Abstract
The infrared absorption spectra of the oxyfluoride Rb2KMoO3F3 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 MoO3F3 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).
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Original Russian Text © Yu.V. Gerasimova, A.S. Oreshonkov, A.N. Vtyurin, A.A. Ivanenko, L.I. Isaenko, A.A. Ershov, E.I. Pogoreltsev, 2013, published in Fizika Tverdogo Tela, 2013, Vol. 55, No. 11, pp. 2215–2217.
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Gerasimova, Y.V., Oreshonkov, A.S., Vtyurin, A.N. et al. Infrared absorption investigation of the role of octahedral groups upon the phase transition in the Rb2KMoO3F3 crystal. Phys. Solid State 55, 2331–2334 (2013). https://doi.org/10.1134/S1063783413110097
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DOI: https://doi.org/10.1134/S1063783413110097