Abstract
Mn2NiGa1-xCrx (x = 0–0.5) alloys were synthesized successfully to explore possible Cr-based all-d-metal Heusler alloys with magnetic shape memory effects. When x = 0–0.25, Mn2NiGa1-xCrx are single BCC Heusler phase, but when x = 0.375 some FCC phase co-exists with the main Heusler phase, finally a pure FCC phase is formed in Mn2NiGa0.5Cr0.5. In BCC Mn2NiGa1-xCrx, Cr-doping leads to the decrease of martensitic transformation temperature TM and increase of the saturation magnetization Ms at 5 K. While the FCC phase does not show the trace of phase transition and has a very low magnetization till 5 K. First-principles calculations suggest that, in BCC Mn2NiGa1-xCrx the partial spin moment of Cr is large and parallel to that of Mn (B), which leads to the increase of Ms when x = 0–0.25. A higher stability of the martensite than the austenite is found, which supports the phase transition observed experimentally. It may be noticed that the TM of Mn2NiGa1-xCrx decreases with both increasing e/a and decreasing cell volume, which is opposite to the empirical rule in traditional Heusler alloys. Calculation suggests that Cr–Ga disorder may be a possible reason for this decrease.
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