置中,以甲苯为模拟污染物,系统的研究了掺杂量、热处理温度等参数对催化剂去除甲苯性能的影响,并在此基础上引入贵金属,考察了贵金属的掺杂量及反应温度等因素对催化剂降解甲苯的影响,而后将复合催化剂负载在ACF上,制备出Pt/LaTiO2/ACF复合催化剂,并考察了吸附、光催化和热催化的协同作用。并结合SEM、XRD和XPS等表征手段分析复合材料表面相貌和晶相结构。以GC-MS联用技术检测复合材料对甲苯去处中间产物的种类和分布。实验结果如下：

 1.以钛酸四丁酯和硝酸镧为原料,采用溶胶凝胶法,制备出稀土La掺杂TiO2光催化剂薄膜。研究表明：La掺杂可提高催http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php
化剂的可见光催化活性,2.8%La/TiO2-500℃在60min内即可完全去除6110.18mg·m-3的气相甲苯；掺入的La以La2O3的形式分布在TiO2表面,并形成Ti-O-La键；La掺杂可抑制TiO2锐钛矿相向金红石相转变、提高相转变温度、减小晶粒尺寸及增大催化剂比表面积；La/TiO2薄膜表面光滑、致密,La的引入能有效抑制TiO2膜气孔的产生；La掺杂可提高TiO2在可见光区的吸收,使催化剂吸收边向长波移动；La的f轨道的电子跃迁是催化剂可见光活性提高的重要原因。

 2.沉积在催化剂表面的Pt以吸附氧和单质的形式存在,以吸附氧形式为主。而通过光沉积Pt制备的Pt-La2O3/TiO2复合催化剂,催化剂表面羟基官能团OH-伸缩振动明显增强。Pt的掺入没有引起TiO2相结构的变化,Pt的掺入减小了晶粒尺寸并增大了催化剂的比表面积。圆形纳米Pt均匀地分布在La2O3/TiO2上,没有发生团聚现象,尺寸分布比较均一,大约为5nm-10nm。Pt的沉积增加了催化剂对可见光的吸收。通过光沉积Pt所制备的Pt-La2O3/TiO2催化剂比TiO2和La2O3/TiO2具有更高的可见光催化活性。

 3.在不同体系(LaTiO2, Pt/LaTiO2, Pt/LaTiO2/ACF)对初始浓度为13872.3 mg／m3的甲苯的降解发现,ACF的负载使Pt/LaTiO2/ACF相对于其它两种催化剂对于甲苯的吸附提高很大,Pt/LaTiO2/ACF可以在60min内完全降解初始浓度为13872.3 mg／m3的甲苯。吸附,光催化和热催化之间的有机结合大大增强了该负载型催化剂对甲苯的降解能力。TiO2/ACF和Pt/La0.28Ti10O2/ACF降解甲苯过程中产生的中间产物在种类和含量上具有较大差异。TiO2/ACF的中间产物共有9种,.中间产物以醇类、醚类、苯酚类、酸类、酮类等为主,同时含有少量的长链烷烃,中间产物种类比较宽泛,含量较大。Pt/La0.28Ti10O2/ACF的中间产物共有8种,全部为长链烷烃,可见甲苯在催化剂的作用下,甲苯中所含有的苯环被彻底打开,表明Pt/La0.28Ti10O2/ACF相对于TiO2/ACF的催化活性有很大很高。
学位年度:2010

镧掺杂二氧化钛纳米管微波法制备及光催化性能研究

题名:镧掺杂二氧化钛纳米管微波法制备及光催化性能研究
作者:贾志伟
学位授予单位:重庆大学
关键词:微波法;;镧掺杂;;TiO_2;;纳米管;;光催化性能
摘要:

 纳米材料的概念是在20世纪中叶被科学界提出的,是当今新型材料,并日益得到广泛重视和深入研究,是新材料研究中最富有活力,对社会、经济发展有着重要影响的研究对象。目前,纳米材料已经在化工、国防、电子、医学等领域展示出良好、实质的应用前景。纳米TiO_2是一种氧化能力强、无毒无害、反应速度快、降Strong magnets解效率较高、无二次污染的新型光催化剂,因其优异的光学性能、催化性能和光电转换性能,引起人们极大关注。其中,TiO_2纳米管具有更大的比表面积,在光催化降解大气和水中的污染物、清洁能源等方面有广阔的应用前景。

 本文研究的微波合成法是利用微波对水的介电作用进行合成,是一种新型合成纳米管的方法,其合成机理尚不明确,且存在很多争议。与传统方法相比,微波法具有反应灵敏、加热速度快、受热体系均匀等优点。但现阶段而言,国内外对其报道极少,对掺杂TiO_2纳米管的微波法制备及光催化性能研究更是少有提及。

 本文利用溶胶-凝胶法制备了镧掺杂纳米粉,并且以纳米粉为前驱物,利用微波制备了稀土镧掺杂的TiO_2纳米管,同时对它们进行光催化性能对比。利用场发射扫描电子显微镜、透射电子显微镜、比表面仪、荧光光谱仪和X射线衍射仪等对试样形貌、结构和组成进行表征,并对其形成机理进行分析。

 结果表明:利用溶胶-凝胶法制备的作为前驱物的TiO_2纳米粉体粒径在40~60nm之间,掺杂使纳米粉体的颗粒形状更不规则,其颗粒表面更加粗糙,导致比表面积增加。利用微波法以TiO_2纳米粉为前驱物,可以制得形http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php貌比较完整的TiO_2纳米管,掺杂镧的TiO_2纳米管外径约为8~20nm,内径约为6~18nm,长约50~100nm;未经HCl酸洗的TiO_2纳米管在电镜下非常完整,而经过HCl酸洗的TiO_2纳米管在电镜下观察则发现其局部遭到破坏。TiO_2纳米管的形成可用纳米粉体在微波和NaOH的共同作用下首先解离为TiO_2纳米薄片,TiO_2纳米薄片经卷曲形成纳米管进行解释。

 以甲基橙为目标降解物,研究了锐钛矿型纳米TiO_2的光催化性能。纳米TiO_2试样在15W紫外光源照射下,经150min光催化降解试验,结果表明:TiO_2纳米管比纳米粉具有更好的光催化性能;镧掺杂TiO_2纳米管存在一个合理掺杂量,本试验条件下的最佳掺杂量为0.5%,其降解率可达到55.28%。

 本研究通过稀土元素掺杂TiO_2纳米管进一步提高了纳米TiO_2光催化性能,为其在诸多领域得到广泛而又实质性应用提供了一种新的途径。
学位年度:2010

内蒙古赤峰市金蟾山金矿床成矿机制与成矿构造背景研究

题名:内蒙古赤峰市金蟾山金矿床成矿机制与成矿构造背景研究
作者:彭丽娜
学位授予单位:中国地质大学
关键词:金蟾山金矿;;埃达克质岩;;矿床机制;;伸展背景
摘要:

 金蟾山金矿床位于华北克拉通北缘东段赤峰-朝阳金矿化集中区。区域内主要出露太古界建平群及元古界明安山群变质岩；中生界中侏罗系至白垩系砂砾岩、火山碎屑岩及凝灰岩；以及新生界上第三系和第四系地层。研究区海西-燕山期岩浆活动强烈,并以中酸性岩类为主,各类脉岩广泛发育。东西向深大断裂和北东、北北东向断隆断陷带控制了区内岩浆岩和矿床的分布。区内金矿点近百处,已开采的金矿rare earth magnets床十几处。

 矿区出露地层主要为晚太古代建平群、元古宙明安山群变质岩以及第四系沉积物。区内岩浆岩主要为安家营子花岗岩,后期发育大量脉岩,以流纹斑岩最为发育。控矿构造为一系列北东-北北东向平行侧列产出的断裂。矿体呈脉状产于断裂构造中,产状与断裂一致。矿石矿物主要有黄铁矿、黄铜矿、方铅矿、闪锌矿、磁黄铁矿等,金矿物主要为银金矿,其次为自然金和金银矿。脉石矿物以石英为主,其次为绿泥石、绢云母、钾长石、高岭土及碳酸盐等。矿石结构主要有自形-半自形、他形粒状结构、包含结构、交代结构以及碎裂结构等。构造类型主要有块状、斑杂状、浸染状、细脉浸染状、细脉-网脉状及条带状构造等。围岩蚀变发育,主要有钾长石化、绢云母化、绿泥石化、硅化、黄铁矿化、碳酸盐化等。该矿床可以划分为内生期和表生期两个成矿期,内生期又可进一步分为石英—黄铁矿阶段、多金属硫化物阶段和石英-黄铁矿-碳酸盐三个成矿阶段。

 与成矿密切相关的安家营子花岗岩SiO2含量为60.70%～68.01%,MgO 0.41%～2.44%；具高Al2O3≥15%和Sr(488×10-6～686×10-6)、低Y(9.04×10-6～18.60×10-6)和Yb(0.84×10-6～1.76×10-6)特点,富集轻稀土、亏损重稀土(La/Yb) N=17.62-56.11)和高场强元素及弱的负Eu异常等,与中国东部埃达克质岩的地球化学特征相似。主要氧化物Harker图解及主微量元素Al2O3 (SiO2)/CaO-Na2O/CaO、Ce/Rb-La/Rb等协变图解具有良好的线性演化关系,指示岩浆源区可能存在混合作用；这与花岗岩中含椭球状暗色包体、且包体中含花岗岩成分,镜下观察见花岗岩中黑云母斑晶含长针状磷灰石、角闪石斑晶中包裹黑云母、长石具有反环带以及暗色包体内含钾长石大斑晶等组成所揭示的岩浆混合信息一致。全岩ISr(t)变化于0.7055～0.7060、εNd(t)为-8.19,同位素组成具沿地http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php幔演化线分布特点；铅同位素组成206Pb/204Pb=17.194-17.288,207Pb/204Pb=15.340-15.391, 208Pb/204Pb=37.243-37.392,构造模式图解显示其主要位于下地壳和地幔演化线之间或地幔与造山带演化线之间,线性分布特点明显,共同表明安家营子花岗岩具壳幔混合特征。综合岩相学、主微量元素地球化学及同位素地球化学结果可知：岩石成因与俯冲板片的部分熔融、玄武质岩浆的地壳混染与分离结晶过程(AFC)以及拆沉榴辉岩相下地壳的部分熔融熔融模式相区别,而其源区过程可能为底侵高温岩浆促使早期底侵形成的玄武质下地壳和/或古老下地壳部分熔融,两者混合形成埃达克质熔体。定量模型计算表明,安家营子花岗岩演化过程中斜长石和黑云母、锆石等矿物的分离结晶对微量元素的变化产生了显著影响。

 矿石石英流体包裹体的H-O同位素δ18O水=2.1‰～8.4‰、δD水为-96.5‰～-80‰,方解石δ180水为-7.5‰～8.3‰,δD水介于-102‰～54‰,表明金蟾山金矿床成矿流体主要为岩浆水,后期有大气降水的混合。黄铁矿、黄铜矿、闪锌矿的S同位素δ34S值为-2.6‰～+7.6‰,峰值0‰～+1‰,均值+1.6‰,塔式效应明显,具岩浆硫特点。Pb同位素206Pb/204Pb=17.088-17.591、207Pb/204Pb=15.367-15.578、208Pb/204Pb=37.167-38.091,与安家营子岩体铅同位素组成一致,表明成矿物质来源于深源岩浆。以上同位素结果均表明金成矿与安家营子花岗岩具有密切的成因联系。石英流体包裹体的均一温度为220～380℃,盐度为4.0～40.1ω(NaCl)%,流体包裹体密度集中于0.66～0.87g/cm3,压力和深度估算分别为21.16～34.19Mpa、0.80～1.29 km,属浅成成矿环境。由包裹体气液相成分可知金蟾山金矿床成矿流体属H2O-CO2-KCl-NaCl型,金以硫化物络合物迁移为主。以下两种机制可导致金的沉淀：(1)深部高温成矿流体与大气降水混合,流体冷却,引起金硫络合物平衡的破坏,是金沉淀的主要机理；(2)含矿流体沿破碎带迁移过程中,水岩反应和成矿流体中Fe2+、Zn2+、Pb2+等的沉淀,导致pH、fO2和硫的总浓度的降低,引起金硫络合物平衡的破坏,导致金沉淀。

 金蟾山金矿床直接的赋矿围岩安家营子花岗岩锆石U-Pb年龄为132±5Ma,矿田内广泛发育的流纹斑岩脉大部分与金矿脉、矿化蚀变带平行分布,局部可见其侵入到矿化蚀变带中,侵位时代比金矿化时代略晚或同期,其锆石U-Pb年龄为124.9～126.5Ma,从而将金矿成矿时代限定在132～126Ma之间,属燕山晚期。这一时期与中国东部岩石圈减薄、剧烈的岩浆活动及成矿大爆发等地质事件相吻合,表明金蟾山金矿床与我国胶东、小秦岭等地金矿床类似,是深部岩石圈破坏的成矿响应。安家营子花岗岩携带的深部成矿物质沿北北东向(红山-八里罕?)断裂上升侵位,岩浆期后成矿热液充填于北东、北北东向断裂中,形成了金蟾山主要工业矿体。
学位年度:2010

西藏革吉县尕尔穷矽卡岩型铜金矿成矿岩浆岩特征及其含矿性研究

题名:西藏革吉县尕尔穷矽卡岩型铜金矿成矿岩浆岩特征及其含矿性研究
作者:姚晓峰
学位授予单位:成都理工大学
关键词:西藏;;尕尔穷铜金矿;;斑岩;;含矿性
摘要:

 尕尔穷矿区属于冈底斯-念青唐古拉板片与南羌塘-三江复合板片缝合带西段,位于狮泉河晚燕山期结合带与冈底斯-念青唐古拉板片两大构造单元的交汇处。矿区地层为白垩系则弄群多爱组碳酸盐岩和火山碎屑岩,主要出露的侵入岩为燕山晚期的石英闪长岩、花岗斑岩和闪长玢岩等。矿区主矿体位于3-0-16线之间,呈北西走向,倾向北东,在走向上长大于900m,沿倾向方向延伸大于400米。矿体产于多爱组碳酸盐岩与石英闪长岩的接触带中,主要呈似层状和透镜状产出,其形态受岩体外接触带构造所控制。Neodymium Magnets矿区有用元素以铜和金为主,矿石矿物以黄铜矿、斑铜矿和自然金为主,脉石矿物以矽卡岩矿物为主。矿石结构以结晶作用、交代作用和固溶体分离结构为主,矿石构造以稀疏浸染状和细脉状构造为主。通过研究矿石组构和矿物组合特征,石英闪长岩和花岗斑岩两次侵位分别存在有岩浆期、矽卡岩期和热液期。

 通过研究岩体的空间分布、形态和产状,岩石学、岩石化学和岩石地球化学特征,认为矽卡岩矿体的成矿母岩为石英闪长岩,提出花岗斑岩具有一定的成矿潜力。石英闪长岩和花岗斑岩属于钙碱性-高钾钙碱性的位于偏铝质和过铝质之间的过渡型花岗岩系列,具有铕弱负异常、轻稀土富集特征的稀土配分型式,具有富集大离子不相容元素Rb、K、Sr和亏损Th、Ta、Nb、Ti等高场强元素的微量元素地球化http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets学特征。在总结不同类型岩体的含矿性评价思路及评价手段的基础上,建立矽卡岩型矿床成矿母岩的含矿性评价准则,从宏观到微观以区域地球化学块体、矿区岩石和矿物三个层次为主要的评价体系,各层次的含矿标志作为主要的研究内容。通过微量元素地球化学标志、岩石标志及矿物标志三方面指示岩体具有较好的含矿性,并预测矿区具有形成斑岩型矿床的潜力。
学位年度:2010

高强高导Cu-Cr-Zr-Mg-Si合金时效特性研究

题名:高强高导Cu-Cr-Zr-Mg-Si合金时效特性研究
作者:敖学文
学位授予单位:南昌大学
关键词:高强高导;;Cu-Cr-Zr-Mg-Si合金;;稀土钇;;二级变形时效;;组织;;性能
摘要:

 铜合金由于其优异的导热、导电性能和一定的强度,因而在国民工业中应用越来越广泛,而随着工业技术的发展,制备性能更优异的铜合金也成为了一个重要研究方向。对于高强度高电导性铜合金来说,时效强化型的Cu-Cr-Zr系合金具有其一些特有的优势而备受青睐,因而与之相关的制备方法、工艺也不断推陈出新。本文分别对三种不同成分Cu-Cr-Zr-Mg-Si合金时效特性进行了研究,分析了不同工艺参数和成分对Neodymium Magnets合金组织与性能的影响,得出的主要结论如下：

 (1) Cu-Cr-Zr-Mg-Si合金在80%变形后480℃时效时可获得较好的综合性能,而在540℃时效30min后,合金发生过时效。升高温度和增大变形量加速合金的时效析出过程,随温度升高合金的导电性能有所提高；适当的加大变形量有助于提升合金的显微硬度,而对电导率影响不大。

 (2)在总变形量相同的情况下,通过二级变形时效工艺能提高Cu-Cr-Zr-Mg-Si合金的综合性能。显微硬度要比一级变形时效工艺提高6%-9%,电导率较之一级变形时效工艺也有所提高,可达88%IACS。

 (3)含量1.0%Cr的合金固溶后晶粒更细小,且时效后峰值硬度要高出0.6%Cr合金10-15HV,在不过时效时的整体硬度都要高于含量0.6%Cr的合金,而电导率要稍低于0,6%Cr合金。

 (4)Cu-0.6Cr-0.15Zr-0.05Mg-0.02Si添加了少量稀土Y后合金的组织得到改善,且对合金的硬度提升很大。且添加稀土Y推迟了硬度峰值出现的时间,并且使合金中的析出相更细小,析出相分布更弥散,硬度峰值可达174HV,而电导率稍有下降,但时效一小时之后均达到82%IACS以上。

 (5) Cu-Cr-Zr-Mg-Si合金经http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets变形时效处理后在扫描电镜下可以看到在晶内有着球形和棒状的析出相颗粒,经能谱分析确定为Cr颗粒和Cr的碳化物。

 (6)TEM观察发现,二级变形时效工艺合金中的析出相很小,粒径为2nm左右,且分布均匀,如此细小的析出相粒子对位错运动有强烈的阻碍作用,同时会造成位错的增殖。

 (7)观察合金变形时效处理后的拉伸断口形貌,可以看出其是典型的韧窝断口形貌特征,且将断口形貌放大后并没有观察到夹杂物或者第二相粒子,说明这些析出粒子很细小且合金内部组织较好。
学位年度:2010

Gansu Party Nan Shan Early Paleozoic tectonic nature of the study

Title: Gansu Party Nan Shan Early Paleozoic tectonic nature of the studyAuthor: Luo non-Degree-granting units: Chengdu University of TechnologyKey words: Early Paleozoic;; party Nan Shan;; volcanic rocks;; tectonic settingSummary:

Party Nan Shan in the Mongolian Autonomous County, Gansu Province, Salt Wanxiang Subei area.

Party developed a set of Mountain area in Henan early Paleozoic strata. Formation from the old to the new force were my groove group (O1-2WL), Salt Pond Bay Group (O2yc), Cardoso music group (O3ds) and Silurian Baron Gong Gaer group (Sbl). Force early in the Austrian Taoshi Wu groove group (O1-2WL) developed three lithologic, were I a power base in the basic volcanic rock groove, groove base edge, Sec I in acidic volcanic rocks, and I force Magnetic lifter ditch crystalline limestone group of three sections . One section of rock in the mafic volcanic breccia mass angular porphyry lava, lava rock spilite breccia, basaltic lava breccia, amygdaloidal basalt, massive basalt, spilite. Both tholeiitic rocks have calc-alkaline basalt series series. Acidic volcanic rock segment andesitic porphyry as, Shiying An Shan porphyry, times Shiying An Mountain porphyry. Dominated by calc-alkaline series. Constant element content and similar mafic sections. Trace element characteristics of rare earth, rare earth, low total, ΣREE39.29 ~ 1205.41μg / g, LREE / HREE = 3.42 ~ 10.51, with weak to moderate positive Eu anomalies, for the trace elements Sr, Rb, Ba, Th of selective enrichment, which is strongly enriched in Th, depleted Nb, Zr, Ti, Y, Yb, with the characteristics of island arc volcanic rocks. In the chemical composition and evolution of mafic volcanic rocks with the relationship. I force ditch Group volcanic rocks generally reflect the ocean environment and the oceanic crust on the development of ocean island volcanic arc.

Salt Pond Bay, Middle Ordovician volcanic rocks, lithology is mainly dark green to muddy siltstone, feldspathic quartz greywacke, siltstone sand quality feldspar quartz, feldspar greywacke, quartz sericite phyllite, etc. development of graded bedding. Rock composition in the mixed base and high content of calcium debris, composition and structure http://www.999magnet.com/products/131-magnetic-lifter of low maturity. A second deep - deep-sea and deep-sea mud with turbidite flysch portfolio construction, reflecting the formation of the continental slope to the abyssal plain in the transition of sedimentary environment.

Late Ordovician Cardoso music group containing sandstone and volcanic rock. Cardoso song still has a constant element volcanic rocks of oceanic tholeiite characteristics. With the South Qilian Late Ordovician volcanic rocks of the geochemical characteristics of volcanic rocks that Cardoso song is island-arc volcanic rocks, indicating the party Nan Shan exist Late Ordovician subduction.

Baron Gong Gaer Silurian rock group, the fine-grained sandstone from the lower part of the change, and change pebbly fine sandstone, siltstone sand change, change calcareous lithic sandstone, lithic sandstone, silty slate, sericite slate, chlorite slate, consisting of deep-sea flysch construction phase and the upper conglomerate, sandstone and other coarse clastic rocks of the sea - continental molasse formed. Space with north to south transition to shallow deep dustpan-like features, showing the typical characteristics of foreland basin deposits, reflecting the Silurian period of mountain areas in Henan Party ocean basin closure to continental collision stage.

The area is divided into two granite, the first phase of Cambrian - Ordovician I-type granite and adakitic rocks, the main formation period in 492 ~ 442Ma, the existence of the party responded to the Ordovician period, the South Qilian Mountain area in Henan Ocean northward subduction process. The second period of the Devonian period, IS-type granite, form the period 429 ~ 381Ma, should Qilian plate subduction. Development within the region also have 365Ma mafic dikes, on behalf of the formation of orogenic uplift, extensional stage.

According to the rocks during the formation of tectonic features of the environment, the establishment of the party Nan Shan Early Paleozoic tectonic evolution of the modes: ① early Austrian Tao Shinan Qilian ocean diving by the extensional environment to environment, in the oceanic crust formed on the basis of the intra-oceanic arc volcanic rocks, and accompanied by the Qilian belt I-type granite intrusion; ② Middle Ordovician tectonic movements had existed a quiet period, so the party to form a mountain area in Henan deep - half the deep sea turbidite flysch; ③ late Austrian Tao Shinan Qilian ocean again massive dive, and the party Nan Shan - Lajishan - fog places Hill line formed trench-arc-basin system; ④ Early Silurian at the beginning of the South Qilian ocean basin off the party Nan Shan region into the collision orogenic process, the ultimate Yu Zhi stay Fold the end of the collision orogenic century, has continued to Early - Middle Devonian, since the Late Paleozoic tectonic development of land within the new period.Degree Year: 2010

Jinchuan copper-nickel deposit characteristics of platinum group elements

Title: Jinchuan copper-nickel deposit characteristics of platinum group elements Author: Xu Gang Degree-granting units: Chang'an University Keywords: Jinchuan;; magmatic Ni-Cu-PGE sulfide deposits;; PGE;; ore causes Summary:

Jinchuan copper-nickel sulfide deposits in the deposit has a special status in recent years, many domestic and foreign geologists be a lot of research. In this paper, a systematic review and extract information based on previous geological, geology through field observation, systematic sampling, indoor light, thin, and identification of mineralogy petrology, Magnetic lifter geochemistry and PGE geochemical aspects of the research system , made the following main knowledge:

(1) Ⅰ, Ⅱ No. rock is similar to the PGE distribution pattern, with the major elements, rare earth elements and other geochemical characteristics of trace information displayed consistent, show that both have the same parent magma composition for the comagmatic evolution of the product.

(2) Jinchuan Ⅰ, Ⅱ No. rock rock and ore have similar PGE distribution patterns (Pt-Pd partition type), PPGE clear differentiation with IPGE to PPGE (Pt, Pd)-based, IPGE (Ir, Os, Ru, Rh) at low levels.

(3) PGE ore characteristics further evidence of the Jinchuan Cheng high-Mg magma tholeiitic magma. Deposits of rock and ore in Jinchuan Cu / Pd, Ni / Ir ratio (rock 42.59 × 103,7.87 × 105; ore 152.71 × 103,3.62 × 106) is much higher than the primitive mantle of Cu / Pd, Ni / Ir (7.7 × 103; 6.12 × 105) ratio (McDonough and Sun, 1995) These features indicate that the original magma in the magma chamber that existed before the invasion of a small amount of sulfide liquation. Initially obtained by further simulation about 0.013% of early onset pre-sulfide melt away.

(4) Major, trace rare earth and platinum group elements display the same characteristics of olivine, pyroxene and chromite in order to facilitate the magma fractional crystallization of sulfide melt saturation occurs from providing good conditions; partial http://www.999magnet.com/products/131-magnetic-lifter melting low level of Jinchuan copper-nickel deposit should not be reason for loss of PGE, and a small amount of sulfides from the pre-melting is caused by loss of the Jinchuan PGE magma main controlling factor.

(5) causes massive ore through simulation, that massive ore mainly from 10% to 40% fractional crystallization of MSS cooling after the formation of the consolidation, which with its relatively rich and poor PPGE IPGE characteristics consistent; rich Cu, Pt and Pd-rich massive ore and the special ore veins may be related to enrichment of solid solution crystals separated Cu, Pt and Pd in ​​the residual sulfide melt consolidation formation. Degree Year: 2010

New Nd ~ (3 +) doped inorganic near-infrared light-emitting materials, preparation and luminescent properties

Title: New Nd ~ (3 +) doped inorganic near-infrared light-emitting materials, preparation and luminescent properties Author: Wan Chui Ming Degree-granting unit: Jinan University Keywords: near-infrared light;; energy transfer;; phosphor;; Ca_2BO_3Cl;; alkaline earth chloride silicate;; compound phosphate Summary: Nd3 +-doped rare-earth near-infrared light with a large penetration depth, line width, background and other characteristics, such as markers in biological analysis has important application prospect. The major bottleneck in the application of its relatively weak near-infrared light intensity. By sensitized Nd3 + ions and energy transfer between near-infrared light to increase its strength in important ways. Eu2 + has the 4f → 5d electric dipole allowed transitions, can efficiently absorb the excitation light energy, and may transfer energy to the Nd3 + ion and sensitized luminescence. Magnetic lifter This commitment to research Eu2 + sensitization of new and efficient near-infrared Nd3 +-doped Eu2 + luminescent materials and to explore the near-infrared luminescence of Nd3 + energy transfer mechanism. Specific experiments are: High temperature solid phase prepared Ca2BO3Cl: Eu2 +, Nd3 + near-infrared light-emitting materials, the results show, Eu2 + incorporation can improve the Nd3 + near-infrared light intensity, Eu2 +, Nd3 + doping amount were 0.03,0.05, the near-infrared light the strongest. Proof of Eu2 + by non-radiation energy transfer to Nd3 + to effectively transfer the energy of the near-infrared Nd3 + have a good sensitization. High temperature solid phase prepared Ca3SiO4Cl2: Eu2 +, Nd3 +, Ca8Mg (SiO4) 4Cl2: Eu2 +, Nd3 + luminescence materials found Eu2 + on the near-infrared light-emitting Nd3 + exists sensitization. Studied the Eu2 +, Nd3 + doping concentration on the near-infrared luminescence properties and the variation of relative intensity. Examined the calcination temperature, calcination time on the near-infrared light-emitting properties. In Ca8Mg (SiO4) 4Cl2: Eu2 +, Nd3 + system, the sample of near-infrared emission intensity of Eu2 + doped with increasing concentration of the first enhanced and then decreased, Eu2 + doping amount of 0.08, the strongest near-infrared light; Nd3 + doping concentration of 0.10, the strongest near-infrared light. Sample calcination temperature of 1100 ℃ in the calcined 3h, the strongest near-infrared light. Analysis of the Eu2 + and Nd3 + between the energy transfer mechanism: Eu2 + with 4f → 5d transition track, can effectively absorb the energy, and energy transfer to Nd3 + energy levels, the occurrence of energy transfer, enhanced Nd3 + near-infrared light. High temperature solid phase prepared Sr4Si3O8Cl4: 0.08Eu2 +, 0.08Nd3 + light-emitting materials and found that the system of Eu2 + to the Nd3 + near-infrared light exists sensitization, near-infrared luminescence intensity increased by 10 http://www.999magnet.com/products/131-magnetic-lifter times, Eu2 + to Nd3 + energy transfer efficiency of 19.7%. Studied the Ca, Mg-doped Sr4Si3O8Cl4: 0.08Eu2 +, 0.08Nd3 + series light-emitting materials, with the Ca content increases, the sample of near-infrared light show a gradual increase trend. Samples of near-infrared luminescence intensity increased with the Mg content showed a gradual weakening of the trend. Prepared by solid-phase LiSrPO4: Eu2 +, LiCaPO4: Eu2 +, KCaPO4: Eu2 +, NaCaPO4: Eu2 + series of highly efficient blue, green phosphor, the phosphor to optimize the preparation conditions. Among them, studies have shown that LiSrPO4: Eu2 + doping amount of change as there are different luminescence centers; LiCaPO4: Eu2 + is a new and efficient blue phosphor; a small amount of Y3 + doping can improve KCaPO4: Eu2 + phosphor luminescence intensity. Further study of the LiSrPO4: Eu2 +, Nd3 +, LiCaPO4: Eu2 +, Nd3 +, KCaPO4: Eu2 +, Nd3 +, NaCaPO4: Eu2 +, Nd3 + near-infrared light-emitting materials, influences of different Eu2 + emission wavelength of the Nd3 + near-infrared light-sensitized effect; systematic study the calcination temperature, calcination time, doping and other factors on the NaCaP04: Eu2 +, Nd3 + system, the impact of near-infrared light-emitting materials, analysis of the ABP04 system Eu2 +-Nd3 + energy transfer mechanism between. Degree Year: 2010

metal complexes of chitosan and its derivatives, the synthesis, characterization and antibacterial properties of cancer

Title: metal complexes of chitosan and its derivatives, the synthesis, characterization and antibacterial properties of cancer
Author: Yang Zifang
Degree-granting units: Shanghai Normal University
Keywords: rare earth;; chitosan;; complexes;; antibacterial agent;; cancer
Summary:
In this paper, chitosan and its derivatives and rare earth and transition metal salts of nitrate as raw materials, the use of reflux condensation and precipitation, a series of new synthesized chitosan and its derivatives, metal complexes CTS / RE (RE = La3, Ce3, Ce4 Pr3, Nd3, Sm3, Eu3, Y3, Er3, Gd3; CTS of chitosan and its derivatives), and by infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray powder diffraction, X-ray energy spectroscopy, Raman spectroscopy, thermogravimetric - differential thermal analysis, transmission electron microscopy, scanning electron microscopy and fluorescence spectra of the complexes of the composition, structure and Strong magnets properties were analyzed. Thermogravimetry - differential thermal analysis results show that the synthesized complexes have better thermal stability. SEM photographs obtained through the analysis of the new complexes are synthesized nanoparticles.
Diffusion method using medium, nutrient broth dilution method, foil method and aging test method for metal complexes of chitosan antibacterial properties, is a representative experiment with E. coli bacteria and Staphylococcus aureus. Antibacterial results show that the synthesized complexes on experiments with bacteria have a better inhibitory, are broad-spectrum antimicrobial agent, has good durability and long-lasting antimicrobial resistance, and glucose complexes against Staphylococcus aureus to antimicrobial capacity greater than the ability of E. coli bacterial. In addition, some complexes in vitro anticancer activity tests, experimental target cell is a human chronic http://www.chinamagnets.biz/ myelogenous leukemia K562 cells. Experiments were applied were inverted light microscope, fluorescent microscope and transmission electron microscopy of K562 cells and the role of the complex morphology of cells after the study, the use of MTT assay for cell viability testing, the use of flow cytometry after the complex role of the withered cell death rate. Experimental results show that the anti-tumor chitooligosaccharides cerium complexes on K562 cell growth and proliferation of tumor significantly inhibited, compared with the control group, significant differences in inhibition rate within a certain range increases with the dose increased.
Degree Year: 2010

solid acid catalyst and γ-butyrolactone benzene gas-solid phase synthesis of α-tetralone reaction

Title: solid acid catalyst and γ-butyrolactone benzene gas-solid phase synthesis of α-tetralone reaction Author: Wang deposited Degree-granting unit: Zhejiang University Keywords: FC reaction;; microporous molecular sieve;; γ-butyrolactone;; α-tetralone;; gas-solid reaction;; fixed-bed reactor Summary: α-tetralone is an important synthetic intermediates that can be used antidepressant Sertraline, different contraceptive norethindrone - ethinyl estradiol tablets ether, pesticides carbaryl, synthetic plastic softener. The existing literature shows that the air oxidation of tetralin, and benzene and γ-butyrolactone in AlCl_3 the catalyst to generate α-tetralone, but the air oxidation of tetralin conversion rate is low, AlCl_3 catalyst corrosion of equipment, pollution of the rare earth magnets environment and difficult to re-use and other issues, the reaction requires further green. In recent years, molecular sieve in acid-catalyzed FC reaction has been more attention. Zeolite is an important solid acid, has a certain acidity, rules and larger pore surface area, in the petrochemical, fine chemicals widely used synthetic field. May be needed, but the nature of the molecular sieve was modified to change its acidity and pore structure. Zeolite has a high thermal stability, high temperature burn off carbon deposits by means regeneration, reducing industrial costs. This paper mainly studies of benzene in a fixed bed reactor and the reaction of γ-butyrolactone, physical and chemical properties of the catalyst characterization system were compared, and discussed the acid-catalyzed reactions under the conditions of the law, proposed a possible reaction mechanism of micro- . Main contents and results are as follows: 1 impregnation method using an equal volume of the load to the ZnCl_2 γ-Al_2O_3 and activated carbon surface, the heteropoly acid H_3PW_ (12) O_ (40) load to the 7-Al_2O_3 surface, the gas-solid fixed bed reactor evaluation reactivity of the catalyst, the results showed that: ① 33.3% ZNCl_2/γ-Al_2O_3 and 33.3% ZnCl_2 / C on the gas-phase benzene and the reaction γ-butyrolactone with high catalytic activity, but 33.3% H_3PW_ (12) O_ (40) / γ-Al_2O_3 The catalytic reaction can not. ② 33.3% ZnCl_2/Al_2O_3 reaction at different temperatures showed that in the 300-360 ℃ range, γ-butyrolactone conversion rate was negatively correlated with temperature relationship. α-tetralone selectivity and yield is very low, the product, in addition to C benzene, 2 - D acid and α-tetralone there are more than 30% outside the product of the reaction mechanism is very complex. (2) of acidic zeolite and γ-butyrolactone benzene gas-solid reaction has a significant catalytic effect of zeolite catalysts results are quite different, but the main product is the C benzene (including benzene, cumene and n-propyl) , 2 - D acid and α-tetralone. Which HZSM5 Zeolite generated tetralone with high selectivity and stability, provides a synthesis of α-tetralone new method. Discussed in detail the reaction conditions on conversion, yield or selectivity, and possible reaction mechanism was proposed; In addition, HZSM5 (Si / Al = 50) of the hydrothermal treatment, heat treatment, phosphate and rare earth modified modified also carried out a more detailed examination. Main The results are: ① HZSM5 zeolite catalytic gas-phase benzene and γ-butyrolactone response to silica-alumina ratio Si / Al = 50 the best response to the results, HZSM5 (Si / Al = 50) occurred during the reaction inactivation, high temperature leads to burning or O_2 air to carbon can be regenerated catalyst regeneration that has good repeatability. ② modified phosphoric acid, water, heat treatment, heat treatment, and rare earth modified zeolites and other methods can improve the catalytic activity, while the product selectivity is not greatly affected. Modified heat treatment and heat treatment with http://www.chinamagnets.biz/ water to get a high activity and stability. ③ benzene and γ-butyrolactone gas-solid reaction of the possible reaction mechanism is: γ-butyrolactone first ring-opening reaction of benzene with 4-phenyl butyric acid, 4 - phenyl butyric acid intramolecular acylation reaction, cyclization to generate α-tetralone. Benzene and γ-butyrolactone gas-solid reaction mechanism may be ER. Generated during the reaction of propylene and 2 - crotonic aggregation may occur, leading to inactivation of the main molecular sieve. 3 were used NH_3-TPD, BET, XRD, and O_2-TG and other methods of acidic zeolites and modified zeolite characterization, the results showed that: ① different SiO2/Al2O3 of HZSM5 zeolite, silica-alumina greater than the smaller amount of acid. ② rare earth elements modified, high-temperature calcination, hydrothermal treatment and acid modification and other methods can reduce the total amount of acid zeolites HZSM5 and strong acid sites and the number of weak acid, but does not affect the HZSM5 zeolite surface phase structure. ③ HZSM5 (Si / Al = 50) before and after reaction and regeneration in the surface phase structure has not changed, indicating that inactivation is mainly due to molecular sieve product coke or coke. Degree Year: 2010

Infrared spectral characterization of materials

Title: Infrared spectral characterization of materials
Author: Yang Mingyue
Degree-granting unit: Changchun University of Technology
Key words: rare earth doped;; fluorescence spectroscopy;; fluorescence lifetime
Summary:
With the infrared optical glass doped with rare earth elements in the defense, medical, aerospace, equipment and other areas increasingly popular, the optical identification of the finished material to measure material properties for the pros and cons as well as new materials to the development of ideas has played a decisive role. Spectral characteristics of optical materials as rare earth magnets a measure of symbolic means, the fluorescence emission spectra as well as for the detection of the fluorescence lifetime of research and improvement of test methods is particularly important.
In this paper, the semiconductor laser diode as a pump light source, optical company with Zhuoli Han grating monochromator and photodetector match, in the various test results of samples than the latter summarizes some of the tests can interfere with the measurement results of factors. At last, conclusions built for doped Nd ~ (3) and Yb ~ (3) ions of the http://www.chinamagnets.biz/ glass and powder samples of 800m-1500mn band fluorescence emission spectra and fluorescence lifetime measurement system. After comparison with the literature that use this system the measured data to be authentic.
Degree Year: 2010

Inner Mongolia, Liu dam GOLD genesis and prospecting mineralogy mineralogy

Title: Inner Mongolia, Liu dam GOLD genesis and prospecting mineralogy mineralogy
Author: Zhang Yan
Degree-granting units: China University of Geosciences (Beijing)
Keywords: Genesis;; ore mineralogy;; mineral standard type;; metallogenic prognosis;; Liu dam ditch;; Inner Mongolia
Summary:
Willow Dam gold deposit in Inner Mongolia in the ditch margin of North China, is a typical K-feldspar with extensive development into an important feature of the gold deposit. In this paper, based on the analysis of geological conditions, through the quartz, feldspar and pyrite containing gold and other major causes of mineralogy and mineral prospecting system rare earth magnets mineralogical study of ore-forming hydrothermal sources and mineralization law, and deep mining exploration prospects were predicted.
Pyrite shows the thermoelectric coefficient are N-type conductivity type, formed mainly in the temperature of 310 ℃ ~ 330 ℃. Lattice parameters a0 value is between 0.54167 ~ 0.54214nm, slightly larger than the theoretical value. a0 value increases gradually with increasing depth, and a0 and the host rock of Au grade showed a positive correlation. Pyrite with a strong enrichment of Mo, Pb, a strong loss of Rb, Zr, Nb, Th and other elements of its main features. Pyrite low As, Se content of the standard-type gold deposits of the important features.
Thermal glow curves of quartz mainly a single peak and less Xu Shuangfeng characterized integral intensity is low. Temperature range of heat-emitting T1 (160 ~ 220 ℃) ​​and T2 (220 ~ 280 ℃), and the T2 interval-based. Quartz cell slightly larger than the theoretical value of the parameter values, decreases with elevation above sea level, the cell parameters have corresponding degree of reduction. Quartz was enriched Mo, Pb, As, Sr, Ba and other elements, including Mo + Pb + As content and Au was positively correlated with the relationship. Higher levels of Sr and Ba ore-forming fluids and the rock show had a strong K-feldspar and water-rock interactions.
K-feldspar are in between feldspar and feldspar between the largest or the largest feldspar, potassium feldspar Liu dam ditch ditch a higher degree of order Bi Hada door. Liu dam close to the ditch and K-feldspar mineralization Or is 92.2% ~ 96.2%, Ab 3.8% to 7.8%, and Hada ditch near the same gate.
Closely related to Au mineralization of three of the minerals (pyrite, quartz, feldspar) the basic characteristics of rare earth elements are shown as a http://www.chinamagnets.biz/ very significant positive Eu anomaly, gently inclined to the right type of light REE enrichment, indicating fluid is high, relative reduction characteristics. Their REE patterns with large birch back granite veins are very similar, inferred magmatic hydrothermal mineralization played an important role for the ore-forming hydrothermal type gold deposits in high temperature, K-feldspar enrichment of Au mineralization played an important role.
By pyrite, quartz and potassium feldspar characteristics of the standard model, suggesting that the mining area in the east for the next 313 Vein key areas of exploration, ore body has been exposed at or near the location with alkali account, with account of the upper part of the hydrogen and silicified zone, have already suffered some degree of erosion, the door of the Bi Hada ditch mine geological conditions, that the deep to find this account possibility of altered rock type gold great.
Degree Year: 2010

Shandong Rushan gold England village and the deep causes of long-term study of mineralogy

Title: Shandong Rushan gold England village and the deep causes of long-term study of mineralogy
　　Author: Zhou Qifeng
　　Degree-granting units: China University of Geosciences (Beijing)
　　Keywords: Genesis;; genesis;; England Village gold;; Jiaodong
　　Summary:
　　England village in the Jiaodong gold Muping - Rushan gold mineralization belt in the southern, output in the Jingshan Group and Kunyushan igneous contact zone, the yellow iron ore quartz vein type gold deposits. This includes four gold veins, the main ore body by the NNE-trending faults control Jinniushan average gold grade of 4.32 × 10-6.
　　Ore types with quartz and pyrite polymetallic sulfide ore based. Mineral composition of ores and other metal sulfide minerals pyrite, quartz and carbonate minerals. Ore structure to granular structure of the main structure and fragmentation, ore massive structure constructed, disseminated and vein-like structure constructed based. Gold minerals include gold and Neodymium magnets silver gold and silver mines, to wrap gold, gold intergranular fracture as the main gold occurrence form. Pyrite mineralization is divided into British, quartz, pyrite, sulphides and quartz carbonate four stages. Wall-rock alteration types include K-feldspar, albitization, sericitization, phyllic alteration, silicification, pyritization, and chloritization of carbonate rocks.
　　Pyrite crystal in this area to its pentagonal dodecahedron and the octahedron and the cube-shaped poly mainly from shallow to deep, from early stage to the main ore-forming stage, poly-shaped crystal growth and crystal deformation complex, indicating that the system sulfur fugacity increases, the temperature is relatively higher. Major element composition analysis results for the overall poor pyrite sulfur, hydrothermal pyrite in the main. Trace element analysis reveals England village to magmatic-hydrothermal ore-forming hydrothermal-based, early stage of ore formation in the role of the old rock. Geochemical analysis of pyrite REE patterns for the right-wing type, the main ore stage pyrite REE patterns are basically the same. Thermal coefficient of pyrite range -346.1 ~ 342.7μν / ℃, thermal conductivity for the P-type multi-mixed with N-type, P-type occurrence rate averaged 64%. South, North, P-type wells pyrite deposits that occur south of the relative uplift rate. P-and N-type pyrite crystallization temperature is 148.9 ℃, respectively, the mean and 349.1 ℃. According to the P-type region of occurrence of pyrite and gold grade changes consistency, suggesting that I, P-type ore bodies http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php occur from south to north the rate of the deep depression, II-1 and II-3 ore ore-forming deep good prospects.
　　Stable isotopes of ore minerals in this area (He, Pb, and S) analysis showed that the shell-forming fluids is the main source of the crust-mantle mixing fluids, into minerals mainly from the lower crust and a small amount of mantle-derived material, and a rock Jingshan Group formation of the join. HO isotope analysis showed that the quartz ore-forming fluids of magmatic water and meteoric water mixed fluid. Analysis of fluid inclusions in quartz test that England village into a gold mine for the low temperature in the low salinity shallow hydrothermal gold ore-forming fluids in general are Na + (K +) - (Ca2 +)-Cl-(SO42-) type, gas dominated by gas water composition, followed by CO2, H2 and a small amount of CO, CH4, and N2, the main ore-forming fluid phase as a weak acid, was to restore nature.
　　Degree Year: 2010

Heilongjiang Province, Jinchang gold rock mineralogy and genesis of gold deposits

Title: Heilongjiang Province, Jinchang gold rock mineralogy and genesis of gold deposits
　　Author: Lee slope
　　Degree-granting units: China University of Geosciences (Beijing)
　　Keywords: Gold Factory Gold;; magmatic rocks;; pyrite;; ore-forming fluid
　　Summary:
　　East County in Heilongjiang Jinchang gold deposit is located north of the eastern end of the orogenic belt Songnen land is guitar black lava fields forming an important part. The deposit is a typical porphyry-type gold deposits, characteristic of its wall-rock alteration, mineralization type of comparison and determination of regional metallogenic deep exploration has important theoretical and practical significance. This paper from the characteristics of igneous rocks, 18 ore and Neodymium magnets alteration mineralogy petrology, ore geology, ore-forming fluid geochemistry, genesis and prospecting in areas such as research work, mainly to obtain the following results:
　　① No. 18 ore body through the granite rocks ore mineralogy, petrology and geochemistry of chemical research, found that late Indosinian granitoid rocks rich in Fe, Na2O/K2O, DI <90, Fm is 0.65-0.85, Eu loss not strong, δEu> 0.3, La / Yb> 10, is conducive to the formation of the gold mark. Granitoid rocks of the area of ​​trace elements, isotope studies showed that: granite rocks as magma sources under the crust, mantle-derived substances are mixed.
　　② alteration of this area Indosinian granitoid rocks rock chemical analysis, analysis of REE and trace elements analysis. Analysis of test data through comprehensive research and water-rock reactions element migration calculations, ore-forming fluid in the water-rock reactions showed a relatively strong activity, quantitatively confirmed silicification, and potassium-based payment the close relationship between ore mineralization. SiO2, K2O, H2O is the gold migration and deposition of the main media.
　　③ by infrared spectroscopy and X-ray powder diffraction analysis of hydrothermal alteration phase of K-feldspar as the rock strength to increase their degree of order is gradually increased degree of order and close the fluid, there is a certain positive correlation. The final structure of K-feldspar gold plant temperature 400-420 ℃, suggesting they may be the http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php product of hydrothermal alteration.
　　④ According to the gold plant in different stages of pyrite mineralization of trace elements and rare earth elements, indicating that ore-forming fluids from the region gold mines porphyry ore-forming fluid rich in Cl, F is characterized by poverty, a view into how superposition of ore fluids.
　　⑤ different mineralization stages of pyrite inclusions in pyrite He isotopes and Pb, S isotope geochemistry results show that the source of ore-forming fluid show characteristic shell, the shell source components mainly by lower ore body No. 18 granite plaques Rock offers, late in the mineralization may be a small amount of air mixed with water; based on 18 orebody ore granite rocks, minerals and trace elements and rare earth sulfide ore geochemical results further show that the main ore-forming fluids in this area from the crust, and the granite porphyry, granite porphyry in the role of magmatic-hydrothermal stage, multi-stage high-temperature hydrothermal involved in mineralization.
　　Degree Year: 2010

RE Al-10Mg alloy preparation and characterization

Title: RE Al-10Mg alloy preparation and characterization
　　Author: Yang Xiaopeng
　　Degree-granting unit: Changchun University of Technology
　　Keywords: Al-10Mg alloy;; extrusion;; microstructure;; mechanical properties
　　Summary:
　　Preparation of cast Al-10Mg and Al-10Mg-0.2La (Mg, La, wt.%) Alloy after extrusion and after extrusion to obtain a good bar and extruded sheet. Through the alloy microstructure analysis, X-ray diffraction analysis, analysis of tensile mechanical properties, hardness analysis, fracture analysis scanning, corrosion and wear performance analysis, studied the compressive deformation of the alloy structure and mechanical properties.
　　The results showed that: after solution treatment and after extrusion, the distribution along the grain boundaries most of the β phase to α-Al solid Neodymium magnets solution matrix. After extrusion alloy finer grain size, and the virtual elimination of left-cast alloy shrinkage, mechanical properties has been significantly improved. Extruded alloy deformed at room temperature Brinell hardness (HB) in excess of 80. The tensile strength of the cast alloy is about 280MPa, while the deformation of the alloy extruded at 350 ~ 390MPa tensile strength between the increase of about 25 ~ 39%, showing extrusion alloy with higher strength. Compared with cast alloy, extruded alloy after deformation the yield strength of 190MPa or so, increased by about 14%, showing extrusion alloy with excellent toughness. Elongation of the alloy after extrusion rate has improved significantly, indicating extrusion alloy with good ductility. Rare earth elements La addition on the mechanical properties of alloys is not http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php very obvious. Alloy fracture analysis showed that the fracture mode of the cast alloy mainly brittle fracture, and fracture mode of alloy extrusion for the ductile - brittle fracture mixed. In addition, the compressive deformation of the alloy has good corrosion resistance and wear resistance.
　　Degree Year: 2010

Eu (Ⅱ) or Eu (Ⅲ) to stimulate the synthesis of metaphosphate, light-emitting diode and its application in research

Title: Eu (Ⅱ) or Eu (Ⅲ) to stimulate the synthesis of metaphosphate, light-emitting diode and its application in researchAuthors: Feng Zhang LeiDegree-granting units: Sun Yat-senKeywords: semiconductor light-emitting diode;; high-temperature solid-phase method;; Y (PO_3) _3: xEu ~ (3);; BaCa (PO_3) _4;; Eu ~ (3)-doped red phosphors;; Eu ~ (2 );; Mn ~ (2) co-dopedSummary:

Since 1996, after the advent of the first white LED, because of its long life, energy saving, green lighting, and other significant advantages has been hailed as a new generation of lighting. However, as applied to ~ 400 nm near-ultraviolet - UV-chip three color Magnetic lifter phosphor mainly traditional phosphors, these traditional phosphors excited by near ultraviolet light efficiency is not high, and one of the green and red phosphors phosphors are sulfides, poor stability, in the process of preparation and use of the environment likely to cause pollution, making the white LED luminous efficiency and service life is not easy to improve. Therefore, the study of new InGaN-LED with a phosphor with important academic significance and practical application. The dissertation is to find suitable near-ultraviolet InGaN-based LED with a fluorescent transformational new, efficient, and stable phosphors were studied to be suitable for conversion near-ultraviolet InGaN-based white LED with a fluorescent rare-earth ion Eu (Ⅱ / Ⅲ) doped inorganic phosphors, and the use of XRD (X-ray diffraction characterization of its structure, a detailed study of their photoluminescence properties, and finally, better fluorescent properties of selected compounds in combination with the near-ultraviolet InGaN chips, made of LED, light of its performance of this dissertation is divided into six chapters written.

Chapter 1 introduces the development process of white light diode, an overview of current white LED with a phosphor research and outlines the status of rare earth luminescent materials progress Finally elaborated on the basis of the dissertation topics and research content.

Chapter 2, high-temperature solid-prepared Eu ~ (3) ion-doped series Y_ (1-x) Eu_x (PO_3) _3 (0 ≤ x ≤ 1) red phosphor, characterized by XRD and fluorescence spectroscopy and its structure fluorescence properties were characterized. The results show that 600 ℃ ~ 900 ℃ temperature range, are eligible for a single Y (PO_3) _3, Eu (PO_3) _3 pure phase, we choose the conditions 800 ℃ calcined samples obtained, a detailed study of its photoluminescence properties , the results obtained when x = 1 when its strongest light.

Chapter 3 high-temperature solid-prepared Eu ~ (3) ion-doped BaCa_ (1-x) (PO_3) _4: xEu ~ (3) series of phosphors, and their synthesis and characterization based on the Li-ion doped ion research, preparation series BaCa_ (0.9-x) Eu_ (0.1) Li_x (PO_3) _4 red phosphor, and XRD and fluorescence spectra and fluorescence properties of its structure were characterized. The results show that in the pure phase obtained under the premise, BaCa_ (1-x) (PO_3) _4: xEu ~ (3) phosphor Eu ~ (3) when the doping concentration of 0.10 the highest light intensity, when the Li ~ doping concentration of 0.15, the phosphor BaCa0.75Eu0.1Li0.15 (PO_3) _4 maximum luminous intensity, and the co-doped by Li ~, in charge of compensation, but also to enhance the luminescence intensity of phosphor.

Chapter 4, the weak reducing atmosphere using CO were prepared by high temperature solid Eu ~ (2), Mn ~ (2) doped series Ba_ (1-x) EuxCa (PO_3) _4, Ba_ (0.85) Eu_90.15) Ca_ ( 1-x) Mn_x (PO_3) _4 phosphor, and studied their photoluminescence properties. The results show that the doped Eu ~ (2) of the Ba_ (1-x) Eu_xCa (PO_3) _4 as a pure phase of the phosphor of the premise, in this system with the Eu ~ (2) ion doping concentration increased, luminous intensity is increasing, when the doping concentration of 0.15, the strongest, no significant change in http://www.999magnet.com/products/131-magnetic-lifter excitation spectra. In Ba_ (0.85) Eu_ (0.15) Ca_ (1-x) Mn_x (PO_3) _4 system, with Mn ~ (2) ion concentration increased, the occurrence of energy transfer.

Chapter 5 examined the preparation of phosphors in the near UV InGaN-based white LED applications. The resulting performance will be better prepared monochrome phosphors Eu (PO_3) _3, BaCa_ (0.9) (PO_3) _4: 0.1Eu ~ (3), BaCa_ (0.75) Eu_ (0.1) Li_ (0.15) (PO_3) _4, respectively, at ~ 395 nm chip production with red LED.

Chapter 6 summarizes the main work of this dissertation, and in accordance with the progress and shortcomings, near-UV excitation of the future conversion of rare-earth phosphor-based LED research with a brief outlook.Degree Year: 2010