The pronounced magnetocaloric properties of Ni2 +/- xMn1 +/- yGa1 +/- z alloys are strongly dependent on both the composition and the inter-atomic distances. Moreover, the off-stoichiometric Mn- and Ni-rich Ni2MnGa compounds exhibit mutually different magnetocaloric behaviour under high hydrostatic pressure. A pressure-induced co-occurrence of martensitic transformation and magnetic transition was found for Mn-rich compounds, resulting in a substantial increase of magnetocaloric effect. In contrast to this, the magnetocaloric effect was partially suppressed in the Ni-rich compounds under high pressure. These results reflect the specific role of Ni in the martensitic transformation of Ni2MnGa alloys.
Pressure effects on the magnetocaloric properties of Ni-rich and Mn-rich Ni2MnGa alloys / F., Albertini; J., Kamarad; Z., Arnold; L., Pareti; E., Villa; Righi, Lara. - In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - ISSN 0304-8853. - 316:2(2007), pp. 364-367. [10.1016/j.jmmm.2007.03.020]
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