Structure and magnetic properties of bulk nanocrystalline SmCo6.6Nb0.4 permanent magnets
Structure and magnetic properties of bulk nanocrystalline SmCo6.6Nb0.4 permanent magnets
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DOI：
10.1063/1.2749182
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发表时间：
2007-06
影响因子：
4
通讯作者：
M. Yue;J. Zhang;D. Zhang;L. Pan;Xuedong Liu;Z. Altounian
中科院分区：
文献类型：
--
作者：
M. Yue;J. Zhang;D. Zhang;L. Pan;Xuedong Liu;Z. Altounian
研究了放电等离子烧结法制备的块状纳米结构永磁体SmCo6.6Nb0.4的晶体结构和磁性能。烧结过程后磁体结晶为具有六方TbCu7型晶体结构的单相。 Rietveld拟合结果表明合金元素Nb更倾向于占据3g位点。显微组织观察表明，平均晶粒尺寸约为30nm。随着温度从 300K 升高到 773K，矫顽力几乎从 2.8T 线性降低到 0.5T。还观察到细晶粒之间的晶粒间交换耦合导致剩磁增强。
The crystal structure and magnetic properties were studied for the bulk nanostructural permanent magnet SmCo6.6Nb0.4 prepared by spark plasma sintering method. The magnet crystallizes in a single phase with a hexagonal TbCu7-type crystal structure after the sintering process. Rietveld fitting results show that the alloying element of Nb prefers to occupy the 3g site. Microstructure observation indicates that the average crystal grain size is about 30nm. The coercivity decreases almost linearly from 2.8to0.5T with increasing temperature from 300to773K. A remanence enhancement resulting from intergrain exchange coupling among the fine grains was also observed.