Structure and magnetic properties of bulk nanocrystalline SmCo7−xHfx sintered magnets
Structure and magnetic properties of bulk nanocrystalline SmCo7−xHfx sintered magnets
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DOI：
10.1063/1.2830557
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发表时间：
2008-01
影响因子：
3.2
通讯作者：
Dongtao Zhang;M. Yue;L. Pan;Yangchao Li;Gang Xu;Weiqiang Liu;Jiuxing Zhang;X. B. Liu;Z. Altounian
中科院分区：
文献类型：
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作者：
Dongtao Zhang;M. Yue;L. Pan;Yangchao Li;Gang Xu;Weiqiang Liu;Jiuxing Zhang;X. B. Liu;Z. Altounian
采用放电等离子烧结技术制备了SmCo 7 −xHfx（x= 0，0. 1，0. 2）块体纳米晶磁体，研究了其结构和磁性能。SmCo 7 −xHfx磁体具有TbCu 7型结构的单相。Rietveld结构精修的结果表明，铪更喜欢占据1a网站，这反过来又导致增强的SmCo 7化合物的各向异性场。显微组织分析表明，晶粒平均尺寸约为35 nm。随着Hf含量从x=0增加到0.2，矫顽力从0.89增加到2.08T。SmCo6.8Hf0.2磁体的矫顽力在300 ~ 773 K范围内随温度的升高而线性下降，从2.08 ~ 0.4T。
The structure and magnetic properties of the bulk nanocrystalline SmCo7−xHfx (x=0,0.1,0.2) magnets prepared using the spark plasma sintering technology were studied. SmCo7−xHfx magnet exhibits a single phase with the TbCu7-type structure. The Rietveld structure refinement results show that Hf prefers to occupy the 1a site, which in turn leads to an enhancement of the anisotropy field of the SmCo7 compounds. Microstructure analysis indicates that the average grains size is about 35nm. With increasing Hf contents from x=0 to 0.2, the coercivity increases from 0.89to2.08T. The coercivity of SmCo6.8Hf0.2 magnet decreases almost linearly from 2.08to0.4T with increasing temperatures from 300to773K.