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- W1990232495 abstract "KPF6 I at ambient conditions is cubic, space group Fm3m, with eightfold disorder of the anions. At ∼0°C it transforms to KPF6 II, which appears to be rhombohedral and ordered. KPF6 II further transforms to KPF6 III at − 14·7°C. The III/II and II/I transition lines were studied as functions of pressure. The infrared and Raman spectra of these phases were studied in the range 50°C to −190°C, and polarized Raman spectra of single-crystal KPF6 I were obtained at 25°C. The vibrational spectra of KPF6 I are consistent with a disordered model where the PF bonds are tilted away from the crystal axes. The vibrational spectra of KPF6 II are not, however, consistent with either of the space groups R3m or R3, usually encountered for this formula type, and indicate a lower site symmetry for the anions. The vibrational spectra of KPF6 III indicate a complete lifting of all degeneracy as well as the failure of the rule of mutual exclusion." @default.
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- W1990232495 date "1974-01-01" @default.
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- W1990232495 title "Vibrational spectra and high-pressure polymorphism of KPF6" @default.
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- W1990232495 doi "https://doi.org/10.1016/0584-8539(74)80215-1" @default.
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