Crystal structure and phase transitions of sodium potassium niobate perovskites |
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Authors: | J Tellier B Malic B Dkhil D Jenko J Cilensek M Kosec |
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Institution: | 1. Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia;2. Laboratoire Structures, Propriétés et Modélisation des Solides, CNRS-UMR 8580, Ecole Centrale Paris, Grande voie des vignes, 92925 Châtenay-Malabry, France |
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Abstract: | This paper presents the crystal structure and the phase transitions of KxNa1?xNbO3 (0.4 ≤ x ≤ 0.6). X-ray diffraction measurements were used to follow the change of the unit-cell parameters and the symmetry in the temperature range 100–800 K. At room temperature all the compositions exhibited a monoclinic metric of the unit cell with a small monoclinic distortion (90.32° ≤ β ≤ 90.34°). No major change of symmetry was evidenced in the investigated compositional range, which should be characteristic of the morphotropic phase-boundary region. With increasing temperature, the samples underwent first-order monoclinic–tetragonal and tetragonal–cubic transitions. Only the potassium-rich phases were rhombohedral at 100 K. |
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