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Article Dans Une Revue Zeitschrift für Kristallographie Année : 2005

The high-pressure structural phase transitions of sodium bismuth titanate

Résumé

The crystal structure of sodium bismuth titanate, Na0.5Bi0.5TiO3, as a function of pressure is reported. From a combination of neutron powder diffraction experiments using the instrument POLARIS at the ISIS pulsed neutron facility and synchrotron X-ray powder diffraction experiments at ID30 at ESRF, it is found that the rhombohedral ambient pressure perovskite structure (space group R3c on average) transforms to a lower-symmetry structure which has a strong resemblance to the CaTiO3 structure and is described by space group Pnma, at 40 kbar and above. A new refinement of earlier angle-dispersive neutron data collected at ambient pressure and temperature at D2B of the ILL, which gives Bi—O bond-lengths closer to the values suggested by subsequent EXAFS experiments, is also reported. This yields a model for disorder on the bismuth site within the ambient-pressure phase, average symmetry R3c, with locally triclinic displacements of the Bi atom off the (pseudocubic) [111] direction along the (pseudocubic) [10-1] direction.

Domaines

Matériaux
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Dates et versions

hal-00333277 , version 1 (22-10-2008)

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Citer

Pamela A. Thomas, Jens Kreisel, A. Michael Glazer, Pierre Bouvier, Quangzhong Jiang, et al.. The high-pressure structural phase transitions of sodium bismuth titanate. Zeitschrift für Kristallographie, 2005, 220 (8), pp. 717-725. ⟨10.1524/zkri.220.8.717.67071⟩. ⟨hal-00333277⟩
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