Abstract
Brillouin scattering spectra of perovskite-type crystal CsPbCl 3 have been measured above its cubic-tetragonal phase transition temperature, T c =47^° C . The three elastic constants c 11 , c 12 and c 44 were determined in a wide temperature range. The result agrees quite well with that of the previous ultrasonic measurement. This fact shows that there is no detectable elastic dispersion between 10 7 Hz and 10 10 Hz. An analysis using a single relaxation time model shows that the elastic relaxatuon time is shorter than 1 ×10 -11 sec at T = T c +3^° C . The soft-mode model rather than the order-disorder one seems to be more appropriate to a description of the cubic-tetragonal phase transition in this crystal.
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