Enhanced magnetocaloric effect in Heusler Ni–Mn–Sn unidirectional crystal
Enhanced magnetocaloric effect in Heusler Ni–Mn–Sn unidirectional crystal
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DOI：
10.1016/j.jallcom.2015.02.090
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发表时间：
2015-06
影响因子：
6.2
通讯作者：
Jian Ren;Hongwei Li;Jinke Yu;Shutong Feng;Q. Zhai;Jianxun Fu;Zhiping Luo;Hongxing Zheng
中科院分区：
文献类型：
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作者：
Jian Ren;Hongwei Li;Jinke Yu;Shutong Feng;Q. Zhai;Jianxun Fu;Zhiping Luo;Hongxing Zheng
在本工作中，使用改进的高压光学区域熔化炉制备了具有 L21(2 2 0) 择优取向的 Heusler Ni-Mn-Sn 合金的单向晶体。当施加平行于晶体生长方向的磁场时，马氏体相变和奥氏体磁转变附近的磁熵变最大值分别为5.58 J/kg K和-2.87 J/kg K。在30 kOe的磁场变化下，总有效制冷量达到127 J/kg。当磁场施加方向垂直于生长方向时，磁性能几乎保持恒定。这种磁热效应归因于沿两个方向相对较低的磁各向异性，这有利于制冷的实际应用。
A unidirectional crystal of Heusler Ni–Mn–Sn alloy withL21(2 2 0) preferential orientation was fabricated using a modified high-pressure optical zone-melting furnace in the present work. When a magnetic field was applied parallel to the crystal growth direction, the maximum values of magnetic entropy change in the vicinity of the martensitic transformation and the magnetic transition of austenite were found to be 5.58 J/kg K and −2.87 J/kg K, respectively. The total effective refrigeration capacity reached 127 J/kg under a magnetic field change of 30 kOe. The magnetic properties almost remained constant when the magnetic field was applied a direction perpendicular to the growth direction. Such magnetocaloric effect was ascribed to the relatively lower magnetic anisotropy along both directions, which is advantageous for practical utilization of refrigeration.