Mn-rich (∼50 at. %) Fe-doped Mn2NiSn off-stoichiometric Heusler alloys were prepared and studied by varying the Ni/Fe and Mn/Fe ratios. The martensitic transition temperature was found to decrease when Ni was replaced by Fe, but an opposite result was observed in the case of replacement of Mn by the same element. Substitution of Fe significantly affected the ferro/antiferro interactions in both the austenite and martensite phases of these alloy series. Large magnetic entropy changes with high refrigerant capacities were observed in the alloys with a small percentage of Fe doping which can be effective for efficient magnetic cooling.
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Ghosh et al. (2015) studied this question.
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