Acta Crystallographica Section B

Structural Science

Volume 53, Part 1 (February 1997)

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Acta Cryst. (1997). B53, 25-31    [ doi:10.1107/S010876819601066X ]

Pressure-Induced Fm-3m R-3 Phase Transition in NaSbF6

H. Sowa

Abstract: High-pressure X-ray diffraction measurements on NaSbF6 powder were performed up to 5.63 (7) GPa. At ~0.1 GPa the cubic low-pressure phase with ordered ReO3-type crystal structure undergoes a phase transition into a rhombohedral LiSbF6-type modification. The high-pressure behaviour of this phase is characterized by rotations and distortions of the coordination octahedra, but it also can be described with a sphere-packing deformation. The octahedral distortions are probably caused by cation-cation repulsions.

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