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Calorimetric investigations of overcritical behaviour in (TEA)2CuCl4 crystals

Abstract The results of experimental investigation of molar heat capacity of [N(C2H5)4]2CuCl4 - ferroelasto-ferroelectric crystals in a wide temperature range are presented. The typical anomaly for the first order phase transition of order-disorder type at 258 K and additional anomaly with maximum at 195 K has been observed. We suggest that the low temperature anomalies of physical properties of [N(C2H5)4]2CuCl4 crystals can be attributed to over critical traces of isomorphous phase transitions (similar to that observed in liquid-gas system). Results of numerical analysis of phenomenological model of phase transition in [N(C2H5)4]2CuCl4 crystals are presented and compared with the experimentally determined temperature dependence of the specific heat and entropy changes.