INCOMMENSURATION IN LA-MODIFIED ANTIFERROELECTRIC LEAD-ZIRCONATE-TITANATE CERAMICS

被引：35

作者：

XU, Z ^{[1
]}

DAI, XH ^{[1
]}

VIEHLAND, D ^{[1
]}

机构：

[1] UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801

来源：

APPLIED PHYSICS LETTERS | 1994年 / 65卷 / 25期

关键词：

D O I：

10.1063/1.112441

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Lanthanum-modified lead zirconate titanate (PLZT) specimens with a La content of 2 at. % and a Zr/Ti ratio of 95/5 (PLZT 2/95/5) have been investigated by dielectric spectroscopy, Sawyer-Tower polarization (P-E) measurements, and hot-stage transmission electron microscopy (TEM). La "impurities" have been found to induce a 1/x〈110〉 incommensurate antiferroelectric structure at about 210°C from a ferroelectric structure when cooled from above. The incommensurate structure was found to be stable below this temperature of the dielectric maximum, evolving slowly with decreasing temperature towards the commensurate antiferroelectric orthorhombic PZ structure. The incommensuration is believed to arise due to a competition between "broken" dipolar (ferroelectric) and sublattice (antiferroelectric) interactions. The "dirty" antiferroelectric Pb-based system may be the first example of a proper incommensurately displacively modulated ferroelectric-type material. © 1994 American Institute of Physics.

引用

页码：3287 / 3289

页数：3

共 6 条

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