Thermophysical properties of the intermetallic Mn3MN perovskites III. Heat capacity of the solid solution Mn3.2Ga0.8N |
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Authors: | Joaquín García Juan Bartolomé Domingo González Rafael Navarro Daniel Fruchart |
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Institution: | Departamento de Termología, Facultad de Ciencias, Universidad de Zaragoza, Spain;Departamento de Física, E.T.S.I.I., Universidad de Zaragoza, Spain;Laboratoire de Cristallographie, 166X, 38042, Grenoble-Cedex, France |
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Abstract: | The heat capacity of the solid solution Mn3.2Ga0.8N was measured between 5 to 330 K by adiabatic calorimetry. A sharp anomaly with first-order character was detected at TA = (160.5±0.5) K, corresponding to a magnetic rearrangement and a lattice expansion. No sharp anomaly was observed at Tc ≈ 260 K where the magnetic ordering takes place; instead, a smooth shoulder was detected. The thermodynamic functions at 298.15 K are , , , . At low temperatures the coefficient for the linear electronic contribution to the heat capacity was derived: γ = (0.031±0.003) J·K?2·mol?1. Moreover, the different contributions to the heat capacity were obtained and the electronic origin of the phase transitions was established. |
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