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Giant magnetocaloric effect in Gd5(Si2Ge2) alloy with low purity Gd

机译:低纯度Gd的Gd5(Si2Ge2)合金中的巨大磁热效应

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Gd5(Ge1-xSi x), x < 4 based alloys are potential candidates for magnetic refrigeration in the range ~20 - ~290 K. However, one of the greatest obstacles for the use of that technology in large scale is the utilization of high pure Gd metal (99.99 wt. (%)) to produce the GdGeSi alloys, since the impurity elements decrease the intensity of the magnetocaloric effect (EMC)1. In this work, we prove that annealing of the Gd5Ge2Si2 can promote remarkable values for the EMC in comparison to those obtained for the alloy with high pure Gd. Also, the as cast alloy and the annealed alloy are not monophasic, but have at least two crystalline phases in their microstructure. Results for X-ray analysis, optical and electronic microscopy and magnetization measurements are reported.
机译:Gd5(Ge1-xSi x),x <4基合金是〜20-〜290 K范围内磁制冷的潜在候选者。但是,大规模使用该技术的最大障碍之一是高利用率。由于杂质元素降低了磁热效应(EMC)1的强度,因此可以使用纯Gd金属(99.99 wt。(%))生产GdGeSi合金。在这项工作中,我们证明了与高纯Gd合金相比,Gd5Ge2Si2的退火可以提高EMC值。同样,铸态合金和退火合金不是单相的,而是在其微观结构中具有至少两个结晶相。报告了X射线分析,光学和电子显微镜以及磁化强度测量的结果。

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