Abstract
The structural phase transition of cecium nitrate,CsNO 3 , has been investigated by means of Brillouin scattering. Brillouin shifts of transverse acoustic phonons traveling along any axes had extremely larger jumps at the transition temperature (T c ) than those of the longitudinal ones. These jumps at T c were the largest for any other crystals to our knowledge. Moreover, they jumped upward at T c with decreasing temperature, which was inverse for the results of usual phase transition theory. These results indicated that the phase transitions of CsNO 3 were of extremely strong first order. These causes are discussed to consider the mechanics of the phase transition.
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