Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Microstructure and Dielectric Properties of (Sr·Ca)TiO3-based Ceramics Exhibiting Nonlinear Characteristics

비선형 특성을 갖는 (Sr·Ca)TiO3계 세라믹의 미세구조 및 유전 특성

  • 최운식 (대불대학교 전기공학과) ;
  • 강재훈 (대불대학교 전기공학과) ;
  • 박철하 (대불대학교 컴퓨터정보공학부) ;
  • 김진사 (광운대학교 전기공학과) ;
  • 조춘남 (광운대학교 전기공학과) ;
  • 송민종 (광주보건대 의료정보공학과)
  • Published : 2002.01.01
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Abstract

In this paper, the microstructure and the dielectric properties of Sr$\_$1-x/CaxTiO$_3$(0$\leq$x$\leq$0.2)-based grain boundary layer ceramics were investigated. The sintering temperature and time were 1420∼152 0$\^{C}$ and 4 hours in N$_2$ gas, respectively. The average grain size and the lattice constant were decreased with increasing content of Ca, but the average grain size was increased with increase of sintering temperature. The second phase foamed by the thermal diffusion of CuO from the surface leads to verb high apparent dielectric constant, $\xi$$\_$r/>50000 and low dielectric loss, tan$\delta$<0.05. X-ray diffraction patterns of Sr$\_$1-x/CaxTiO$_3$ exhibited cubic structure, and the peaks shifted upward and the peak intensity were decreased with x. This is due to the lattice contraction as Sr is replaced by Ca with a smaller ionic radius. The specimens treated thermal diffusion for 2hrs in 1150$\^{C}$ exhibited nonlinear current-voltage characteristic, and its nonlinear coefficient(a) was overt 7.

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References

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