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

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.

-1