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- W2001434059 abstract "Rhombohedral KAsF6 II (distorted CsCl-type) transforms at 101·5°C to a high-temperature phase KAsF6 I which is cubic, space group Fm3m (NaCl-type), with a0 = 8·050 Å at 124°C. The anions are highly disordered in KAsF6 I, and it it probable that the fluorine atoms are offset from, and rotate about, the lines connecting the heavy atoms. The thermal expansion parameters of KAsF6 II and I were measured in the range 21–314°C. The volume change upon transition 1̃2%. The II/I transition temperature increases steeply with pressure to 20 kbar. The i.r. and Raman spectra of these phases were studied in the range 150 to −190°C, and polarized Raman spectra of single-crystal KAsF6 II were obtained at 25°C. There is some evidence that the vibrational spectra of KAsF6 I show splitting similar to KPF6 I. This is consistent with tilting of the AsF bonds away from the crystal axes. The vibrational spectra of KAsF II are consistent with the space group R3. The force constants of the AsF6- ion were calculated for a number of different force fields." @default.
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- W2001434059 date "1975-09-01" @default.
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- W2001434059 title "Vibrational spectra, high-pressure polymorphism and force constants of KAsF6" @default.
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- W2001434059 doi "https://doi.org/10.1016/0584-8539(75)80186-3" @default.
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