The lattice dynamics of the Rb 2 KMoO 3 F 3 oxyfluoride has been studied by Raman spectroscopy in the temperature range 7-400 K. A phase transition has been revealed at T ≈ 185 K with decreasing tem perature. Anomalies of the frequencies and Raman line half widths have been analyzed. No condensation of soft lattice modes has been found. The character of changes in the Raman spectra of the Rb 2 KMoO 3 F 3 oxy fluoride shows that the phase transition is related to variations in the [MoO 3 F 3 ] 3-molecular octahedron.
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