Effects of Chemical Inhomogeneity on Phase Coexistence in Pb(Zr, Ti))<TEX>$O_3$</TEX> Ceramics at Morphotropic Tetragonal and Rhombohedral Phase Boundary

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J. Korean Ceram. Soc. > Volume 27(8); 1990 > Article

Journal of the Korean Ceramic Society 1990;27(8): 1027.

정방정상과 능면체상의 경계조성 Pb(Zr, Ti)$O_3$ 세라믹스에서 화학조성의 불균일성이 상공존에 미치는 영향

천채일, 김호기

한국과학기술원 재료공학과

Effects of Chemical Inhomogeneity on Phase Coexistence in Pb(Zr, Ti))$O_3$ Ceramics at Morphotropic Tetragonal and Rhombohedral Phase Boundary

ABSTRACT

In order to identify the origin of phase coexistence at morphotropic tetragonal and rhombohedral boundary in PZT ceramics, the effect of chemical inhomogeneity on phase coexistence region was investigated. Two kinds of PZT ceramics with different chemical homogeneity were prepared by conventional solid state reaction and co-precipitation method. There was coexistence of tetragonal and rhombohedral phase over a wide composition range in PZT ceramics calcined by solid state reaction, and there was also phase coexistence of which region was reduced considerably in sintered samples. And phase coexistence region was not observed in co-precipitated PZT ceramics(within 1 mole%). Therefore compositional fluctuation is considered to be major origin of the phase coexistence at morphotropic phae boundary in PZT ceramics.