Low-field magnetocaloric effect in antiperovskite Mn3Ga1-xGexC compounds

Low-field magnetocaloric effect in antiperovskite Mn3Ga1-xGexC compounds
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反钙钛矿 Mn3Ga1-xGexC 化合物的低场磁热效应

DOI:
10.1016/j.jmmm.2015.08.034
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发表时间:
2015-12
影响因子:
2.7
通讯作者:
Jiang Xuefan
Jiang Xuefan
中科院分区:
材料科学3区
文献类型:
--
作者:
Shao Qiang;Lv Qun;Yang Xiaozhi;Han Zhida;Dong Shiyuan;Qian Bin;Zhang Lei;Zhang Changliang;Fang Yong;Jiang Xuefan

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通过固相反应制备了一系列Mn 3 Ga 1− x Ge x C (x= 0, 0.1, 0.2) 化合物,并研究了它们的磁性能、相变和磁热效应。所有样品在低于居里温度 T c 变为铁磁性后,在低温 T t 处经历一级铁磁-反铁磁转变,产生常规和逆磁热效应。随着Ge含量的增加,T t 增加,而T c 减少。 T t 周围的等温磁化曲线强烈依赖于历史,这可能会导致磁场引起的熵变 (Δ S M) 出现虚假峰值。 T t 附近的磁热特性与T c 附近相比,ΔS M 较大,但磁滞较大,制冷量较小。
A series of Mn 3 Ga 1− x Ge x C (x= 0, 0.1, 0.2) compounds were prepared by solid state reaction, and their magnetic properties, phase transitions, and magnetocaloric effect were investigated. All samples, after becoming ferromagnetic below Curie temperature T c, undergo a first-order ferromagnetic–antiferromagnetic transition at T t at low temperature, giving rise to conventional and inverse magnetocaloric effect. T t increases while T c shows a decrease with the increase of Ge content. Isothermal magnetization curves around T t are strongly history-dependent, which may result in spurious peak in the magnetic field induced entropy change (Δ S M). The magnetothermal properties near T t, compared with those near T c, are of larger Δ S M, but have larger magnetic hysteresis and smaller refrigerant capacity.
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期刊: The Journal of Cell Biology
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