Abstract
The thermodynamic properties of Fe-Ni Invar alloys are analyzed in terms of the theoretical results obtained in the itinerant electron model accompanying in the mixing of the ferromagnetic and paramagnetic phases with different atomic volumes. All the anomalies in Fe-Ni Invar alloys are explained by the effect of a large magnetovolume coupling and this large coupling is attributed to the magnetic transformation due to the changes in temperature, magnetic field and pressure. There is also an enhancement due to the magnetovoume coupling to the high-field susceptibility, compressibility and forced magnetostriction. The pressure dependence of T c is also discussed.
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