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Polarized far-infrared reflection spectra of the CsCuCl3 single crystal have been recorded with the electric vector parallel and perpendicular to the c axis at room temperature. Polarized far-infrared transmission spectra have been measured at liquid-nitrogen temperature. The observed spectra have been interpreted using the factor group analysis based on the space group D62. Far-infrared transmission spectra of the powder sample have also been measured over the temperature range from 175 °C to liquid-nitrogen temperature. The spectrum at 175 °C consists of five bands and reveals a typical feature characteristic of the CsNiCl3 structure (D6h4). The spectral change due to the phase transition has been interpreted based on the structural distortion of the crystal.
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Akiyama et al. (1979) studied this question.
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