Abstract
The phase transition of CsNO3 has been studied by the Brillouin scattering. Temperature dependence of Brillouin spectra has shown almost similar behavior for acoustic phonons propagating along three directions [001]h, [101]h, and [100]h in hexagonal axes. At Tc, jumps of Brillouin shifts were very large, especially for 45° oblique phonon. This results from the fact that Brillouin shifts were estimated to have a minimum for the phonon propagating along the axial direction [100]c in the cubic phase and the maximum for the same direction in the trigonal phase.
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