A comprehensive study of the phase diagram of KxNa1-xNbO3
A comprehensive study of the phase diagram of KxNa1-xNbO3
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DOI：
10.1063/1.3212861
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发表时间：
2009-08-31
影响因子：
4
通讯作者：
Glazer, A. M.
中科院分区：
文献类型：
--
作者：
Baker, D. W.;Thomas, P. A.;Glazer, A. M.
无铅压电KxNa 1-xNbO 3的相图进行了研究，特别侧重于拟议的准同型相界，通过粉末和单晶X射线衍射。倾斜系统和阳离子位移已被映射出作为温度和组成的函数，突出在室温下在x=0.2和x=0.4的氧八面体的变化。研究了x=0.5时的斜方晶系到单斜晶系的边界，观察到结构的细微变化。的结论是，KxNa 1-xNbO 3不显示一个准同型相界的锆钛酸铅相比，最显着的结构变化作为一个功能的组合物发生在x=0.2，因为倾斜系统的变化。(C)2009年美国物理学会。[DOI：10.1063/1.3212861]
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]