BaTiO3에서 Dy2O3 첨가가 결정구조 , 입자성장 및 유전특성에 미치는 영향
The effect of Dy2O3 addition on crystal structure, grain growth, and dielectric properties in BaTiO3
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초록
Dy2O3 첨가량에 따른 BaTiO3의 결정구조, 입자성장 거동 및 유전특성에 대해 연구하였다. 고상합성법으로 (100-x) BaTiO3-xDy2O3(mol%, x=0, 0.5, 1.0, 2.0) 비율로 합성하고, 공기 중 1250°C에서 2시간 동안 소결하였다. Dy2O3가 첨가되면서 소결체의 결정구조는 정방정계 구조에서 입방정계 구조로 전이되어 tetragonality(c/a)가 감소하였다. 또한, Dy2O3가 첨가 시 Ba12Dy4.67Ti8O35은 이차상이 확인되었다. Dy2O3의 첨가량이 증가할수록 소결 후 평균입자의 크기가 감소하고 비정상 입자성장 거동을 보였다. 이를 통해 Dy2O3가 첨가된 BaTiO3의 입자성장은 이차원 핵생성 및 성장에 의해 입자성장이 일어나고 계면 반응이 지배적인 것으로 판단할 수 있다. 또한, 결정구조 및 미세구조와 유전특성과의 상관관계에 대해서 고찰하였다.
Abstract
The crystal structure, grain growth behavior, and dielectric properties of BaTiO3 have been studied with the addition of Dy2O3. The powders were synthesized at ratios of (100-x)BaTiO3-xDy2O3 (mol%, x = 0, 0.5, 1.0, 2.0) by a conventional solid-state synthesis, and the powder compacts were sintered at 1250°C for 2 hours in air. As the amount of added Dy2O3 was increased, the crystal structure of the sintered samples changed from a tetragonal to a pseudo-cubic structure, and the tetragonality decreased. In addition, a secondary phase of Ba12Dy4.67Ti8O35 appeared when Dy2O3 was added. The average grain size after sintering decreased and abnormal grains appeared as the amount of Dy2O3 increased. It can be explained that the grain growth behavior of the Dy2O3 added-BaTiO3 occurs due to the two-dimensional nucleation and growth, and is governed by the interface reaction. Further, the correlation between crystal structure, microstructure, and dielectric properties was discussed.
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