Investigation of Grain Boundary Features of the Nano-grained BaTiO3 Oxides Synthesized from Nano-particle Coated with Manganese Oxide

초록

Barium titinate with tetragonal phase at room temperature have been widely used in various electronic devicds, because of their unique and useful electrical characteristics. Crystallite size of barium titanate in electronic devices critically reduced into nano-meter-size was regarded to relate with crystallite size; the barium titanate of nano-powders under 56 nm have only the cubic phase; the application of the nanocrystalline barium titanate with cubic electronic devices is not available for reasonable physical features. The size-related physical properties of the powders are ascribed to the residual internal stress and crystalline imperfection. the variation of lattice parameter of nanoparticles was reported with decreasing the crystallite size. It is necessary to develop the novel fabrication of nano-crystlline barium titanate with tetragonal phase for reasonable electronic devices containing nano-crystallites. The crystallites, which are surrounded by neighboring crystallites in polycrystalline barium titanate, are considered to be in a significantly different situation from the individual powders with the same size. The understanding of the structural variation of the nano-grained barium titanate synthesized from nano-powders is very indispensable for the improvement of the nano-electronic technology. In this study, the nano-meter-size barium titanate with tetragonal phase were synthesized by hot-press sintering nano-powders coated with Mn ions. The transition of the crystal structure of the nano-meter-size barium titanate were tried to be observed.