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부분수산법으로 제조한 PZT세라믹스의 특성에 미치는Nb2O5 첨가효과

The Effect of Nb2O5 Addition on Properties of PZT Ceramics Prepared by Partial Oxalate Method

  • 김태주 (영남대학교 전자공학과) ;
  • 남효덕 (영남대학교 전자공학과) ;
  • 이준형 (경북대학교 무기재료공학과)
  • 발행 : 2003.01.01

초록

Highly homogeneous PZT powder was prepared by a partial oxalate method using chemicals of (Z $r_{0.53}$ $Ti_{0.47}$) $O_2$, Pb(N $o_3$)$_2$and (COOH)$_2$ㆍ2$H_2O$. N $b_2$ $O_{5}$ addition effect on microstructure and electrical properties of PZT ceramics was investigated. When the precursors were calcined at 71$0^{\circ}C$, a single perovskite phase was obtained. After sintering at 110$0^{\circ}C$, X-ray diffraction Patterns showed coexistence of rhombohedral and tetragonal phases regardless of the N $b_2$ $O_{5}$ content. As the content of N $b_2$ $O_{5}$ increased, grain size decreased but sintered density increased. The electromechanical coupling factor of kp and the piezoelectric constant of $d_{31}$ increased linearly with the content of N $b_2$ $O_{5}$, and those values reached 0.7 and -200, respectively, when 1.2 mol% of N $b_2$ $O_{5}$ is added. is added.ded.

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