Several A 4 [M(CN) 6 ]·3H 2 O type cyano-complexes belonging to the crystal class C 2 h were studied to examine ferroelectricity. Isomorphous substances obtained through replacing the Fe ++ ion by Ru ++ , Os ++ and Mn ++ ions show ferroelectric behavior below -14°C, -2.4°C and -40°C respectively. Ferroelectric behavior of these compounds are vary similar to that of the potassium ferrocyanide trihydrate, reported before. The potassium ferrocyanide group ferroelectrics has ferroelectric axis parallel to [101] direction. Ferroelectric transition of these substances is probably of the second order.
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Waku et al. (1960) studied this question.