Structure and magnetic properties of Mn1.2Fe0.8P0.76Ge0.24 annealed alloy
Structure and magnetic properties of Mn1.2Fe0.8P0.76Ge0.24 annealed alloy
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DOI：
10.1007/s12598-012-0516-5
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发表时间：
2012-08
期刊：
影响因子：
8.8
通讯作者：
Hang Xu;M. Yue;Chuanjia Zhao;Dongtao Zhang;Jiuxing Zhang
中科院分区：
文献类型：
--
作者：
Hang Xu;M. Yue;Chuanjia Zhao;Dongtao Zhang;Jiuxing Zhang
Bulk Mn1.2Fe0.8P0.76Ge0.24alloy was prepared by mechanical milling and subsequent spark plasma sintering technique. Effect of annealing on the structure and magneto-caloric properties of the alloy was investigated. XRD results show that both sintered and annealed samples possess a hexagonal Fe2P-type crystal structure. After annealing, ferromagnetic impurity Fe3Mn4Ge6, which exists in the sintered sample, was eliminated from the alloy. Furthermore, the lattice constantsaandcchange noticeably, leading to a decrease inc/aratio, while the cell volume almost remains invariable. As a result, the Curie temperature of the alloy increases from 253 K to 298 K, but the maximum magnetic entropy change decreases from 37.5 to 11.7 J·kg·K−1for 2 T magnetic field change. On the other hand, the thermal hysteresis ofM-Tcurves aroundTCupon heating and cooling is 14 and 8 K for the as-sintered and the annealed sample, respectively, showing evident change.
