为研究铟替代部分锗对锰钴锗合金磁结构相变与磁热效应的影响,采用电弧熔炼方法制备了Mn1 Co1 Ge1和Mn1 Co1 Ge0．99 In0．01合金,研究了这两种合金的物相、相变和磁热效应,以及升、降温测试方式得到的Mn1 Co1 Ge0．99 In0．01合金的磁化曲线.结果表明：铟替代部分锗后,合金中并未产生杂相,其相变特性由二级磁相变变为一级磁结构相变；Mn1 Co1 Ge0．99 In0．01合金在不同的相变方向上具有不同的磁滞后行为；升温测试时,Mn1 Co1 Ge0．99 In0．01合金在5,7 T磁场强度下的磁熵变峰值分别为52．2,64．1 J.kg－1.K－1,降温测试时的磁熵变峰值分别为40．8,50．9 J.kg－1.K－1；升温测试时,Mn1 Co1 Ge0．99 In0．01合金在7 T磁场强度下的制冷能力为477 J.kg－1,降温测试时为264．4 J.kg－1.
In order to investigate the effects of In-substitution for partial Ge on magneto-structural transition and magnetocaloric effect (MCE),Mn1 Co1 Ge1 and Mn1 Co1 Ge0.99 In0.01 alloys were prepared by arc-melting method, and phase composition,phase transition,MCE and magnetization isotherms of Mn1 Co1 Ge0.99 In0.01 alloy obtained by warming and cooling modes were studied.The results show that In-substitution for partial Ge would not lead to impurity phase,but could turn the second-order magnetic transition to first-order magneto-structural transition. Mn1 Co1 Ge0.99 In0.01 alloy owned different magnetism hysteresis behaviors on different phase transformation directions.In warning mode,the maximal magnetization entropy of Mn1 Co1 Ge0.99 In0.01 alloy at magnetic intensigy of 5,7 T were 52.2,64.1 J.kg-1.K-1 ,respectively;in cooling mode,those were 40.8,50.9 J.kg-1.K-1 ,respectively. The refrigeration capacity of Mn1 Co1 Ge0.99 In0.01 alloy at magnetic intensity of 7 T was 477 J.kg-1 in warning mode, and that was 264.4 J.kg-1 in cooling mode.
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