期刊
APPLIED PHYSICS LETTERS
卷 95, 期 9, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3212861
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资金
- Advantage West Midlands (AWM)
- European Regional Development Fund (ERDF)
- EPSRC [EP/G026696/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G026696/1] Funding Source: researchfish
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]
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