Raman spectra of Rb 2 ZnBr 4 were measured in the temperature region including the normal-incommensurate ( T i =73°C) and incommensurate-commensurate ( T c =-86°C) phase transition points. At the optical geometries of c ( a a ) b and a ( c c ) b , a soft mode has been observed whose frequency shift decreases as T i is approached from below. At the geometry of a ( c a ) b , the change in the Rayleigh wing has been observed on passing. through T c . Detailed measurements with an I 2 -filter were also made.
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Takashige et al. (1980) studied this question.
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