Raman Scattering Study of Rb₃H(SeO₄)₂ Single Crystal in High Temperature Phases

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Raman scattering from a single crystal of Rb₃H(SeO₄)₂ has been observed in the frequency range between 20cm^-1 and 1000cm^-1 at phases I (482.6K, 466.8K, 443.3K) and II (391.2K, 301.2K, 78.6K). The measured spectra in phase II were assigned to the normal modes of SeO₄ tetrahedra vibration. In phase I, this compound shows high electric conductivity due to the hopping of protons. A new Raman line has been found at 826cm^-1 in this high temperature phase. It is suggested that this line is caused by the stretching mode of a single Se--O bond in SeO₄ tetrahedra, accompanied by destruction and reconstruction of hydrogen bonds.