烧结温度对Mn_(1.2)Fe_(0.8)P_(0.73)Ge_(0.27)磁热性能及微观组织的影响

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英文篇名：Magnetocaloric properties and microstructures of Mn_(1.2)Fe_(0.8)P_(0.73)Ge_(0.27) alloy prepared at different temperatures 作者：梁允田 ; 王少博 ; 徐国梁 ; 张振路 ; 刘丹敏 英文作者：LIANG Yun-tian;WANG Shao-bo;XU Guo-liang;ZHANG Zhen-lu;LIU Dan-min;Institute of Microstructure and Property of Advanced Materials,Beijing University of Technology; 关键词：MnFePGe ; 烧结温度 ; 磁热性能 ; 晶粒尺寸 英文关键词：MnFePGe;;sintering temperatures;;magnetocaloric property;;grain size 中文刊名：电子显微学报 英文刊名：Journal of Chinese Electron Microscopy Society 机构：北京工业大学固体微结构与性能研究所; 出版日期：2019-08-15 出版单位：电子显微学报 年：2019 期：04 基金：国家自然科学基金资助项目(No.51671006) 语种：中文; 页：37-41 页数：5 CN：11-2295/TN ISSN：1000-6281 分类号：TB64

摘要

通过机械合金化结合等放电离子烧结技术,采用不同烧结温度制备名义成分相同的Mn_(1.2)Fe_(0.8)P_(0.73)Ge_(0.27)样品。使用X射线衍射仪(XRD)、差示扫描热量分析仪(DSC)、扫描电镜(SEM)研究了不同烧结温度对材料的成分、晶粒大小和磁热性能的影响。结果表明,材料均保持六方Fe_2P结构。随烧结温度的升高,居里温度下降,晶粒长大,熵变上升;而杂相Ge_6Fe_3Mn_4向Mn_(1.2)Fe_(0.8)P_(0.73)Ge_(0.27)主相转化,而氧化物的含量基本不发生变化。
        Mn_(1.2)Fe_(0.8)P_(0.73)Ge_(0.27) alloys with the same initial component were prepared at different sinter temperatures by mechanical alloying and spark plasma sintering technique. The magnetocaloric properties and microstructures were investigated by X-ray diffraction( XRD),differential scanning calorimetry( DSC),scanning electron microscope( SEM). The results show that samples crystalize in the hexagonal Fe_2P-type structure. When the sintering temperatures rises,the Tc decreases,grain grows and the entropy change increases. The Ge_6Fe_3Mn_4 transformed to Mn_(1.2)Fe_(0.8)P_(0.73)Ge_(0.27) with the rise of sintering temperature,while no change with MnO content were found.

引文

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