This article is cited in 10 papers

Phase transitions

Raman spectroscopic study of the lattice dynamics in the Rb$_2$KMoO$_3$F$_3$ oxyfluoride

A. S. Krylov^a, E. M. Merkushova^a, A. N. Vtyurin^a, L. I. Isaenko<sup>b

a</sup> L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^b Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk

Abstract: 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 $T\approx$ 185 K with decreasing temperature. 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$_3$ oxyfluoride shows that the phase transition is related to variations in the [MoO$_3$F$_3$]$^{3-}$ molecular octahedron.

Received: 15.11.2011

 English version: Physics of the Solid State, 2012, 54:6, 1275–1280

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