Abstract
anomaly of thermal deformation typical of first order phase transition at 258 K and additional continuous anomaly at 195 K were observed. It was shown that low temperature anomalies of physical properties of [N(C2H5)4]2CuCl4 crystals can be described as overcritical trace of isomorphous phase transitions. Results of numerical analysis of phenomenological model of improper ferroelastic exhibiting isomorphous phase transitions are presented and compared with experimentally determined temperature dependencies of spontaneous deformation of [N(C2H5)4]2CuCl4 crystals. PACS numbers: 61.68.+n
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