Sn~（4+）、La~（3+）和Ce~（4+）掺杂氧化钛纳米薄膜湿敏性能的研究

题名:Sn~（4+）、La~（3+）和Ce~（4+）掺杂氧化钛纳米薄膜湿敏性能的研究
作者:刘红伟
学位授予单位:内蒙古工业大学
关键词:氧化钛;;薄膜;;离子掺杂;;稀土;;湿敏性能
摘要:
 本工作采用溶胶–凝胶法在印有梳状银电极的石英玻璃表面制备了纯氧化钛、TiO_2–20wt%SnO_2和La~(3+)/Ce~(4+)掺杂TiO_2–20wt%SnO_2的薄膜,在不同温度下烧结制得湿敏元件。利用智能LCR测量仪在不同湿度环境下对湿敏元件Magnetic lifter的阻抗、电容等参数进行测量,并对其湿敏性能进行分析,研究了Sn~(4+)、La~(3+)和Ce~(4+)离子掺杂量、烧结温度、工作频率、涂敷层数等对薄膜湿敏性能的影响,利用原子力显微镜对湿敏薄膜作表面形貌分析,分析了各离子掺杂对薄膜湿敏性能的影响。
 研究结果发现,在较低的工作频率和较低的烧结温度下,薄膜表现出较好的湿敏特性。随着测试频率的增大和烧结温度的升高,薄膜的湿敏性能变差。Sn~(4+)、La~(3+)和Ce4+掺杂后,薄膜的湿敏性能都比纯氧化钛http://www.999magnet.com/薄膜的湿敏性能好。而且稀土离子掺杂后,薄膜的固有阻值有所降低。
 TiO_2–20wt%SnO_2系薄膜中,湿敏性能最好的是400℃烧结的一层TiO_2–20wt%SnO_2薄膜,在25～95RH%范围内,阻抗值从10~9Ω下降到10~6Ω;La~(3+)掺杂TiO_2–20wt%SnO_2系薄膜中,湿敏性能最好的是0.5wt%La_2O_3掺杂400℃下烧结的薄Magnetic lifter膜,在45～95RH%湿度范围内,阻抗值从108?下降到10~6Ω;Ce~(3+)掺杂TiO_2–20wt%SnO_2系薄膜中,湿敏性能最好的是0.2wt%CeO_2掺杂500℃下烧结的薄膜,在25～95RH%湿度范围内,阻抗值从10~8Ω下降到10~6Ω。
 稀土离子掺杂导致薄膜湿敏性能下降的原因主要是由于它们在氧化钛晶界富集,阻碍了氧化钛晶体吸附水分子和水分子的电离。
学位年度:2009

稻城—香格里拉地区浅成花岗岩类地质地球化学特征及找矿意义

题名:稻城—香格里拉地区浅成花岗岩类地质地球化学特征及找矿意义
作者:王振中
学位授予单位:成都理工大学
关键词:稻城-香格里拉;;浅成花岗岩;;地球化学特征;;找矿意义
摘要:
 西南三江是我国重要的有色金属成矿带,铜、铅锌、银、金、锡等优势资源潜力巨大。四川稻城-香格里拉地区位处三江北段义敦岛弧带有色、贵金属矿成矿集中区南部,极其复杂多样的地质构造,造就了十分有利的成矿条件。通过该区广泛出露的浅成侵入岩系统的岩石学和地球化学研究,探讨其物质来源和形成过程,magnetic lifter对于研究该区找矿具有重要意义。
 在川西稻城县与滇东北香格里拉县交界地带,分布有一套浅成斑岩体,其形成时代为三叠纪。在三叠纪斑岩体中,已发现了普朗、雪鸡坪、松诺、卓玛等斑岩铜矿床,四川省境内仅发现红卓、拉郎等斑岩铜矿点。
 本人通过对川西-滇东北相邻地区斑岩体的对比研究,发现这些斑岩体呈南东-北西方向展布,空间上可以划分出三个斑岩带,即西带(雪鸡坪带)、中带(普朗带)和东带(卓玛-红卓带)。西带包括烂泥塘、雪鸡坪、春都、欧赛拉等斑岩体,岩性主magnetic lifter要为石英闪长玢岩,其次为闪长玢岩,少量石英二长斑岩;中带包括亚杂、浪都、地苏嘎、松诺,普朗等斑岩体,岩性以石英闪长玢岩为主,其次为石英二长斑岩,少量二长花岗斑岩;东带包括卓玛、红卓、那郎等斑岩体,岩性为闪长玢岩、石英闪长玢岩,少量石英二长斑岩。
 在岩石化学方面,研究区的三叠纪浅成斑岩为亚碱性系列,进一步的岩石化学判断,这些岩体主要属于钙碱性系列。总体上看,普朗岩体的SiO2含量更高,而红卓、拉郎地区斑岩体的SiO2含量较低,这与岩体中以闪长玢岩为主体是一致的。
 在微量元素方面,普朗、雪鸡坪岩体Ba和Sr的含量高,Y、Yb和Nb含量较低,在微量元素比值蛛网图上,岩体以富Ba和Sr以及强烈亏损Nb,微亏损Ta和Ti为特点。Nb和Ti的亏损代表一种岛弧岩浆岩的特征,Ba和Sr的富集,表明斜长石在岩浆源区不能稳定存在,岩浆起源深度大,相当于地幔深度的板块俯冲带或壳幔混合层。岩体表现为轻稀土富集型并伴有强烈的分馏作用,而重稀土元素含量低,且几乎不分馏,无Eu异常。岩体具有埃达克岩的地球化学特征。红卓、拉郎岩体,其Ba和Sr含量比普朗、雪鸡坪岩体低magnetic lifter,Y、Yb和Nb含量较低,在微量元素比值蛛网图上,以Ba、Th、U的富集,Nb、Ta、Sr、P、Ti的亏损为特征。Nb、Ta的亏损显示了岛弧环境的特点,Sr、P亏损表明存在一定量的地壳物质混染,Ba、U、Th的富集,暗示岩浆源区存在(深源)流体活动。Rb/Sr比值为0.03～0.1,显示为靠近幔源的壳幔混合层的特征。红卓-拉郎地区岩体的稀土元素特征类似于普朗、雪鸡坪地区的斑岩体,总体上看,岩体的微量元素与典型的埃达克岩有明显的差异。
 由于红卓-拉郎地区的斑岩体与普朗、雪鸡坪地区斑岩体在岩体蚀变、化学成分、岩浆起源与演化,岩体含矿性等方面存在巨大差异,暗示两者间的找矿潜力有所不同。
 作者提出,稻城-香格里拉地区以普朗、雪鸡坪magnetic lifter岩体为代表的斑岩带向东已延入四川省境内,但是,在四川省红卓、那郎等地区的三叠纪斑岩体中找到斑岩型铜矿床的希望不大。
学位年度:2009

扬子地区二叠系典型剖面层序地层分析及优质烃源岩判识

题名:扬子地区二叠系典型剖面层序地层分析及优质烃源岩判识
作者:李红敬
学位授予单位:中国地质大学
关键词:扬子地区;;二叠系;;层序地层;;海相优质烃源岩;;微量元素
摘要:
 在世界范围内,海相地层是一种非常重要的油气生储层,世界可采储量的61%都产自海相地层。相比之下,中国的海相地层占大陆沉积岩面积的40%,而在海相地层中的油气发现却相对很少。因此,中国海相碳酸盐岩地层应当具magnetic lifter有相当大的油气勘探潜力。前人的研究已经证实,二叠系是中国南方重要的海相烃源岩层。本论文以扬子地区二叠系三个典型剖面为解剖对象,以碳酸盐岩露头层序地层为理论指导,采用微量元素、碳氧同位素地球化学测试分析,结合野外实际考查和室内薄片观察,系统开展了二叠系典型剖面沉积相及层序地层研究,并探讨了层序构成基本特征。在层序地层分析及前人对本区生境型研究的基础上,结合残余有机碳测试,探讨扬子地区二叠系有机质富集规律,进而判识典型剖面优质烃源岩富存层位,并初步探讨了海相烃源岩的地球生物学判识方法,最后总结了研究区优质烃源magnetic lifter岩的发育模式。主要认识及成果:
 1、根据野外记录描述和室内薄片观察,对典型剖面二叠纪地层进行了沉积相的划分,总结了各沉积相的地球化学特征。Co、Ba、V、Rb等具有指相意义的元素,沉积相越靠近深水环境,Co、Ba、V、Rb平均丰度越大,而Sr/Ba值从台地相到盆地相整体有降低趋势。贵州罗甸剖面从台地前斜坡相→陆棚相→斜坡相→盆地相,REE值逐渐增大。贵州罗甸剖面各沉积相稀土元素配分模式存在明显的Ce异常。
 总结了广元地区、华蓥山地区和贵州罗甸地区碳酸盐岩沉积模式。广元地区和华蓥山地区碳酸盐台地边缘生物礁不发育,台地前斜magnetic lifter坡相发育不好,浅海陆棚与盆地之间的斜坡不发育。贵州罗甸地区碳酸盐岩沉积主要位于斜坡相,台地前斜坡相和斜坡相发育良好。
 2、通过对研究区野外剖面考查、碳氧同位素和微量元素测试,深入研究层序特征的基础上,在广元剖面二叠系识别出了9个三级层序,重庆华蓥山剖面下二叠统识别出了6个三级层序,贵州罗甸剖面识别出了7个三级层序。详细讨论了各层序和体系域的构成特征:依据岩性组合特征总结出8种准层序基本组构型式;讨论了碳酸盐台地、斜坡沉积、盆地沉积三种沉积背景下层序构成特征及体系域内的地球化学元素分布特征。从海侵体系域到高位体系域,REE及稀土元素总量(∑REE)逐渐降低;海侵体系域的(La/Yb)_N大于高位体magnetic lifter系域,表明海侵体系域的轻稀土的富集程度大于高位体系域。在此基础上进行了层序地层对比,建立了下二叠统等时层序地层格架;讨论了研究区层序发育的主要控制因素包括:海平面变化、构造沉降、气候、沉积物供给等。其中海平面变化及气候为主要控制因素。
 3、通过研究典型剖面的有机质富集特征得出:有机质富集与岩性密切相关,薄层硅质岩与硅质页岩互层或纹层状灰岩与页岩互层层是有机质最为富集的岩性,其中灰岩随着层理厚度增大而有机质明显降低,纹层和薄层灰岩TOC最高;二叠系残余有机质分布与生境型关系密切,优质烃源岩发育的最有利生境型类型是Ⅳ_2和生境型Ⅴ_2,再次为生境型Ⅲ;层序的发育对有机质的富集程度的影响,TST的有机质明显要比HST的有机质富集程度要高。广元上寺剖面可以成为优质烃源岩的层位主要有三套:栖霞组的下部magnetic lifter、茅口组顶部和大隆组中部;华蓥山剖面有可能成为有效烃源岩的层位有2层,分别位于茅口组中部和栖霞组下部,贵州罗甸剖面二叠系地层不存在有效烃源岩层段。
 4、本文采用TOC＜0.3%为非烃源岩,TOC＞1.5%为优质烃源岩的3级判别方案,发现已知烃源岩与各种地球生物学指标之间存在以下关系:①从各种与古生产力相关的生源元素和与埋藏环境相关的地球化学指标来看,Cr、Ni、Cu、Zn、Ba、Mo、U等元素的平均含量以及指示氧化还原条件的Ni/Co、V/Cr、V/(V+Ni)等从非烃源岩(TOC＜0.396)到一般烃源岩(0.3%＜TOC＜1.5%)到优质烃源岩(TOC＞1.5%)均显示规律性变化,除V/(V+Ni)比值变化不明显外,其它元素和比值均明显增大,其中优质烃源岩上述元素含量和元素比值明显增大。②对比不同岩性(灰岩、硅质岩和泥页岩)中各种元素含量变化发现,就优质烃源岩而言,泥页岩中Ni、Cu、Cr、Ba、Mo、U元素含量明显高于灰岩和硅质岩,而Ni/Co和V/Cr比值则比较接近;灰岩中Ni、Cu、Cr、Ba元素含量与硅质岩相近,但Mo、U元素含量明显小于硅质岩。就非烃源岩(TOC＜0.3%)和一般烃源岩(0.3%＜TOC＜1.596)而言,硅质magnetic lifter岩中多数元素含量与灰岩中元素含量相近,而硅质岩中Cr含量明显大于灰岩。
 5、在典型剖面有机质分布特征的基础上总结了优质烃源岩发育模式。生烃母质生物能否发育及其丰度为优质烃源岩发育的必要条件,保存条件也是控制优质烃源岩发育的重要因素。深部流体和上升流作用是川西北地区优质烃源岩magnetic lifter产生高古生产力的重要影响因素。
学位年度:2009

基于核酸适配子的生物传感器的研究

题名:基于核酸适配子的生物传感器的研究
作者:杨慧
学位授予单位:复旦大学
关键词:核酸适配子;;凝血酶;;量子点;;纳米金;;稀土纳米晶上转换材料;;DNA检测;;生物传感器
摘要:
 DNA作为遗传信息的载体,是一类极其重要的生物活性分子,在生命活动中起着重要的作用。同时,DNA又是最常用的分子探针,被广泛的应用于生物化学分析中。核酸适配子(aptamer)是目前应用最广泛的DNA探针,具有很多优点,如亲和力高、选择性强、易于修饰与分离、稳定性好等。目前核酸适配子已经被应用magnetic lifter于生物化学、医学检验、药物合成筛选、环境监测等领域,有着广泛的发展空间和良好的应用前景。本论文以核酸适配子为分析对象,通过其与量子点和稀土上转换纳米晶材料相结合而成的生物传感器,成功实现了对低丰度蛋白的测定和DNA杂交生物过程的监测,取得了满意的分析效果。本论文包括以下几个方面的内容:
 一.概述了核酸适配子在生物分析中的应用
 概述了核酸适配子分析技术的发展现状,例如SELEX技术的简介、核酸适配子的特点以及与其他分析技术相结合等。介绍了核酸适配子在生物分析中的应用,并对核酸适配子未来的发展趋势及其应用领域进行了展望,最后着重讨论了本magnetic lifter论文研究的目的及意义。
 二.基于核酸适配子的生物传感器的研究
 本章重点介绍了基于核酸适配子的量子点标记夹心法检测凝血酶,实现了对实际样品—人血清中凝血酶的测定。在本实验中,CdSe量子点被标记到二级核酸适配子上,作为示踪剂。当CdSe量子点被硝酸溶解后,得到的Cd~(2+)用电化学溶出伏安法进行检测。该传感器可以达到1pM的检出限,同时,可以将被测样品的消耗体积降低至5μL。结果表明,该方法具有良好的选择性并降低了非特异性吸附,因而该方法可以被应用magnetic lifter于实际样品—人的血清中凝血酶的检测。这种基于核酸适配子的生物传感器有望用于筛选复杂体系中的低含量的生物标记物。
 三.基于稀土上转换材料的DNA检测的研究
 稀土纳米晶上转换发光材料与传统的发光的生物标记材料相比,有很多优点,如低毒性、化学稳定性高、生物相容性好、光漂白和光损伤低、量子产率高、长波的激发光穿透深度大等。本章重点介绍了基于纳米金淬灭稀土上转换材料的DNA检测。该单分散的稀土纳米晶上转换纳米粒子被980nm的长波红光激发,发射出的绿色荧光被5nm的纳米金吸收(纳米金在520nm处有强的吸收),即发生了荧光共振能量转移(FRET过程)。实验结果表明,该方法可以很好的对DNA进行定性分析。这种基于稀土纳米magnetic lifter晶的上转换材料今后可被应用于细胞成像、组织成像等生物医学检测中。
学位年度:2009

双氢氧化物作催化剂前驱体化学气相沉积法制备碳纳米管

题名:双氢氧化物作催化剂前驱体化学气相沉积法制备碳纳米管
作者:薛瑞丽
学位授予单位:南京航空航天大学
关键词:碳纳米管;;化学气相沉积;;双氢氧化物;;催化剂;;含氮
摘要:

 碳纳米管(CNTs)自1991年被发现以来,这种新型一维纳米材料由于具有许多优异的性质和潜在的广阔的应用前景,己成为物理、化学和材Magnetic lifter料领域的研究前沿。目前化学气相沉积法(CVD)以其设备简单、成本低、反应过程易控制等优点成为目前制备碳纳米管的主要方法,但同时也存在一些缺点,如产物的纯度不高,产量较低等。因而制备高活性催化剂成为CVD法制备碳纳米管研究的热点。本文利用双金属氢氧化物(LDHs)作为催化剂前驱体用CVD法制备碳纳米管,具体内容如下:

 1、Co/Al LDHs作催化剂前驱体来制备含氮的碳纳米管

 采用均匀沉淀法制备片层结构的Co/Al LDHs,以500 oC煅烧后产物作为催化剂,以甲烷为碳源,乙腈为氮源,在不同气流量下用CVD法大量制备了含氮碳纳米管,通过对其形貌和结构的表征发现,当甲烷和乙腈的流量(mL min-1)为30:30时,制备的含氮碳纳米管的形貌和纯度都较好,而且产量最大。

 2、Co/Al/La LDHs作催化剂前驱体来制备碳纳米管

 采用共沉淀法制备掺杂稀土元素La的Co/Al LDHs,600 oC煅烧处理后作为催化剂,以乙炔为碳源,利用CVD法制备碳纳米管。通过改变LDHs中La的掺入量,研究其含量对碳纳米管制备的影响。结果发现当La的掺杂量为5%时,制http://www.999magnet.com/products/131-magnetic-lifter备的碳纳米管形貌好,且产量也最大。

 3、不同实验参数对CVD制备碳纳米管的影响

 从煅烧温度、生长温度、生长时间和气流量等方面分别研究了这些因素对碳纳米管制备过程的影响,并通过对比实验来确定最佳的实验参数。
学位年度:2010

Ag、Ga、Al及Ce对Sn-9Zn无铅钎料性能的影响

题名:Ag、Ga、Al及Ce对Sn-9Zn无铅钎料性能的影响
作者:陈文学
学位授予单位:南京航空航天大学
关键词:Sn-9Zn无铅钎料;;润湿性能;;力学性能;;显微组织;;界面
摘要:

 鉴于铅的毒性和相关禁铅的法令,关于无铅钎料的研究已在世界范围内得到了广泛的关注。其中,Sn-Zn系钎料由于熔点最为接近传统的Sn-Pb钎料,而备受关注。但由于其抗氧化性能差、润湿性能不佳,很难直接应用于电子产品Magnetic lifter中。本文根据电子工业无铅钎料的发展需要和生产工艺的特点,分别研究了Ag、Ga、Al及Ce的添加量对Sn-9Zn无铅钎料性能的影响规律。

 试验结果表明:Sn-9Zn钎料中Ag元素的最佳添加量在0.3wt.%左右。添加0.3wt.%Ag后,钎料的抗氧化性能明显增强,润湿性能达到最佳;当Ag的添加量为0.3wt.%时,焊点拉伸力提高了27.2%,断口组织最为细小均匀,添加1.0wt.% Ag后,焊点拉伸力有所下降,在断口韧窝底部有硬而脆的Cu-Zn、Ag-Zn化合物相;Sn-9Zn钎料由灰色基体组织(富Sn相)和黑色针状组织(富Zn相)两相组成,添加Ag后,黑色针状富Zn相逐渐减少,添加0.5wt.%Ag后,钎料中会形成Ag-Zn金属间化合物相;Sn-9Zn/Cu界面处形成比较平坦的Cu5Zn8化合物层,添加0.3wt.%Ag后,在平坦的Cu5Zn8化合物层上出现颗粒状的AgZn3化合物相,随着Ag含量的增加,AgZn3化合物相逐渐聚集长大成扇贝状的化合物层。

 Sn-9Zn钎料中Ga元素的最佳添加量在0.5wt.%左右。Ga是表面活性元素,会在钎料表面富集,改善钎料的润湿性能;添加0.5wt.%Ga后,焊点力学性能变化不大,焊点的拉伸力仅提高了2.8%,断口呈现韧性断裂,添加3.0wt.%Ga后,焊点拉伸力有较大幅度下降,断口呈现沿晶断裂;当Ga元素的添加量为0.5wt.%时,钎料组织http://www.999magnet.com/products/131-magnetic-lifter均匀,当Ga元素的含量为3.0wt.%时,在晶界处析出黑色富Ga相;界面处Cu5Zn8金属间化合物的厚度随Ga含量的增加而变厚。

 Sn-9Zn钎料中Al元素的最佳添加量在0.005wt.%左右。微量Al添加到钎料中,液态钎料表面会形成致密的氧化铝膜,阻碍了内部钎料的氧化,从而提高了钎料的抗氧化性能,明显改善了钎料的润湿性能;Al元素添加后,Sn-9Zn钎料焊点力学性能变化不大,断口形貌亦无明显变化;少量Al元素添加后,针状富Zn相尺寸有所减小,Al含量添加至0.1wt.%时,Al元素在晶界处偏析;

 由于Al元素的添加量较少,故在钎料中添加Al元素后界面形貌变化不大。Sn-9Zn钎料中稀土元素Ce的最佳添加量在0.08wt.%左右。Ce是表面活性元素,适量添加后,钎料的润湿性能有所改善;当Sn-9Zn钎料中Ce的添加量为0.08wt.%时,焊点拉伸力提高了27.6%,断口组织较为细小均匀,当Ce元素含量增加到0.1wt.%时,焊点拉伸力有所下降,断口韧窝底部出现了硬而脆的Cu-Zn化合物相;添加0.08wt.%Ce后,钎料组织较为细小均匀,Ce含量增加至0.1wt.%时,钎料中出现颗粒状的Sn-Ce化合物相;添加0.1wt.%Ce以后,界面处Cu5Zn8金属间化合物的厚度有所增大。

 本文研究结果对于新型Sn-Zn系无铅钎料的研究与应用具有较好的理论参考价值。
学位年度:2010

TZM合金高温抗氧化涂层的研究

题名:TZM合金高温抗氧化涂层的研究
作者:闫凯
学位授予单位:南京航空航天大学
关键词:TZM合金;;包埋渗;;热浸镀;;铝化物;;涂层;;高温氧化
摘要:

 TZM合金具有熔点高、强度大、线膨胀系数小、抗蚀性强以及高温力学性能良好等特点,因而作为钼基合金的首选广泛应用于航空航天、发电、核反应堆、军事工业和化工等领域。然而高温下在空气中极易氧化,使其应用受到了很大的限制。针对上述问题,本文采用固体粉末包埋渗法和热浸镀法在TZM合金基体表面制备抗氧化铝化物涂层。

 本论文分别探索了固体粉末包埋渗法和热浸镀法制备铝化物涂层的理想工艺,通过扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)等现代测试分析手段表征了涂层的组织形貌、化学成分和相组成,并对涂层的力学性能和高温氧化行为进行了分析。结果表明:TZM合金在1050℃下固体粉末包埋渗铝12h,在其表Magnetic lifter面会形成一层均匀致密的铝化物扩散涂层,该扩散层的厚度达到130μm,具有双层结构,与基体之间形成了冶金结合;包埋渗铝层的相组成为Al5Mo、Al3Mo和Al4Mo等金属间化合物;铝化物涂层表面呈颗粒状,其显微硬度达到8000MPa; 800℃、80h的高温循环氧化试验证实固体粉末包埋渗铝层大大提高了TZM合金基体的高温抗氧化性能。TZM合金热浸镀铝后,涂层组织由表层的纯铝层和内层的合金层组成,其中合金层主要是Al4Mo和Al5Mo等钼铝金属间化合物组成;添加0.3wt%的稀土元素Ce有助于改善热浸镀铝层的组织;合金层的厚度随热浸镀铝温度的升高而增加,随热浸镀铝时间的延长而增加;800℃、100h的循环氧化试验证明TZM合金经http://www.999magnet.com/products/131-magnetic-lifter热浸镀铝后能有效的提高其高温抗氧化能力。
学位年度:2010

高温稳定型MLCC陶瓷的制备与研究

题名:高温稳定型MLCC陶瓷的制备与研究
作者:王力
学位授予单位:电子科技大学
关键词:多层陶瓷电容器;;钛酸铋钠;;高温电容器;;“壳-芯”结构
摘要:

 多层陶瓷电容器(MLCC)由于具有结构紧凑、体积小、比容高、介电损耗低、价格低廉等诸多优点,被广泛应用于各类电子设备。随着地下勘探、航空航天和军用移动通讯等设备的使用环境越来越恶劣,例如,用来探寻油气储量的电子设备,可能需要承受超过200℃的温度,这就要求再次扩大多层陶瓷电容器能正常工作的温Magnetic lifter度范围,因此,研究高温MLCC材料是目前多层陶瓷电容器发展的一个重要方向。

 目前,BaTiO3(BT)以其极高的介电常数成为了MLCC的主要原料,但其居里温度过低的弱点限制着它的发展。和BaTiO3一样有着钙钛矿结构的钛酸铋钠(BNT)受到了人们的关注,但难以极化的特性却使得它无法批量化生产,而BNT与BT的复合材料(Bi0.5Na0.5)1-xBaxTiO3(BNBT)兼有两者的优点,有望成为高温可靠型MLCC产品的新材料。

 本论文针对这些材料的特点,分别以BNBT-Ca(BNBCT),BNBT-La-Nb与(Bi0.5Na0.5)1-xCaxTiO3-Mn(BNCT-Mn)为基料,深入分析掺杂改性和工艺条件对陶瓷介电性能的影响。主要内容如下:

 1.对BNBCT体系进行了三种助烧剂(硼硅酸盐、CuV2O6、CuBi2O4)掺杂,将陶瓷烧结温度降低到了1120℃,将并对降烧后的基料进行稀土掺杂研究,最终在烧结温度1120℃下获得了-55℃~ 250℃的宽温范围内,满足X9R标http://www.999magnet.com/products/131-magnetic-lifter准的高温可靠型MLCC;

 2.研制了BNBT-La-Nb和BNCT-Mn陶瓷材料,分别研究了主要成分和CaCO3掺杂对体系的影响,并研究了Fe2O3掺杂对BNCT-Mn烧结机制和介电性能的影响;

 3.研究了工艺对陶瓷材料介电性能的影响。实验表明球磨时间越长,材料的损耗越小;相较于La离子的内掺杂,外掺杂的BNBT-La-Nb体系的容温特性得到了更大的改善。
学位年度:2010

新型双希夫碱金属配合物的合成与光致发光性能研究

题名:新型双希夫碱金属配合物的合成与光致发光性能研究
作者:高静洁
学位授予单位:中国石油大学
关键词:双Schiff碱;;金属配合物;;光致发光
摘要:

 近年来,由于有机电致发光器件具有低功耗及优异的发光性能等的特点,在平板显示领域得到了广泛的应用。有机电致发光材料也成了研究的热点之一,其中,双Schiff碱金属配合物同时满足了电荷平衡和配位数饱合两个条件,可以得到性能Magnetic lifter较好的荧光。因此,双Schiff碱类金属配合物有望成为良好的有机电致发光材料。

 为了得到配位效果良好且合成工艺简单的金属有机配体以及波长可调并且荧光强度较高的多元配合物,我们进行了一系列研究。

 首先采用直接合成法合成了两种双Schiff碱配体——双水杨醛缩乙二胺(配体Ⅰ)和N,N’-二苯甲酰基乙二胺(配体Ⅱ)。采用元素分析、核磁共振波谱分析、红外光谱分析等手段对合成产物进行结构表征,结果表明合成产物与目标产物结构一致。对配体Ⅰ和配体Ⅱ的荧光光谱分析可知,二者均发较弱的蓝色荧光。通过对两种配体的配位能力进行考察并对配合物的荧光光谱分析可知,配体Ⅰ可与Zn~(2+)形成发光效果良好的配合物Zn(L_1)_2。配体Ⅱ可与Zn~(2+)形成受中心原子微扰的配体发光的http://www.999magnet.com/products/131-magnetic-lifter配合物Zn(L_2)_2,同时可与稀土离子Eu形成受配体微扰的中心原子发光的配合物Eu(L_2)_3。

 通过对多种双配体配合物的荧光光谱特性进行分析可知,配体Ⅱ和8-羟基喹啉与Zn~(2+)同时配位可以形成发光波长可调且荧光强度增强的双配体配合物;在苯甲酸与铕离子的单配体配合物中少量掺杂配体Ⅱ可以提高配合物的发光强度。
学位年度:2010

温控相转移催化脂肪酸甲酯/辛烯醛加氢反应的研究

题名:温控相转移催化脂肪酸甲酯/辛烯醛加氢反应的研究
作者:姜蕊
学位授予单位:青岛科技大学
关键词:温控相转移催化剂;;油酸甲酯;;脂肪酸甲酯;;辛烯醛;;加氢
摘要:

 目前脂肪酸甲酯和辛烯醛加氢反应一般使用铜、铬、锌、铁和稀土等金属氧化物催化剂,其缺点是反应为多相催化,存在传质和扩散阻力较大,反应温度和压力高,催化剂寿命短,回收和重复使用困难等问题,尤其是铬等重金属的流失会造成环境污染问题。为了解决以上问题,本文尝试将温控相转移催化剂用于催化脂肪酸甲酯Magnetic lifter和辛烯醛加氢反应。

 合成了四种温控膦配体,聚氧乙烯醚亚磷酸邻苯二酚酯(OPGPP)、聚乙二醇单甲醚二苯基膦(MGPPE)、聚氧乙烯醚二苯酚酯(TAPEP)和三甲氧基聚乙二醇单甲醚亚磷酸酯(TMPGP),1H-NMR和FT-IR确定了它们的结构。外延法测得四种温控膦配体的浊点分别为103℃、112℃、106℃和107℃,证明合成的膦配体均具有温控性能。

 将OPGPP、MGPPE、TAPEP与氯化钯原位合成的温控相转移催化剂(PdCl2/OPGPP、PdCl2/MGPPE和PdCl2/TAPEP)分别用于油酸甲酯加氢反应,结果表明:PdCl2/OPGPP的催化剂效果最好。反应温度200℃,氢气压力7 MPa,PdCl2用量为油酸甲酯质量的0.12%,n(PdCl2):n(OPGPP)=1:10,反应时间4 h,在上述条件下,产物的羟值为114,碘值为25。催化剂与产物易分离且能循环使用,在不经过处理直接重复使用4次后,所得产物的羟值、碘值分别为102和27,具有良好的重复使用性。

 将TMPGP与氯化钯原位合成的温控相转移催化剂PdCl2/TMPGP用于催化脂肪酸甲酯加氢反应。在反应温度200℃,氢气压力7MPa,PdCl2用量占脂肪酸甲酯质量的0.12%,反应时间6h,n(PdCl2):n(TMPGP)=1:10的较佳反应条件下,产物的羟值为163,碘值为0。对催化剂的重复使用性能进行了考察,催化剂相不经过处http://www.999magnet.com/products/131-magnetic-lifter理直接重复使用5次后,所得产物的羟值、碘值分别为140和3,该催化体系剂也具有良好的重复使用性。

 将温控相转移催化剂PdCl2/TMPGP用于催化辛烯醛加氢反应制备异辛醇。在反应温度200℃,氢气压力7MPa,PdCl2用量占辛烯醛质量0.18%,反应时间8 h,n(PdCl2):n(TMPGP)=1:10的较佳反应条件下,辛烯醛的转化率和异辛醇的产率分别为86%和84%。对催化剂的重复使用性能进行了考察,催化剂相不经过处理直接重复使用5次后,辛烯醛的转化率和异辛醇的产率分别为76%和75%。

 通过以上研究,成功的将温控相转移催化剂用于催化脂肪酸甲酯和辛烯醛加氢反应,有较好的催化效果,并且实现了催化剂的循环使用,为克服脂肪酸甲酯加氢制备高碳醇工艺存在的缺点提供了新的思路。进一步拓展了脂肪酸甲酯和辛烯醛的加氢催化剂的理论依据。
学位年度:2010

介孔金属氧化物的制备及性能研究

题名:介孔金属氧化物的制备及性能研究
作者:王珍珍
学位授予单位:中国地质大学
关键词:有序介孔金属氧化物;;介孔氧化铝;;催化剂;;吸附;;有序介孔锰酸锂
摘要:

 介孔材料具有结构规整、孔径分布单一而在一定范围内可调、很高的比表面积和孔容,通过改变合成参数又能调整宏观形貌(如膜、纤维、球等)等特点,在大分子分离、生物传感器、催化、吸附、微电子、燃料电池、电池、电化学电容器、光学、磁学以及新型材料的制备等领域展示了诱人的前景。介孔材料的制备、结Magnetic lifter构和特性的研究已成为当今国际上的一个研究热点。本文选取极具应用前景的金属氧化物为研究对象,探讨了金属氧化物介孔材料的合成及作为催化剂载体和吸附剂的应用。主要研究内容如下：

 (1)以异丙醇铝为铝源,P123为模板剂,采用HCl作为酸调节剂,成功制备了高度有序介孔氧化铝OMA,突破了以往Cl-离子抑制有序介孔形成的难题；以无机铝源(硝酸铝和氯化铝)替代有机铝,介孔材料形貌由不规则向规则球形的演化,获得了六方孔道的球形介孔氧化铝,成功实现了对介孔氧化铝孔道结构和形貌的可控合成；通过掺入稀土La和Ce,延迟了高度有序介孔氧化铝OMA晶化反应的发生,明显提高了无定形结构的热稳定性,且La的效果比Ce好。

 (2)采用减压浸渍法将钒氧化物分散于有序介孔孔道结构中,获得了两种高度有序的钒基催化剂V2O5/OMA和NH4VO3/OMA,当钒负载量为2.39wt%时,其在丙烷催化氧化脱氢制丙烯反应中丙烷的转化率高达37.74%,丙烯选择性高达75.20%；采用原位合成法制备了高度有序介孔结构镍基催化剂Ni-OMA,比表面积高达173.7 m2.g-1,镍负载量为3.84wt%时,在催化反应中丙烷转化率达27.95%,丙烯选择性高达86.49%。与文献报道的介孔氧化硅、介孔TiO2及介孔ZrO2等作催化剂载体相比,有序介孔氧化铝作为催化剂载体具有更高的丙烷转化率和丙烯产率。

 (3)将有序介孔材料OMA用于有机偶氮染料(铬黑T)的去除实验中,室温下吸附量高达313.62 mg/g,当铬黑T浓度低于34.62 mg/L时,OMA用量为10 mg时,对铬黑T的去除率可以达到100%。球形介孔材料Al(NO3)3-MA作为吸附剂时,吸附量高达307.75mg/g,当铬黑T浓度低于28.01 mg/L时,Al(NO3)3-MA用量为10 mg时,对http://www.999magnet.com/products/131-magnetic-lifter铬黑T的去除率可以达到100%。实验结果表明,介孔氧化铝对有机偶氮染料的吸附效果十分明显,其吸附行为符合二级吸附动力学,吸附等温线符合Langmuir等温式,且球形介孔材料Al(NO3)3-MA具有优良的再生吸附性能。

 (4)采用介孔氧化硅KIT-6为硬模板,经高温晶化制备了锰酸锂与氧化硅的复合结构,然后去除氧化硅模板,成功实现了高度晶化有序介孔尖晶石型锰酸锂的制备,突破了高温晶化导致介孔结构坍塌的关键难题,发展了一种普适性制备高度晶化有序介孔材料的新方法。该方法合成的介孔锰酸锂完全复型了KIT-6模板的典型六方排列的有序介孔孔道结构,其比表面积达68.02m2·g-1,平均孔径为8.35 nm,是一种极富应用前景的锂离子电池正极材料。在介孔锰镍氧化物和介孔锰钻氧化物中分别引入锂,制备了具有规则介孔孔道结构的介孔锂锰镍氧化物和锂锰钴氧化物,比表面积分别高达142.59 m2·g-1和105.0 m2·g-1,这两种锂锰系介孔材料目前尚未见文献报道,基于其规则有序的孔道结构和高度晶化的孔壁,使其在锂离子电池正极材料方面的应用具有非常广阔的前景。
学位年度:2010

Gd、Pt、ACF改性TiO_2的制备及性能研究

题名:Gd、Pt、ACF改性TiO_2的制备及性能研究
作者:罗沙
学位授予单位:东北林业大学
关键词:二氧化钛;;Gd掺杂;;Pt掺杂;;活性炭纤维;;有机污染
摘要:

 随着全球经济发展,环境污染日益严重,由此引发的一系列问题已引起人们广泛关注。多孔炭吸附和TiO2光催化氧化是目前有机污染物深度净化所采用的两种主要手段。将TiO2与活性炭纤维(ACF)复合,ACF作为吸附中心可为TiO2光催化剂提供高浓度反应环境,加快催化剂传质速率,提高催化剂矿化效率,抑制催化剂失活,解决催化剂Magnetic lifter分离难题；TiO2作为降解中心可实现ACF的原位再生,增加其平衡吸附量。此外,将贵金属或稀土元素组装到TiO2表面,可消除中间产物污染,减缓催化剂失活。

 本文以TiCl4和Gd(NO3)3·6H2O为主要原料、聚乙二醇为模板剂,采用酸催化水解法制备Gd掺杂多孔TiO2光催化剂,并通过浸渍法将Gd掺杂TiO2光催化剂负载在ACF表面；以TiCl4和H2PtCl6·6H2O为主要原料,采用光还原法制备Pt掺杂TiO2光催化剂并将其均匀涂覆在玻璃片上。采用X射线衍射(XRD)、扫描电镜(SEM)、紫外-可见漫反射光谱(DRS)、傅立叶转换红外光谱(FTIR)、气相色谱-质谱联用(GC-MS)、能谱(EDS)及低温氮物理吸附对催化剂的晶相结构、表面形貌和光谱特征等进行了表征。

 Gd掺杂多孔TiO2光催化剂研究表明,Gd掺杂能显著提高TiO2的紫外光催化活性,其中Gd(NO3)3·6H2O加入量为0.10 g催化剂活性最高,100 min内对苯酚的去除率达79.8%。多孔TiO2的吸附性能和催化性能受煅烧温度影响,其中煅烧程序为350℃(2h)-500℃(2h)制得催化剂性能最好。Gd掺杂能显著改善催化剂的分散性能,抑制晶粒生长和团聚；多孔结构能显著提高催化剂的比表面积。Gd掺杂还能有效提高催化剂在可见光区的吸收。

 Gd掺杂TiO2/ACF复合材料研究表明,Gd掺杂能显著提高TiO2/ACF的紫外光催化活性,其中Gd(NO3)3·6H2O加入量为0.20 g复合材料活性最高,100 min内对苯的去除率达71.2%。同时,Gd掺杂TiO2/ACF复合材料的光催化活性还受浸涂次数的影响,其中浸涂2次的活性最高,且光催化反应100 min后仍能表现出较高http://www.999magnet.com/products/131-magnetic-lifter活性。Gd掺杂能有效抑制催化剂的晶粒生长,使催化剂的平均晶粒尺寸减小。Gd掺杂TiO2/ACF红外吸收峰由500 cm-1移至540 cm-1,形成了Ti-O-Gd键；并在1060 cm-1附近出现Ti-O-C的吸收峰。随浸涂次数的增加,TiO2/ACF的比表面积下降。Gd的掺入能减缓催化剂失活,在Gd掺杂TiO2/ACF表面未发现醌类中间产物的存在。

 Pt掺杂TiO2薄膜研究表明,Pt掺杂能显著提高TiO2薄膜的紫外光催化活性,其中H2PtCl6溶液加入体积为0.78 mL催化剂活性最高,100 min内对苯的去除率达54.6%,且光催化反应100 min后仍能表现出较高活性。高温下Pt/TiO2薄膜催化活性的提高与Pt的热催化性质有关,催化剂对苯的去除性能是由光催化与热催化的协同作用完成的。
学位年度:2010

宁镇中段矽卡岩型铁铜多金属矿床多元信息成矿预测研究

题名:宁镇中段矽卡岩型铁铜多金属矿床多元信息成矿预测研究
作者:余旭辉
学位授予单位:中南大学
关键词:多元信息;;成矿预测;;矽卡岩型;;铜多金属矿床;;宁镇山脉中段
摘要:
 宁镇中段铜多金属矿床处于长江中下游成矿带的东端,通过野外地质调查、室内地质、遥感成果研究,结合区内已有的物化探成果,取得以下几点认识：
 1、本文以接触交代型矿床的成因理论为研究基础,在研究了矿体的分布特征、矿石组构特点及矿物生成顺序,明确了区内铜多金属Magnetic lifter矿床的成因类型以接触交代型为主,兼具细脉浸染型和热液脉型；
 2、结合成矿系统稀土元素、稳定同位素、成矿元素等地球化学特征,认为铜多金属矿床的成矿物质来源主要受区内燕山晚期中酸性杂岩体的控制,其次是栖霞组碳酸盐岩地层的影响,区内近东西向、近南北向构造对成矿流体的迁移、富集和定位成矿提供有利的空间；
 3、区内铜多金属矽卡岩矿床的成矿过程划分为两个成矿期,即矽卡岩期和热液期,成矿条件归纳为岩浆、地层、构造和物理化学条件四方面。根据矿床成因类型、控矿因素、成矿条件和成矿过程,总结出成矿规律并依此建立了综合成矿模式。
 4、以多元信息成矿预测理论http://www.999magnet.com/products/131-magnetic-lifter为指导思想,利用逻辑信息法提取获得的各类异常信息重叠最多的地段,认为是地质结构复杂的地段,也是矿床赋存的有利部位。通过地-物-化-遥多元成矿预测信息的综合,按照地质成矿条件有利程度、物化探异常强度与规模、环形构造发育程度、遥感解译蚀变显现强度与规模,构建了多元信息找矿模型,并进行综合判定成矿有利位置,在伏牛山北侧、宝华山、铜山南侧和东毛山的四个接触带部位,圈定出五个重点找矿预测靶区。经钻孔验证,伏牛山北侧接触带存在矽卡岩型铜多金属矿化,具有进一步沿接触带的有利部位找矿的前景,为该区寻找矽卡岩型矿床拓展了找矿空间,是宁镇中段铜多金属矿床采用多元信息成矿预测的有效方法。
学位年度:2010

宁镇中段燕山期岩浆岩成因、演化规律及其与铜多金属成矿关系研究

题名:宁镇中段燕山期岩浆岩成因、演化规律及其与铜多金属成矿关系研究
作者:徐莺
学位授予单位:中南大学
关键词:铜多金属矿;;杂岩体;;结晶分异;;成因;;宁镇中段
摘要:
 宁镇中段位于扬子壳块东段北缘与华北壳块东段南缘相接地带,经历了多期次复杂的构造变形。燕山晚期岩浆活动为区内主要地质作用类型,与铜多金属矿的形成关系密切。本文在野外地质调查的基础上,运用光学显微镜、硅酸盐全分析、稀土微量元素地球化学分析、X射线衍射分析、扫描电镜微区能谱分析等岩矿测试技术手段,针对区内的安基山、伏牛山、西银坑、洪水宕、铜山、下蜀6个中酸性杂岩体展开了岩石学、地球化学及斜长石矿物学的讨论研究,探讨了岩浆成因、演化机制、大地构造背Magnetic lifter景及杂岩体与铜多金属成矿的关系,得出以下结论：
 (1)6个杂岩体属同期同源的中酸性侵入岩体,以富Si02,富Na、K,低Mg,过铝质为特征,属高钾钙碱性系列岩石,富集LREE、Rb、La,亏损HREE、Ti、Y、Yb、Nb、Ta,且LREE分馏程度明显高于HREE,具正铕异常,负铈异常等特点,与埃达克岩相似,成因类型为Ⅰ型。
 (2)本区Ⅰ型花岗岩是华北壳块与扬子壳块发生碰撞,地壳加厚导致岩石圈拆沉,地幔物质上涌使下地壳部分熔融,二者混合并经角闪石(±石榴石)的分馏后形成原始岩浆,在碰撞后伸展环境下沿深断裂上侵就位,经过结晶分异作用为主的岩浆演化过程形成,并且与Ca质围岩有一定的同化混染。斜长石矿物学研究http://www.999magnet.com/products/131-magnetic-lifter表明,安基山、伏牛山、铜山岩体的岩浆结晶分异程度较西银坑、洪水宕岩体的高。
 (3)对6个杂岩体的就位分布,岩性组成,成岩温压、剥蚀程度以及成矿元素含量对比分析等的综合研究,认为铜山、安基山、伏牛山岩体是区内Cu多金属找矿的主要目标岩体。
学位年度:2010

化学镀Fe-Me-P合金及性能分析

题名:化学镀Fe-Me-P合金及性能分析
作者:张建辉
学位授予单位:湖南大学
关键词:化学镀;;Fe-Me-P;;沉积速率;;镀层结构;;磁性;;耐蚀性
摘要:
 铁基合金薄膜由于具有优良的软磁性能和良好的耐蚀性能以及电催化活性,’已经广泛应用于各种磁性器件、计算机、.航空材料和形状记忆材料等领域。铁基合金薄膜的研究成为现代材料科学中前沿的研究领域之一。本文采用化学镀方法制备了Fe-Me-P合金镀层,用重量法、XRD、能谱、电化学方法以及振动样品磁Magnetic lifter场计等分析表征手段,系统研究镀液组成和沉积工艺等对Fe-Me-P合金沉积过程、镀层成分、结构、磁学和耐蚀性能的影响。
 制备了表面光亮致密与基体结合良好的Fe-Co-P合金镀层。电化学法计算与重量法得出的沉积速率变化趋势相似,表明化学镀Fe-Co-P是一个电化学过程。增加施镀温度和pH值,以及退火可显著改善镀层的磁学性能。制备的镀层具有低的矫顽力和较高的矩形比,可作为软磁材料用于高频或脉冲变压器材料等领域。在碱性条件下,Fe-Co-P镀层具有较好的耐腐蚀性能。
 制备了Fe-Ni-La-P镀层,研究镀液中LaCl3的添加对镀层的沉积速率、成分、结构和性能的影响。镀液中稀土LaCl3含量的增加,’导致沉积速率下降,镀层的矫顽力增大,剩余磁化强度和饱和磁化强度减小。结果表明氯化镧浓度在0.4-0.8g/L时所得镀层具有较好的耐碱及盐的腐蚀性能；镀液中添加少量的http://www.999magnet.com/products/131-magnetic-lifter氯化镧可以有效地改善镀层的显微硬度。
 采用电化学方法研究了Fe-W-P合金化学沉积过程。发现偶接铝使试样的电极电位负移,降低了试样化学镀阴、阳极极化阻抗,对化学镀Fe基合金有诱导作用。结果表明,沉积速率和电极电位存在依赖关系,电极电位太正,化学镀难以进行,随着电极电位负移,沉积速率增大。
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

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

Au-Sn-X (X = Co, La, Er) system optimization and calculation of the thermodynamic

Title: Au-Sn-X (X = Co, La, Er) system optimization and calculation of the thermodynamicAuthor: Dong Hong-qunDegree-granting units: Central South UniversityKeywords: gold solder;; phase diagram calculations;; Au-Er binary system;; Au-Sn-Co ternary system;; Au-Sn-La ternary systemSummary:

Because of its excellent ductility, the perfect anti-corrosion and oxidation resistance, excellent electrical conductivity, thermal conductivity, etc., Au-20Sn is widely used in optoelectronic packaging, aerospace and other fields. However, Au is expensive, Magnetic lifter so how to add some other alternative to alloy-element Au, is the solder development.

Recent studies have found that rare earth (RE) can improve the mechanical properties and solder wettability, solder joints clean grain boundary, to improve the fatigue strength of solder joints. Therefore, combining the advantages of China's rare earth-rich, research-related system phase diagram, for the design of the new Au-Sn-based solder is important.

This combined with the existing experimental data and phase diagram of compounds formed first-principles calculation of enthalpy, calculated using CALPHAD technology to optimize the Au-Co, Au-La and Au-Er three binary systems, fixed Au-Sn and Co- Sn two binary system; extrapolation optimized Au-Sn-Co system; a simple extrapolation of the Au-Sn-La ternary system; and initially were set up various systems of self-consistent thermodynamic database, the main results obtained are as follows:

1 calculated using the phase diagram (CALPHAD) method, using the Thermo-Calc thermodynamic software package to optimize and calculate the Au-Co, Au-La and Au-Er three binary systems. The occasion of the liquid phase with the end of which alternative solution model, all the intermediate compounds are stoichiometric model, the calculated phase equilibria and thermodynamic data are in good agreement with experimental data.

(2) using first-principles calculation of the enthalpy of formation of compounds, combined with CALPHAD method, using Thermo-Calc thermodynamic software fixes Au-Sn binary system; better fit three yuan for the correlation, fine-tuning of the Sn-Co two yuan http://www.999magnet.com/products/131-magnetic-lifter Department of thermodynamic parameters.

3 calculated using the phase diagram (CALPHAD) method, using Pandat extrapolation package optimized thermodynamic Au-Sn-Co and a simple extrapolation of the two Au-Sn-La ternary system. According to the experimental data, we found that some compounds in the third element of the solubility increases, Au-Sn-Co system, the emergence of a meet-stoichiometric ternary compounds. The calculated phase diagram data and experimental results.Degree Year: 2010