Abstract
A phenomenological model of a sequence of phase transitions in [N(C2H5)4]2CuCl4 crystals has been proposed. The model is constructed by methods of singularities of differentiable maps (the catastrophe theory). In this model, low-temperatures anomalies of thermal properties (entropy and heat capacity) are interpreted as isomorphic phase transitions or as a supercritical behavior on a thermodynamic path in the phase diagram near liquid-vapor end points.
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