Abstract
Occurrence of the Invar anomaly in thermal expansion characteristics of antiferromagnetic Fe–Mn–(Ni) alloys having constant Mn/Fe atomic ratios of ⅔ has been investigated. Linear spontaneous magnetostriction, Néel temperature, and inflection temperature were found to be well described by electron concentration; Ni substitution decreased all of these parameters. Such results are shown to be consistent with Zener's Invar theory based on competing exchange interactions.
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