PZT的另一种热力学模型

Proceedings of the 13th IEEE International Symposium on Applications of Ferroelectrics, 2002. ISAF 2002. Pub Date : 2002-05-28 DOI:10.1109/ISAF.2002.1195860

A. Bell, E. Furman

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引用次数: 3

摘要

提出了一个热力学模型来解释在固溶体体系Pb(Zr/sub - 1-x/Ti/sub -x/)O/sub - 3/中观察到的单斜相。自由能包括三组项:两个极化展开，一个代表每个端元，相对于组成线性加权，以及两个贡献之间的耦合项。利用先前公布的PbTiO/sub - 3/系数和从富锆PZT成分中推断出的PbZrO/sub - 3/的值，计算预测了菱形相和四方相之间的亲形相边界的组成在x=0.45处，并且几乎与温度和两级参数之间的耦合强度无关。单斜相的存在范围取决于耦合的强度，但一般来说，在低温下是最宽的。

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An alternative thermodynamic model for PZT

A thermodynamic model is proposed to account for the monoclinic phase observed in the solid solution system Pb(Zr/sub 1-x/Ti/sub x/)O/sub 3/. The free energy comprises three sets of terms: two expansions of polarization, one representing each of the end-members, weighted linearly with respect to composition, and terms representing the coupling between the two contributions. Employing previously published coefficients for PbTiO/sub 3/ and values extrapolated from Zr-rich PZT compositions for PbZrO/sub 3/, calculations predict the composition of the morphotropic phase boundary between the rhombohedral and tetragonal phases lies at x=0.45 and is virtually independent of temperature and the strength of coupling between the two order parameters. The range of existence of the monoclinic phase depends upon the strength of the coupling, but in general, is broadest at low temperature.

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Proceedings of the 13th IEEE International Symposium on Applications of Ferroelectrics, 2002. ISAF 2002.

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