, Volume 17, Issue 1, pp 37-53

Specific heat of Nickel-Iron and Nickel-Cobalt alloys between 600° K and 1500° K

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Abstract

The λ-specific heat anomalies of ferromagnetic fcc Ni−Co and Ni−Fe alloys were investigated near the Curie temperatures. The magnetic contribution to the specific heat was found to be logarithmically divergent [c M=log|T/T c−1| A ] above the Curie temperature. The exponentA was composition dependent. Entropy and energy values associated with magnetic transions were determined experimentally and compared with theoretical predictions of the Heisenberg and Ising localized electron models obtained from series expansion calculations.