【作者】 于东华； 敬超； 李哲； 张浩雷； 曹世勋； 张金仓；

【Author】 YU Dong-hua,JING Chao,LI Zhe,ZHANG Hao-lei,CAO Shi-xun,ZHANG Jin-cang (College of Physics,Shanghai University,Shanghai 200444,China)

【机构】 上海大学物理系；

【摘要】 通过磁性测量手段,研究了哈斯勒合金Ni₄₅Co₅Mn₃₇In₁₃的马氏体相变和磁热效应。结果表明,样品的一级结构马氏体相变,是从纯铁磁态转变成纯反铁磁态,从而导致母相与马氏体相之间的磁化强度具有很大的差异。在此基础上,通过Maxwell方程评估了该合金样品在反马氏体相变过程中的磁热效应,发现当磁场改变4776kA/m时,其最大磁熵变为约30J/kg,且该熵变值能够保持在一个接近15K的温度跨度内,充分显示了该合金作为磁制冷材料的潜在能力。更多还原

【Abstract】 The martensitic transition and magnetocaloric effect in Ni₄₅Co₅Mn₃₇In₁₃Heusler alloy has been investigated by magnetic measurements.It is observed that the sample undergoes martensitic transition from pure ferromagnetic state to antiferromagnetic state,resulting in a large difference in magnetization between parent and martensitic phases.On this basis,the magnetocaloric effect during reverse martensitic transition is evaluated through Maxwell relation.It is found that the sample show the maximum magnetic entropy with the value of about 30J/（kg·K） in the temperature span of 15K,exhibiting a potential ability as magnetic refrigerator materials.更多还原