Single crystals of K 2 ZnI 4 with monoclinic Sr 2 GeS 4 structure prepared by the Bridgman method were investigated through DTA and dielectric measurements. Ferroelectric activity was found below 270 K, where the b -direction dielectric constant showed a sharp peak. The spontaneous polarization measured by the pyroelectric charge method was 0.32 µ C/cm 2 at 100 K. The dielectric constant also showed a small stepwise anomaly around 190 K.
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Shimizu et al. (1994) studied this question.
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