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OALib Journal期刊
ISSN: 2333-9721
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Mn1.2Fe0.8P0.76Ge0.24磁制冷材料相变过程与磁性能关系的研究
DOI: 10.3724/SP.J.1037.2012.00775, PP. 783-788
Keywords: 磁制冷材料,磁热相变过程,中子衍射
Abstract:
利用机械合金化(MA)结合放电等离子烧结(SPS)技术,制备了Mn1.2Fe0.8P0.76Ge0.24磁制冷材料,并采用SEM观察烧结样品的显微组织,利用中子衍射、超导量子干涉磁强计(SQUID)、差示扫描量热仪(DSC)和X射线衍射(XRD)等手段对相变过程和磁热性能进行了研究.结果表明烧结样品显微组织均匀致密,Mn1.2Fe0.8P0.76Ge0.24化合物具有六方Fe2P型晶体结构.外加磁场和温度的变化都可以引起材料的磁热相变,即顺磁相与铁磁相之间的可逆一级相变.材料的磁熵变与相转变的程度有密切关系,随着外加磁场的增大或温度的降低,合金由顺磁相向铁磁相转变,从而使材料磁熵变增大.分析发现,材料的磁熵变大小与相转变过程中发生转变的相变百分比是直接对应的,温度诱导相变与磁场诱导相变所得结果一致.
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