Abstract
The longitudinal (LO) and transverse (TO) A1 vibrational modes have been measured between 30-1200 cm−1 as a function of temperature (30–1240 K) for CsTiOAsO4 (CTA). The frequencies for all corresponding Raman components shifted to lower frequencies on increasing the temperature, however, there is no typical soft-mode like behavior observed in the measured frequency range. The relative intensities of the low frequency bands increase dramatically with increasing temperature due to high mobility of Cs+ ion. A higher symmetry structure taking place above 940K has been confirmed by changes in the phonon spectra.
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Guo, A.R., Tu, CS., Tao, R. et al. Temperature Dependent Raman Scattering in CsTiOAsO4 Single Crystal. MRS Online Proceedings Library 398, 661–666 (1995). https://doi.org/10.1557/PROC-398-661
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