Structural, thermal, and magnetic properties of MnFePSiGe compounds prepared by spark plasma sintering method
Structural, thermal, and magnetic properties of MnFePSiGe compounds prepared by spark plasma sintering method
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DOI：
10.1016/j.jmmm.2013.01.035
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发表时间：
2013-06
影响因子：
2.7
通讯作者：
M. Yue;Hang Xu;J. Zhao;M. F. Xu;Dong Liu;J. Zhang
中科院分区：
文献类型：
--
作者：
M. Yue;Hang Xu;J. Zhao;M. F. Xu;Dong Liu;J. Zhang
研究了放电等离子烧结法制备的不同硅含量的MnFePSiGe块体化合物的晶体结构、热性能和磁性能。MnFePSiGe化合物为六方Fe_2 P型结构，没有明显的第二相。这些化合物在居里温度（TC）附近发生铁磁到顺磁的一级相变。随着Si含量的增加，化合物的TC和磁熵变（-ΔSM）显著增加，而热滞（Thys）几乎不变.对于MnFeP_（0.63）Si_（0.26）Ge_（0.11）化合物，在0 ~ 2 T的磁场变化下，其相变温度TC和-Δ SM分别为318 K和27.9J/KgK，由DSC测得其相变熵变ΔS为32.3J/KgK。
Crystal structure, and thermal and magnetic properties have been studied for bulk MnFePSiGe compounds with different silicon contents prepared by the spark plasma sintering method. The MnFePSiGe compounds crystallize in a hexagonal Fe2P-type structure without obvious secondary phase. The compounds undergo a ferromagnetic to paramagnetic first-order transition near their Curie temperature (TC). With increase of Si content, both TCand magnetic entropy change (−ΔSM) of the compounds rise remarkably, while the thermal hysteresis (Thys) remains almost invariant. For MnFeP0.63Si0.26Ge0.11compound, the TCand −ΔSMfor a magnetic field change from 0 to 2T are 318K and 27.9J/KgK, respectively, and its phase transition entropy change (ΔS) obtained from DSC is 32.3J/KgK.