Magnetostructural transformation, microstructure, and magnetocaloric effect in Ni-Mn-Ga Heusler alloys
Magnetostructural transformation, microstructure, and magnetocaloric effect in Ni-Mn-Ga Heusler alloys
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DOI：
10.1063/1.2751489
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发表时间：
2007-07
影响因子：
3.2
通讯作者：
B. Ingale;R. Gopalan;M. M. Raja-M.;V. Chandrasekaran;S. Ram
中科院分区：
文献类型：
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作者：
B. Ingale;R. Gopalan;M. M. Raja-M.;V. Chandrasekaran;S. Ram
研究了富镍铁磁Heusler合金的磁结构转变及相关的磁熵变化。在Ni54.8Mn20.3Ga24.9和Ni55Mn18.9Ga26.1两种合金成分中，观察到由铁磁马氏体相直接转变为顺磁奥氏体相。Ni54.8Mn20.3Ga24.9合金在几乎相同的温度（351 K）下发生了磁相变和马氏体相变。这种典型的组合物在施加1.2 T的磁场中，在332 K时，磁熵ΔSM的变化高达−7.0 J/kg K。
Magnetostructural transformation and the associated magnetic entropy change were investigated in Ni-rich ferromagnetic Heusler alloys. A direct transformation from the ferromagnetic martensite phase to the paramagnetic austenite phase was observed in selected Ni54.8Mn20.3Ga24.9 and Ni55Mn18.9Ga26.1 two-alloy compositions. The magnetic and martensitic transformations were incurred at nearly the same temperature (351 K) in the Ni54.8Mn20.3Ga24.9 alloy. Such a typical composition involves a change of the magnetic entropy ΔSM as large as −7.0 J/kg K at 332 K in an applied magnetic field of 1.2 T.