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J. Korean Ceram. Soc. > Volume 41(12); 2004 > Article
Journal of the Korean Ceramic Society 2004;41(12): 929.
doi: https://doi.org/10.4191/kcers.2004.41.12.929
MgO 졸로 표면개질된 PMN-PT-BT 분말의 소결 및 유전특성
임경란, 김창삼
한국과학기술연구원 재료연구부
Sintering of Surface-Modified PMN-PT-BT Powder with MgO Sol and Its Dielectric Properties
Kyoung-Ran Han, Chang-Sam Kim
Division of Materials Science and Technology, Korea Institute of Science and Technology
ABSTRACT
It is known that small amount of MgO in excess is often added to develop pure perovskite single phase of PMN-based composite, however, extra MgO precipitates in grains and inhibits densification of PMN. In this study PMN-PT-BT (PBT) powder was prepared by a conventional mixed oxide method using $(MgCO_3)_4{cdot}Mg(OH)_2{cdot}5H_{2}O$ instead of MgO. The precursor was heated at $500^{circ}C/1h$ and its surface was modified with MgO sol. This effect was investigated in the aspects of sintering and dielectric properties. Small amount of added MgO sol ($0.5{sim}1.0wt%$) enhanced sintering substantially below $1000^{circ}C$. The PBT with $0.5wt%$ MgO sol sintered at $900^{circ}C/2h$ had density of $7.62;g/cm^3$, room temperature dielectric constant of 14800, loss of dielectric constant of $1.1%$, which were comparable to those of the PBT sintered at $1000^{circ}C/2h$. It was noticeable that the extra MgO precipitated mostly on triple points and grain boundaries and resulted in inhibition of grain growth.
Key words: FMN-PT-BT, Magnesia sol, Surface-modification, Single phase perovskite, Grain growth
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