Magnetic entropy change in melt-spun MnFePGe (invited)
Magnetic entropy change in melt-spun MnFePGe (invited)
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DOI：
10.1063/1.2162807
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发表时间：
2006-04
影响因子：
3.2
通讯作者：
A. Yan;K. Müller;L. Schultz;O. Gutfleisch
中科院分区：
文献类型：
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作者：
A. Yan;K. Müller;L. Schultz;O. Gutfleisch
在 Mn1.1Fe0.9P1−xGex (x=0.2, 0.24) 熔纺带材中观察到巨磁热效应。 Mn1.1Fe0.9P0.76Ge0.24 的最大磁熵变∣ΔSM∣在 317 K 左右从 0 到 5 T 的场变化中达到 35.4J∕kgK。该值优于报道的机械合金化合成的 Mn1.1Fe0.9P0.76Ge0.24 的值（306 K 时~30J∕kgK）。大的磁热效应是由于与熔体纺丝过程中非常高的冷却速率相关的更均匀的元素分布造成的。优异的磁热效应特性、较低的材料成本和加速老化机制使熔纺型 MnFePGe 材料成为磁性制冷剂应用的绝佳候选者。
Giant magnetocaloric effect was observed in Mn1.1Fe0.9P1−xGex (x=0.2, 0.24) melt-spun ribbons. The maximum magnetic entropy change ∣ΔSM∣ of Mn1.1Fe0.9P0.76Ge0.24 reaches 35.4J∕kgK in a field change from 0 to 5 T at around 317 K. This value is superior to that reported for Mn1.1Fe0.9P0.76Ge0.24 synthesized by mechanical alloying (∼30J∕kgK at 306 K). The large magnetocaloric effect results from a more homogenous element distribution related to the very high cooling rate during melt spinning. The excellent magnetocaloric effect properties, the low material cost, and the accelerated aging regime make the melt-spun-type MnFePGe materials an excellent candidate for magnetic refrigerant applications.