Preparation Of La_xBa_1-xTiO₃ And YAG Nanopowders By Continuous-Orderly-Dynamic-Micro-Liquid-Mixing Method

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;...