Abstract
Mixed Cu(In${}_{x}$Cr${}_{1\ensuremath{-}x}$)P${}_{2}$S${}_{6}$ crystals of ferrielectric CuInP${}_{2}$S ${}_{6}$ and antiferroelectric CuCrP${}_{2}$S${}_{6}$ were investigated by means of broadband dielectric spectroscopy (10 mHz--3 GHz), for several values of $x$. The phase boundary between the ferrielectric phase and the dipolar glass state was found to lie between 0.5 and 0.7, and a similar boundary between the dipolar glass state and the antiferroelectric phase is observed to be located between 0.4 and 0.2. The dipole freezing results in a broad distribution of the relaxation times. The parameters of the double-well potentials, the local polarization distribution function, and glass order parameter have been extracted from the dielectric measurements. From these results the complete phase diagram has been constructed.
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