Pressure effects on the magnetocaloric properties of Ni-rich and Mn-rich Ni2MnGa alloys

被引：40
作者：
Albertini, F.
Kamarad, J.
Arnold, Z.
Pareti, L.
Villa, E.
Righi, L.
机构：
[1] CNR, IMEM, I-43010 Parma, Italy
[2] Acad Sci Czech Republ, Inst Phys, Prague 18221 8, Czech Republic
[3] CNR, TEMPE, I-23900 Lecce, Italy
[4] Dipartimento Chim GIAF, I-43100 Parma, Italy
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2007年 / 316卷 / 02期
关键词：
magnetocaloric effect; magnetoelastic property; pressure effect; Heusler alloy;
D O I：
10.1016/j.jmmm.2007.03.020
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：364 / 367
页数：4
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