Yu. V. Gerasimova, A. S. Oreshonkov, A. N. Vtyurin, A. A. Ivanenko, L. I. Isaenko, A. A. Ershov, E. I. Pogoreltsev, “Infrared absorption investigation of the role of octahedral groups upon the phase transition in the Rb$_2$KMoO$_3$F$_3$ crystal”, Fizika Tverdogo Tela, 2013, Volume 55, Issue 11,Pages 2215

This article is cited in 12 papers

Lattice dynamics

Infrared absorption investigation of the role of octahedral groups upon the phase transition in the Rb$_2$KMoO$_3$F$_3$ crystal

Yu. V. Gerasimova^a, A. S. Oreshonkov^a, A. N. Vtyurin^a, A. A. Ivanenko^a, L. I. Isaenko^b, A. A. Ershov^a, E. I. Pogoreltsev^a

^a 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 infrared absorption spectra of the oxyfluoride Rb$_2$KMoO$_3$F$_3$ have been measured in the frequency range corresponding to stretching vibrations of the Mo–O anion octahedron with the purpose of clarifying their role in the phase transition. A semi-empirical calculation of two possible configurations of quasioctahedral MoO$_3$F$_3$ groups has been performed. The results of the investigations have demonstrated that some octahedra in the crystal structure change the local symmetry from $C_{3v}$ to $C_{2v}$ due to the phase transition ($T$ = 197 K).

Received: 15.04.2013