Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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A Study on the Grain Growth and PLZT Ceramics Fabrication by Freeze Drying Method.

동결건조법에 의한 PLZT 세라믹 제조 및 결정립 성자에 관한 연구.

  • Lee, Sung-Gap (Kwang-Woon University, Department of Electronic Materials Engineering) ;
  • Ryu, Ki-Won (Kwang-Woon University, Department of Electronic Materials Engineering) ;
  • Lee, Young-Hie (Kwang-Woon University, Department of Electronic Materials Engineering)
  • 이성갑 (광운대학 전자재료공학과) ;
  • 류기원 (광운대학 전자재료공학과) ;
  • 이영희 (광운대학 전자재료공학과)
  • Published : 1987.11.20
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Abstract

In this study, PLZT ceramics were fabricated by freeze-drying and normal sintering method. The compositional rate of specimen was selected 9/65/35 (La/Zr/Ti) which have good optical and dielectric properties, sintering time was varied 1, 10, 30, 40, 50, 55, 60 and 65 hr at $1250^{\circ}C$. After sintering, the optical and dielectric properties were investigated with the grain size. As the result of the experiment, freeze-dried powder appeared particle size less than 1 um. The relative dielectric constant was increased linearly with the sintering time, specimen which sintered for 65 hr had the highest value, 5780. Grain was grown with increasing time, in the case of specimen sintered for 60 hr, the grain size was 8.4 um. Transmittance was increased with the grain size. In the case of 8.4 um grain size, the transmittance was 56 %. Curie temperature was decreased linearly by the surface-layer effect of space-charge, in the case of grain size which were 1.8 um and 8.4 um, appeared at $100^{\circ}C$ and $80^{\circ}C$, respectively.

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