Mn原材料纯度对Mn1.2Fe0.8P0.74Ge0.26化合物磁热性能的影响研究
首发时间:2016-05-19
摘要:MnFePGe系列化合物具有优异的磁热性能,而且主要原材料广泛易得,是有望大规模生产的室温磁制冷材料。但由于高纯度原材料价格昂贵,给实际推广应用带来了不便。为了研究在不影响材料磁热性能前提下降低成本的途径,本文分别采用纯度为99.99%,99.6%和99%的Mn粉,结合机械合金化和放电等离子烧结技术制备了Mn1.2Fe0.8P0.75Ge0.26化合物,研究了Mn粉纯度对该化合物磁热性能的影响。结果表明,低纯度Mn粉并未显著降低该化合物的磁热性能。综合考虑成本节约,选用适当低纯度Mn粉有利于实际应用。
关键词: MnFePGe, 磁热性能 低纯度 Mn粉
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Influence of the Purity of Raw Material Mn on the Magnetocaloric Effect of Mn1.2Fe0.8P0.74Ge0.26 Compounds
Abstract:MnFePGe compounds combined with excellent magnetocaloric performance and easily available raw materials are room-temperature magnetic refrigerant materials which are expected to scale up. But the costly high-purity raw materials make their applications inconvenient. So how to cut the cost without affecting their performances is our purpose. In this paper, Mn1.2Fe0.8P0.75Ge0.26 compounds with 99.99%, 99.6% and 99% purity of Mn powders were prepared by mechanical alloying and spark plasma sintering, and the influence of Mn powders purity on magnetocaloric effect was investigated. It showed that the Mn powders with low purity had no great influence on the magnetocaloric performance. Thus considering the cost saving, properly lowering the purity of Mn powders is good to the practical applications.
Keywords: MnFePGe, magnetocaloric effect, low purity, Mn powder
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Mn原材料纯度对Mn1.2Fe0.8P0.74Ge0.26化合物磁热性能的影响研究
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