Magnetocaloric effect in high Ni content Ni52Mn48−xInx alloys under low field change
Magnetocaloric effect in high Ni content Ni52Mn48−xInx alloys under low field change
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DOI：
10.1016/j.jmmm.2011.08.031
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发表时间：
2012-02
影响因子：
2.7
通讯作者：
F. S. Liu;Q. Wang;W. Ao;Yinde Yu;L. Pan;Jun-qing Li
中科院分区：
文献类型：
--
作者：
F. S. Liu;Q. Wang;W. Ao;Yinde Yu;L. Pan;Jun-qing Li
采用电弧熔炼法制备了富镍Heusler合金Ni{sub 52}Mn{sub 48-x}In{sub x} （x=15.5、16和16.5）。x射线衍射分析表明，该马氏体在室温下具有正交结构（S.G. Pmm2）。唯一的x=15.5合金有从马氏体到奥氏体的组织传递，没有任何磁传递。磁化强度测量的温度依赖性和场依赖性表明，磁化强度随Mn浓度的降低而增大。in原子位置的Mn原子越少，体系中AFM相互作用的总量越弱。Ni{sub 52}Mn{sub 48-x} in {sub x}合金中发现了巨大的熵变{Delta}S{sub M}(T， H)，在270 K时，在1.5 T的磁场变化下，当x=16.5时，样品的{Delta}S{sub M}值最大值为22.3 J kg K。>室温马氏体结构-磁相变。In原子位置Mn含量低，磁化强度高，马氏体与奥氏体差异大。>在1.5 T的低磁场变化下，具有较大的磁热效应。
Ni-rich Heusler alloys Ni{sub 52}Mn{sub 48-x}In{sub x} (x=15.5, 16 and 16.5) were prepared by the arc melting method. X-ray diffraction analysis revealed that the martensite has orthorhombic structure (S.G. Pmm2) at room temperature. The only alloy with x=15.5 has structural transmission from martensite to austenite without any magnetic transmission. The temperature dependence and the field dependence of the magnetization measurement indicated that the magnetization increased with the decreasing of the concerntration of Mn. The lesser the Mn atoms located in the In atom sites, the weaker the total AFM interaction in the system. Giant entropy changes {Delta}S{sub M}(T, H) were found in Ni{sub 52}Mn{sub 48-x}In{sub x} alloys with the maximum {Delta}S{sub M} value of 22.3 J kg K for the sample with x=16.5 at 270 K under the magnetic field change of 1.5 T. - Highlights: > Hight Ni content Heusler alloy Ni{sub 52}Mn{sub 48-x}In{sub x} (x=15.5, 16.0 and 16). > Marstensitic structural-magnetic transformation at room temperature. > Lesser Mn at In atomic site, higher magnetization and difference between marstensite and austenite. > Large magnetocaloric effect under low magnetic field change of 1.5 T.