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Heat capacity and entropy of MnF2 from 10 to 300 °K. Evaluation of the contributions associated with magnetic ordering

1976; American Institute of Physics; Volume: 65; Issue: 10 Linguagem: Inglês

10.1063/1.432885

1520-9032

W. O. J. Boo, J. W. Stout,

Theoretical and Computational Physics

The heat capacity of a sample of MnF2 consisting of crystals larger than 2 mm has been measured between 10 and 300 °K. The peak in heat capacity associated with the antiferromagnetic ordering is at 67.30 °K. Measurements with small temperature rise show the shape of the heat capacity curve near the anomaly. The corresponding states approximation for evaluating the lattice heat capacity is tested in regions where the magnetic contributions are calculable. Magnetic contributions to the heat capacity and entropy are tabulated between 10 and 100 °K. Smooth values of the total heat capacity, entropy, enthalpy, and Gibbs energy are tabulated between 10 and 300 °K. Values at 298.15 °K are C°P=15.96 cal °K−1 mole−1, S°=22.04 cal °K−1 mole−1, H°−H°0=3106 cal mole−11.