A comprehensive study of the phase diagram of KxNa1-xNbO3

被引：155

作者：

Baker, D. W. ^{[1
]}

Thomas, P. A. ^{[1
]}

Zhang, N. ^{[2
]}

Glazer, A. M. ^{[2
]}

机构：

[1] Univ Warwick, Dept Phys, Warwick CV4 7AL, England

[2] Univ Oxford, Dept Phys, Oxford OX1 3PU, England

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 09期

基金：

英国工程与自然科学研究理事会;

关键词：

CERAMICS;

D O I：

10.1063/1.3212861

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The phase diagram of lead-free piezoelectric KxNa1-xNbO3 has been studied, with particular focus on the proposed morphotropic phase boundaries, by powder and single crystal x-ray diffraction. The tilt system and cation displacement has been mapped out as a function of temperature and composition, highlighting changes in the oxygen octahedra at x=0.2 and x=0.4 at room temperature. The orthorhombic to monoclinic boundary at x=0.5 has been investigated, with a subtle change in the structure observed. The conclusion is that KxNa1-xNbO3 does not display a morphotropic phase boundary comparable with that in lead zirconate titanate, and that the most significant structural change as a function of composition occurs at x=0.2 because of the change of the tilt system. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3212861]

引用

页数：3

共 23 条

[1] LATTICE-PARAMETERS AND TILTED OCTAHEDRA IN SODIUM-POTASSIUM NIOBATE SOLID-SOLUTIONS [J].