Si和Ga取代对NiCoMnSb四元Heusler合金磁热性能的影响
Effect of Si and Ga substitutions on the magnetocaloric properties of NiCoMnSb quaternary Heusler alloys
摘要：
本文研究了Si和Ga替代对Heusler基Ni_（46）Co_（44）Mn_（38）Sb_（12-x）Z_x（Z=Si和Ga）系统磁性能和磁热性能的影响。从M（T）图中发现，Si取代稳定奥氏体相，而Ga取代稳定马氏体相。当Si=0.75和1时，在M（H）等温线上观察到强变磁行为，而Ga取代的合金中没有这种行为。与磁结构转变，大MCE的58 J/kg K和70 J/kg K的观察x=0.75和1，分别在Si的情况下。虽然在Ga的情况下在x=0.5和1中观察到的MCE低得多，但发现MCE峰相当宽。
英文摘要：
The effect of Si and Ga substitutions on the magnetic and the magnetocaloric properties in Heusler based system Ni46Co4Mn38Sb12-xZx (Z=Si and Ga) has been studied. From the M(T) plots it is found that Si substitution stabilizes the austenite phase, whereas, Ga substitution stabilizes the martensite phase. Strong metamagnetic behaviour is observed in the M(H) isotherms for Si=0.75 and 1, whereas, such a behaviour is absent in the Ga substituted alloys. Associated with magneto-structural transition, large MCE of 58 J/kg K and 70 J/kg K is observed for x=0.75 and 1, respectively in the case of Si. Though the MCE observed in x=0.5 and 1 in the case of Ga is much lower, the MCE peak is found to be quite broad.
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