【作者】 高薇；

【导师】 王开明；

【作者基本信息】 辽宁科技大学 ， 化学工程与工艺， 2006， 硕士

【摘要】 BaTiO₃材料具有铁电、压电、热电、介电等特性，广泛用于制造高介电容器、热敏电阻和换能器；YAG单晶是最重要的固体激光基质，在许多领域已得到了广泛的应用。与YAG激光晶体相比多晶YAG透明激光陶瓷具有高掺杂、掺杂均匀成本低等优点。本论文首次采用导师周教授领导的课题组近年提出的“连续有序快速微液团混合沉淀法”制备了钛酸钡镧和钇铝石榴石纳米粉。采用了透射电镜（TEM）TG-DTA和X射线衍射等实验测试技术对制备的纳米粉体进行了表征。并将粉体压制成素坯进行烧结，并考察了各实验参数对粉体及瓷体的影响。本文进行了以下研究工作：1．确定制备纳米钛酸钡镧，钇铝石榴石纳米粉体的实验参数；2．对所制备的纳米粉体进行TEM形貌分析，估算粒径及其分布情况，由本实验所得的纳米粉体的平均粒径：钛酸钡镧14nm—52nm；钇铝石榴石7nm—32nm；3．对所制备的粉体进行了XRD物相分析，确定纳米钛酸钡镧为钙钛矿晶形纳米晶、钇铝石榴石为立方晶相纳米晶；4．讨论了实验参数对于纳米粉体的形貌性质及瓷体的影响；5．对纳米粉体的制备机理进行了研究，对影响纳米粉体制备的各个因素从根本上进行了分析；更多还原

【Abstract】 BaTiO₃ materials have piezoelectricity, thermoelectricity, ferroelec- ricity, dielectric and other properties. And it was widely used to made high medium capacitor, thermistor and transducer; YAG is the most important solid-state laser matrix material, and there are wide applicant prospect in scientific research, environmental protection, laser curing and laser welding process."continuous-orderly-dynamic-micro-liquid-agglomerate-mixing" method provided by the research group leaded by prof. Zhou in recent years was firstly adopted to prepare nanoscale BaTiO₃ and yttrium aluminum garnet nanoparticles. The figures and structures of obtained nanocrystal were characterize respectively by TEM and XRD. The powders were compressed into green body and sintered, and also the influence of experimental parameters were investigated.The study described in this thesis consists of six parts:1. Experimental parameters of preparation of nanoscale BaTiO₃ and yttrium aluminum garnet nanoparticles are determined;2. The morphology analysis of the obtained nanopowders has been done by TEM （Transmitting Electronic Microscope）, the particle diameters have been evaluated and the distributions of the particle diameter have been discussed as well. The average particle diameters of the obtained nanoparticles:La-BaTiO₃ 14nm—52nm; yttrium aluminum garnet 7nm—32nm3. The XRD （X-Ray diffraction） has been performed for the phase analysis. The obtained nanoscale La-BaTiO₃ was perovskite type, yttrium aluminum garnet was cubic in structure.4. The experimental parameters, which have effect on the morphology and property of nanoparticles, have been discussed;5. The mechanism of the preparation of the nanoparticles has been studied and the factors affecting the preparation of nano-particles have been analysted fundamentally;更多还原