Abstract
The crystal structures, magnetic structures, and phase transformation of the off-stoichiometric Ni53Mn25Ga22 were studied by neutron powder diffraction at different temperatures. It is shown that Ni53Mn25Ga22 has a tetragonal I4/mmm structure from 20Kto403K. An abrupt jump in unit-cell volume around room temperature, corresponding to an endothermic peak in the differential scanning calorimetry curve, was observed. This indicates a pretransformation in the martensitic phase of Ni53Mn25Ga22, which is completely different from the phase transformation in the stoichiometric Ni2MnGa. The sequence of structural transformation in Ni53Mn25Ga22 is closely related to its intrinsic temperature-dependent magnetic structure.
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