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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Magnetic and magnetocaloric properties of Mn_5Ge_(3-x)Sb_x
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Magnetic and magnetocaloric properties of Mn_5Ge_(3-x)Sb_x

机译：Mn_5Ge_（3-x）Sb_x的磁和磁热性质

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摘要

We have studied the magnetic properties of Mn_5Ge_(3-x)Sb_x compounds with x=0, 0.1, 0.2 and 0.3 by means of magnetisation measurements at different temperatures and fields up to 5 T. The compounds crystallize in the hexagonal Mn_5Si_3-type structure with space group P6_3/mcm. The compounds show enhanced Curie temperatures but decreasing average magnetic Mn moments with increasing Sb content. The magnetic entropy changes in these compounds are determined from the temperature and field dependence of the magnetisation using the thermodynamic Maxwell relation. Mn_5Ge_3 exhibits considerably large magnetic entropy changes that are comparable with that of Gd metal. The Sb substitution has two kinds of effects on the magnetocaloric effect (MCE) of Mn_5Ge_(3-x)Sb_x. one is the magnetic entropy change that decreases with increasing Sb content, the other is the MCE peak that becomes broadened.
机译：我们通过在不同温度和磁场下进行磁化测量，研究了x = 0、0.1、0.2和0.3时Mn_5Ge_（3-x）Sb_x化合物的磁性能。这些化合物在六方晶Mn_5Si_3-型结构中结晶空间组为P6_3 / mcm。这些化合物显示出更高的居里温度，但是随着Sb含量的增加，平均Mn磁矩减小。使用热力学麦克斯韦关系从磁化的温度和场依赖性确定这些化合物的磁熵变。 Mn_5Ge_3表现出与Gd金属相当的较大的磁熵变。 Sb取代对Mn_5Ge_（3-x）Sb_x的磁热效应（MCE）有两种影响。一个是随着Sb含量的增加而减小的磁熵变，另一个是MCE峰变宽。

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