Tuning magnetostructural transition and the associated giant magnetocaloric effect via thermal treatment in MnCoGe-based alloys

Tuning magnetostructural transition and the associated giant magnetocaloric effect via thermal treatment in MnCoGe-based alloys
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通过热处理调节 MnCoGe 基合金的磁结构转变和相关的巨磁热效应

DOI:
10.1016/j.jmmm.2018.09.016
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发表时间:
2019
影响因子:
2.7
通讯作者:
D.H. Wang
D.H. Wang
中科院分区:
材料科学3区
文献类型:
--
作者:
C.L. Zhang;Y.G. Nie;H.F. Shi;E.J. Ye;Z.D. Han;D.H. Wang

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通过控制Mn 1 − xCo 1 +xGe合金的退火和冷却过程,研究了不同应力状态下Mn 1 − xCo 1 +xGe合金的磁结构转变行为和磁热效应的变化。水淬火抑制在调查的组合物和温度范围内的结构转变,而炉冷却耦合磁结构转变的结果。在中间温度下进行额外的退火,然后进行程序控制的缓慢冷却,导致更尖锐的转变、更高的转变温度、更低的热滞后、更高的场灵敏度和更高的熵变。不同热处理的样品在不同的温度区观察到巨磁热效应。
The changes in magnetostructural transition behaviors and magnetocaloric effect with different stress states were studied by controlling the annealing and cooling processes for Mn1−xCo1+xGe alloys. Water quenching inhibits the structural transition in the investigated composition and temperature ranges, while furnace cooling results in coupled magnetostructural transitions. An additional annealing at an intermediate temperature followed by program-controlled slow cooling results in sharper transition, higher transition temperature, lower thermal hysteresis, higher field-sensitivity, and higher entropy change. Giant magnetocaloric effects were observed at different temperature regions for the samples subjected to different thermal treatments.
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