Thermodynamic Investigations of the Phase Transition in Ferroelastic CoZrF<sub>6</sub>

Горев, М. В.; Flerov, I. N.; Tressaud, A.; Grannec, J.; Rodriguez, Vincent; Couzi, M.

doi:10.1002/pssb.2221690108

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“…Such phase transitions were the subject of the work of Reinen & Steffens (1978). Especially CoZrF6 and ZnZrF6 were extensively investigated by Rodriguez, Couzi, Tressaud, Grannec, Chaminade & Soubeyroux (1990), Rodriguez, Couzi, Tressaud, Grannec, Chaminade & Ecolivet (1990), Rodriguez, Couzi, Sourisseau, Tressaud, Grannec, Chaminade, Soubeyroux & Ecolivet (1991) and Gorev, Flerov, Tressaud, Grannec, Rodriguez & Couzi (1992). The Fm3m ~ R3 phase transition is described by means of Landau theory .…”

Section: Introductionmentioning

confidence: 99%

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

Sowa¹

1997

Acta Crystallogr Sect B

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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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Section: Introductionmentioning

confidence: 99%