Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of Excess and Deficiency of PbO on the Sintering and Electrical Properties of PZT Ceramics

PbO 과잉 및 결핍이 PZT 세라믹스의 소결 및 전기적 특성에 미치는 영향

  • 임진호 (경북대학교 무기재료공학과) ;
  • 김진호 (경북대학교 무기재료공학과) ;
  • 조상희 (경북대학교 무기재료공학과)
  • Published : 1994.06.01
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Abstract

Effect of excess and deficiency of PbO on the sintering and electrical properties of tetragonal Pb(Zr0.5Ti0.5)O3 were investigated. Fired density revealed maximum value with 4 wt% of excess PbO, and decreased with increasing amount of both excess and deficient PbO. Grain size increased with excess PbO, and decreased with deficiency of PbO. It appeared that excess PbO forms a liquid phase to enhance grain growth and completely volatilizes after sintering, whereas ZrO2 particles formed in PbO-deficient PZT inhibit grain growth. The change in the values of the equivalent circuit elements of PZT corresponded well with thar of porosity formed by excess and deficiency of PbO; kp, Co and Cm decreased while Qm, Rm and Lm increased conosiderably with porosity. This change was more pronounced in PbO-deficient type probably due to change in Zr/Ti ratio of PZT.

Keywords

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