Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Electrical and Optical Properties of Grain-Oriented (Pb, Ba, La) $Nb_2O_6$ Piezoelectric Ceramics

입자배향(Pb, Ba, La) $Nb_2O_6$ 압전세라믹스의 제작 및 그 전기적.광학적 특성

  • 남효덕 (영남대학교 공과대학 전자공학과) ;
  • 조상희 (경북대학교 공과대학 재료공학과) ;
  • 영전방유 (일본 방위대학교 전기공학교실)
  • Published : 1988.03.01
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Abstract

Ba or La-Substituted lead niobate $(Pb_{1-x}Ba_x)_{1-y}La_{2y/3}Nb_2O_6$(PBLN), powders having needle shape are prepared by flux method using KCl and the effect of Ba or La substitution on morphology of obtained powders is examined. From these needle shape powders, grain-oriented ceramics are made by doctor-blade method and two-stage hot-pressing technique. The dielectric, piezoelectric and optical properties of the ceramics are also investigaated. Heating condition and the amount of substituted Ba or La have remarkable effects have large anisotropy in both permittivity and coupling factor depending on the pressing direction.

KCI을 사용한 용융염합성법에 의해 침상형$(Pb_{1-x}Ba_x)_{1-y}La_{2y/3}Nb_2O_6$ (PBLN)분말을 합성하고 합성분말의 형상에 미치는 Ba 및 La 치환의 영향을 조사하였다. 또 이 침상형 분말을 사용하여 doctor-blade법 및 hot-press 법에 의해 입자배향 세라믹스를 제작하고 유전적, 압전적, 광학적 성질을 조사하였다. 얻어진 PBLN 분말의 형상 및 입자배향 PBLN 세라믹스의 전기적 특성은 분말합성시의 열처리조건과 Ba 및 La 치환량에 따라 현저히 달랐다. 특히 PBLN 세라믹스의 유전율 및 전기기계결합계수는 입자배향 세라믹스 제작시의 가압방향에 따라 뚜렷한 이방성을 나타내었다.

Keywords

References

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