Abstract
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 substantially with increasing temperature due to high mobility of Cs+ ion. Transition to higher symmetry structure was noticed above 940K and the corresponding changes in the phonon spectra were observed.
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