Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Sr/Ba Ratio Dependence of Dielectric Characteristics in Strontium Barium NiobateCeramics

Sr/Ba 비에 따른 Strontium Barium Niobate 세라믹스의 유전특성

  • 김명섭 (서울산업대학교 재료공학과) ;
  • 이준형 (서울산업대학교 재료공학과) ;
  • 김정주 (서울산업대학교 재료공학과) ;
  • 이희영 (영남대학교 재료금속공학과) ;
  • 조상희 (서울산업대학교 재료공학과)
  • Published : 2001.12.01
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Abstract

The tetragonal tungsten bronze type of Sr$_{x}Ba_{1-x}Nb_{2}O_{6}$(SBN) (0.3$\le$x$\ge$0.7) ceramics was synthesized by the solid state reaction method, and the dielectric properties of SBN ceramics as a function of Sr/Ba ratio were examined. With increasing Sr/Ba ratio in SBN ceramics, the Curie temperature decreased and the maximum dielectric constant at the Curie temperature increased. The relaxor behavior of the SBN ceramics as a function of Sr/Ba ratio was quantitatively evaluated. More relaxor behavior of dielectric characteristics was observed as the ratio of Sr/Ba increased. The experimental results are explained with a viewpoint of crystallography of tungsten bronze structured SBN ceramics.

텅스텐브론즈 구조를 가지는 Sr$_{x}Ba_{1-x}Nb_{2}O_{6}$(SBN) (0.3$\le$x$\ge$0.7) 세라믹스를 고상반응법으로 합성하고 Sr/Ba의 비에 따른 유전특성을 조사하였다. SBN 세라믹스는 Sr/Ba의 비가 증가함에 따라 상전이 온도는 낮아지고 상전이 온도에서의 최대 유전율은 증가하였다. 또한 SBN 세라믹스는 Sr 함량에 따른 relaxor 거동을 정량화하여 평가하였는데, Sr/Ba의 비가 증가할수록 유전율은 더욱 완만해지는 것을 관찰할 수 있었다. 이러한 실험 결과를 텅스텐브론지 구조를 가진 SBN 세라믹스의 결정구조 관점에서 해석하였다.

Keywords

References

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