Abstract
The polarized Raman spectra of BaZnGeO 4 crystal were measured at various geometrical arrangements corresponding to A(TO), E 1 (TO)+E 1 (LO) and E 2 representations over the temperature range 440°C∼-110°C, which covers the whole phases except for the phase I. In the low-frequency region below 300 cm -1 , the spectral feature varies depending upon temperature and a characteristic pattern of Raman spectrum for each phase is clarified. The spectral change due to the II-III phase transition appears continuous, in agreement with the second order nature. No spectral change is observed in the III-IV transition. The phase transition IV-V is clearly distinguished in the Raman spectra by an abrupt change of several bands and a thermal hysteresis, which reflects the first order nature.
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