On taking into account the irreversibility of first-order phase transitions
Magomedov M. N. 1
1Institute for geothermal problems and renewable energy – branch of the joint Institute of high temperatures of the Russian Academy of Sciences, Makhachkala, Russia
Email: mahmag4@mail.ru

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Based on the fact of irreversibility of the real first-order phase transition (PT-1), an inequality was obtained that generalizes the Clapeyron-Clausius equation (CCE) in the case of irreversibility of PT-1: the Clapeyron-Clausius inequality. It was shown that the CCE determines only the maximum possible slope of the line PT-1 in the coordinates temperature-pressure and temperature-intensity of an external homogeneous magnetic (or electric) field. Analysis of experimental data for various types of PT-1 has shown that the deviation from the CCE is more noticeable the more jump in volume or jump in magnetization (or polarization) at PT-1. Keywords: first-order phase transition, Clapeyron-Clausius equation, irreversibility, magnetic field.
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