Global and secondary ferroelectric minima in ordered Pb(Sc0.25Nb0.25Ti0.5)O3 alloys

被引：5

作者：

Al-Barakaty, A ^{[1
]}

Bellaiche, L ^{[1
]}

机构：

[1] Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA

来源：

APPLIED PHYSICS LETTERS | 2002年 / 81卷 / 13期

关键词：

D O I：

10.1063/1.1509473

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A first-principles-derived approach is developed to study properties of two Pb(Sc0.25Nb0.25Ti0.5)O-3 alloys that are both atomically ordered along the [001] direction. Unlike the first alloy, the second structure has differently-charged (001) B-planes. Both systems exhibit a global ferroelectric minimum of orthorhombic symmetry and a secondary ferroelectric minimum of tetragonal symmetry. Some electromechanical responses are enhanced in the secondary minimum, especially for the second structure. Mechanisms allowing a switch from the global to the secondary minimum are discussed. (C) 2002 American Institute of Physics.

引用

页码：2442 / 2444

页数：3

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