A comprehensive study of the phase diagram of KxNa1−xNbO3

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, hi...

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Veröffentlicht in:Applied physics letters 2009-08, Vol.95 (9)
Hauptverfasser: Baker, D. W., Thomas, P. A., Zhang, N., Glazer, A. M.
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3212861