磁制冷
凝聚态物理
材料科学
三元运算
合金
磁性形状记忆合金
相变
马氏体
磁化
热力学
制冷剂
磁场
磁滞
冶金
物理
磁畴
微观结构
计算机科学
程序设计语言
气体压缩机
量子力学
作者
Jeffrey Brock,Abdul Quader,Ramakanta Chapai,Mahmud Khan
标识
DOI:10.1016/j.ssc.2024.115516
摘要
We have investigated the magnetostructural phase transitions and the associated entropy changes in a system of three Heusler alloys, namely: Ni2Mn0.55Cr0.45Ga, Ni2Mn0.55Co0.10Cr0.35Ga, and Ni2.15Mn0.75Cr0.1Ga. All three alloys exhibited first-order martensitic phase transition. An inter-martensitic phase transition raised the magnetic and structural phase transition temperatures, and partially decoupled the said transitions. Furthermore, field magnetization measurements demonstrated that a significant reduction in magnetic hysteresis is achieved in the Ni2Mn0.55Co0.10Cr0.35Ga compound, resulting in improved effective refrigerant capacity values. The largest magnetic entropy change of −23.5 J/kg K and refrigeration capacity of 97.7 J/kg were observed in Ni2.15Mn0.75Cr0.1Ga. This observation of mitigated deficiencies in materials experiencing a first-order phase transition is relevant towards their application in magnetic refrigeration.
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