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Abstract
Results of calorimetric, dilatometric, dielectric and magnetic investigations of TEA 2 MnCl 4 crystals in a wide temperature range are presented. Two anomalies typical for the first-order phase transition at T 1 = 224 K and T 2 = 228 K were observed. The entropy jumps of 17 J/mol and 11 J/mol were determined at T 1 and T 2 , respectively. The coefficients dT i /dp) are positive and equal to dT1/dp ≅ 0.52 K/MPa and dT 2 /dp ≅ .30 K/MPa. The triple point existence under about p trip = 100 MPa at T trip = 255 K can be expected. The TEA 2 MnCl 4 crystals exhibit paramagnetic properties in the temperature range from 4.2 to 300 K. The Curie-Weiss law is fulfilled and any anomalies of magnetic properties were not observed near the phase transitions temperature.