• Title, Summary, Keyword: Partial oxalate method

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Electrical Properties of PZT Ceramics Fabricated by Partial Oxalate Method at Low Sintering Temperature (부분수산법에 의한 PZT 세라믹스의 저온소성과 전기적 제특성)

  • Nam, Hyo-Duk;Choi, Se-Gon;Lee, Hee-Young
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.38-41
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    • 1992
  • Pb(Zr,Ti)$O_3$ powders were synthesized by the partial oxalate method and the modified partial oxalate method, where the difference between the two is the use of pre-reacted (Zr,Ti)$O_2$ in the former method. When compared with conventional mixed oxide method, calcination temperature can be reduced to less than $700^{\circ}C$ by both partial oxalate methods, and the resulting particle size was finer and more uniform. Using partial oxalate-derived PZT powders, sintering temperatures can also be reduced as low as $950^{\circ}C$ without sacrificing desired dielectric and piezoelectric properties, such as relative permittivity, electromechanical coupling factor, and piezoelectric coefficient. Two partial oxalate methods yield ceramics with almost the same physical and electrical properties, so that the step of producing ZTO powder does not seem to be necessary.

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Microstructure and $Nb_2O_5$ Additive Effect of the PZT ceramics prepared by Partial Oxalate Method (부분수산법에 의해 제조된 PZT세라믹스의 미세구조와 $Nb_2O_5$ 첨가효과)

  • Kim, Tae-Joo;Nam, Hyo-Duk
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.657-661
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    • 2002
  • PZT powder was prepared by partial oxalate method using $(Zr_{0.53}Ti_{0.47})O_2$, $Pb(NO_3)_2$ and $(COOH)_2{\cdot}2H_2O$ as a precipitant. $Nb_2O_5$ additive effect on microstructure and piezoelectric properties of PZT ceramics were investigated. The coexistence of rhombohedral and tetragonal phases of PZT ceramics at the sintering temperature of $1100^{\circ}C$ was revealed from the X-ray diffraction patterns. The grain size PZT ceramics was decreased with the increase $Nb^{5+}$. and the sinterbility of PZT ceramics was decreased with the increase $Nb^{5+}$ addition. The electromechanical coupling factors $K_p$ show above 0.60 at $1100^{\circ}C$ sintering temperature by $Nb_2O_5$ addition above 0.6mol%.

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The Effect of Nb2O5 Addition on Properties of PZT Ceramics Prepared by Partial Oxalate Method (부분수산법으로 제조한 PZT세라믹스의 특성에 미치는Nb2O5 첨가효과)

  • 김태주;남효덕;이준형
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.1
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    • pp.33-38
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    • 2003
  • 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.

Low temperature firing and electrical properties of PZT ceramics prepared from partial oxalate method derived powders (부분수산법에 의한 PZT 세라믹스의 저온소성과 전기적 제특성)

  • 남효덕;이희영
    • Electrical & Electronic Materials
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    • v.6 no.2
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    • pp.168-174
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    • 1993
  • 두가지 부분수산법, 즉 부분수산법(1)과 수정된 부분수산법에 의해 합성한 미분말을 사용하여 PZT 세라믹스를 저온소성하고 그 전기적 제특성을 조사하였다. 두가지 부분수산법에 의해 합성한 분말의 소결거동을 조사해본 결과 고상반응법보다 훨씬 낮은 소결온도인 950.deg.C에서도 단일상의 페로브스카이트상이 얻어지고 치밀화가 이루어졌을 뿐만 아니라 비유전율, 전기기계 결합계수, 압전정수 등 유전 및 압전특성이 고상반응법에 비해 손색이 없었다. 특히 두가지의 부분수산법에 의해 얻어진 PZT 세라믹스는 물리적 전기적 제특성이 서로 비슷하게 나타났으며 이 결과로부터 부분수산법(1)에서 수반되는 ZTO 분말을 따로 합성하는 공정이 불필요한 수정된 부분수산법이 편리함을 알았다.

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