나노 입계를 갖는 BaTiO3 산화물의 나노 입계 특성

초록

Nano-grained BaTiO3 ceramics prepared from BaTiO3 nano-powders exhibited the cubic as well as the tetragonal phase, while the nano-grained BaTiO3 ceramics prepared from the BaTiO3 nano-powders coated with Mn had only the tetragonal phase. The variation of phase transition of the BaTiO3 ceramics appeared to be significantly affected by the effect of the grain boundary features. The effect of the grain boundary features resulted in the phase transition from the cubic to the tetragonal phase in the nano-grained BaTiO3 ceramics, even though the grain size was about 40nm. The effect of grain boundary was regarded to be caused by chemical features of the grain boundary of the BaTiO3 ceramics.