The vibration spectrum and structural phase transitions in cesium–bismuth molybdate

The vibrational IR spectra of a CsBi(MoO4)2 crystal have been studied in the temperature range 16−300° K in polarized radiation (E‖b, E‖c) in the frequency range 600−1000 cm−1. The influence of structural phase transitions (Tc1 = 135° K, Tc2 = 330° K) on the IR reflection spectra of CsBi(MoO4)2 has been found. By comparing the vibration spectrum of CsBi(MoO4)2 with the spectra of CsDy(MoO4)2 crystals which were studied earlier, the symmetry of the low-temperature phase was established. It was established that below Tc2 and Tc1 the symmetries of the low-temperature phases are D2h8 and Ci1, respectively.

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