Abstract
AbstractTemperature‐dependent first‐order Raman scattering studies in the range 30–290 K were carried out in LiCsSO4 in order to investigate its phonon spectra in relation to the phase transitions in the crystal. Complete spectra were obtained for the z(xx)y and z(xz)y geometries. A careful analysis of the spectra shows that both the low‐ and high‐energy Raman modes exhibit variations either in frequency or intensity or both with temperature of the crystal, indicating that the D2k normal phase undergoes a transition at the Ti (202 K) and one to the commensurate phase at ca 160 K (Tc). Below the Tc, in the C2ν phase, the lattice mode at 44 cm−1 was observed to be a soft phonon with its frequency decreasing to 32 cm−1 at 30 K, indicating the possibility of a new structural phase transition of unlocking type in the crystal at a temperature Tu below 20 K. Another observation is the oscillating behaviour of Rayleigh scattering near the phase transition at the Ti.
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