Abstract

A quasi-chemical theory of thermodynamics, based on a strictly-regular solution model, has been proposed for ferromagnetic binary alloys containing a non-magnetic solute. The free energies and the enthalpies of mixing as well as the effects of alloying on the Curie temperature and the spontaneous magnetization have been described in terms of the atomic interaction energy and the Heisenberg exchange integral. The theory has been shown to account fairly well for measured thermodynamic and ferromagnetic behaviors.

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