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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The Effect of Sintering Time in the Microstructure and Electric Conductivity of $(Gd_2O_3)_{0.05}(Y_2O_3)_{0.05}(ZrO_2)_{0.9}$ System

$(Gd_2O_3)_{0.05}(Y_2O_3)_{0.05}(ZrO_2)_{0.9}$계의 소결시간에 따른 미세구조와 전기전도도

  • 임용무 (광주보건대학 안경광학과) ;
  • 장복기 (전남대학교 세라믹공학과) ;
  • 신동선 (전남대학교 세라믹공학과) ;
  • 김동근 (전남대학교 금속공학과) ;
  • 김종빈 (조선대학교 전자공학과) ;
  • 윤성도 (동아전문대학 전기공학과)
  • Published : 1998.12.01
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Abstract

In this study, the microstructure and electric conductivity of 5mol% $Gd_2O_3$-5mol% $Y_2O_3-ZrO_2$ system(5G5YZ) with a variation of sintering time at $1600^{\circ}C$ were investigated. By the result of TEM analysis of 5G5YZ sintered for 12h, a microcrack was observed near grain boundary. The change of the sintering time did not affect the lattice conductivity, but the grain boundary contribution was varied with the sintering time. The grain boundary conductivity of the sample sintered for 1h showed the highest value. Furthermore, the activation energy of the total conductivity was independent upon the sintering time and showed approximately 1.01eV. The highest conductivity measured at $1000^{\circ}C$ was 0.0197S/cm with the sample sintered for 1h. Comparing to 0h’s, the thickness ration of grain boundary as a function of sintering time were 0.88, 1.11 and 1.29 for 1h, 5h and 12h, respectively. In case of the sample sintered for 1h, the thickness of the grain boundary showed the lowest value. The increase of the sintering time over 1h made the decrease of the electric conductivity as well as the increase of the grain growth and the thickness of the grain boundary. As a result, it seemed that the proper sintering time for 5G5YZ composition was 1h.

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