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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Structural and Dielectric Properties of (Sr.Ca)$TiO_3$-based Ceramics with the Substitution of Ca

Ca 치환에 따른 (Sr.Ca)$TiO_3$계 세라믹스의 구조적 및 유전 특성

  • 최운식 (대불대학교 전기공학과) ;
  • 강재훈 (대불대학교 전기공학과) ;
  • 서용진 (대불대학교 전기공학과) ;
  • 김창일 (중앙대학교 전기전자공학부) ;
  • 김충혁 (광운대학교 전기공학과) ;
  • 박용필 (동신대학교 전기전자공학부)
  • Published : 2001.11.01
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Abstract

In this paper, the structural and dielectric properties of (Sr$_{l-x}$Ca$_{x}$)TiO$_3$ (0$\leq$x$\leq$0.2) -based grain boundary layer ceramics were investigated by XRD, SEM and HP4194A. The ceramics were fabricated by the conventional mixed oxide method. The sintering temperature and time were 1420~152$0^{\circ}C$ and 4 hours, respectively. The average grain size and the lattice constant were decreased with increasing content of Ca. The average grain size was increased with increase of sintering temperature. The relative density of all specimens was 96~98%. The 2nd Phase formed by the thermal diffusion of CuO from the surface leads to very excellent dielectric properties, that is, $\varepsilon$$_{r}$>50000, tan $\delta$<0.05, $\Delta$C<$\pm$10%. The appropriate Ca content was under 15 ㏖%.s under 15 ㏖%.%.

Keywords

References

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