Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Influences of ${Nb_2}{O_5}$ and MnO Addition on the Electrical Properties of ${Pb_{0.6}}{Sr_{0.4}}{TiO_3}$Semiconducting Ceramics

${Nb_2}{O_5}$와 MnO 첨가가 ${Pb_{0.6}}{Sr_{0.4}}{TiO_3}$ 반도체 세라믹의 전기적 특성에 미치는 영향

  • Moon, Jung-Ho (Research Division of Chemistry and Molecular Engineering, Department of Chemistry, Korea University, Materials Science and Technology Division, Korea Institute of Science and Technology) ;
  • Kim, Keon (Research Division of Chemistry and Molecular Engineering, Department of Chemistry, Korea University, Materials Science and Technology Division, Korea Institute of Science and Technology) ;
  • Kim, Seong-Ho (Research Division of Chemistry and Molecular Engineering, Department of Chemistry, Korea University, Materials Science and Technology Division, Korea Institute of Science and Technology) ;
  • Kim, Yoon-Ho (Research Division of Chemistry and Molecular Engineering, Department of Chemistry, Korea University, Materials Science and Technology Division, Korea Institute of Science and Technology)
  • 문정호 (고려대학교 화학과, 한국과학기술연구원 재료연구부) ;
  • 김건 (고려대학교 화학과, 한국과학기술연구원 재료연구부) ;
  • 김성호 (고려대학교 화학과, 한국과학기술연구원 재료연구부) ;
  • 김윤호 (고려대학교 화학과, 한국과학기술연구원 재료연구부)
  • Published : 2000.10.01
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Abstract

Nb$_2$O$_{5}$와 MnO 첨가에 따른 Pb$_{0.6}$Sr$_{0.4}$TiO$_3$반도체 세라믹의 미세구조와 전기적 특성은 유전특성, I(current)-V(voltage) 측정, 그리고 복소 임피던스 측정 등을 이용하여 고찰하였다. Nb 도핑량이 0.4 mol% 이하인 경우 Nb 도핑량에 따라 전도성과 입성장은 증가되었으나 그 이상의 도핑량에서는 Sr이나 Pb 공공의 생성으로 인하여 전도성이 감소되고 입성장도 억제되는 것을 관찰할 수 있었다. 0.4 mol% Nb-doped Pb$_{0.6}$Sr$_{0.4}$TiO$_3$에 0.01 mol% MnO를 첨가한 경우 비저항비($ ho$$_{max}$/$\rho$/min/)가 $10^2$에서 $10^4$으로 크게 향상되었다. 그리고 전이 온도 주변에서 여러 개의 변곡점을 지니는 비옴성 거동이 발견되었다. 이와 같은 현상은 입계에 존재하는 Mn 이온이 부분적으로 편석되어 표면 전하의 보상 효과에 영향을 미치는 것이라고 사료된다.

Keywords

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