Abstract
Using the Néel model for a two-sublattice material, the magnetic contribution C m to the specific heat in the vicinity of the Curie temperature is calculated in the molecular field approximation. At the Curie temperature the calculation reveals a discontinuity ΔC m in the specific heat, which is evaluated and compared with experiment. The theoretical and experimental values are in good agreement for Zn0.38Mn0.62Fe2O4 and Zn0.5Ni0.5Fe2O4 as measured by Verhaeghe et al, and for MnFe2O4, measured in the present work. The agreement is less satisfactory in the case of Zn0.5Mg0.5Fe2O4 as measured by Shulga (1957).
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Nielsen, O.V. Specific heat anomaly of ferrites at the curie temperature. Appl. Sci. Res. 20, 381–389 (1969). https://doi.org/10.1007/BF00382409
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DOI: https://doi.org/10.1007/BF00382409