The complex dielectric constants of K 2 SeO 4 and Rb 2 ZnCl 4 have been measured in the frequency range from 5 MHz to 900 MHz around the incommensurate-commensurate phase transition points T c . It has been found that for both substances the relaxation frequencies are about 100 MHz at T c and increases gradually with increasing temperature in the incommensurate phase. The dielectric relaxation of both substances could be described by a polydispersive process.
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Horioka et al. (1980) studied this question.