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首页> 外文期刊>Applied Physics Letters >Structure and magnetic properties of bulk nanocrystalline SmCo_(6.6)Nb_(0.4) permanent magnets
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Structure and magnetic properties of bulk nanocrystalline SmCo_(6.6)Nb_(0.4) permanent magnets

机译：块状纳米SmCo_（6.6）Nb_（0.4）纳米永磁体的结构和磁性

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摘要

The crystal structure and magnetic properties were studied for the bulk nanostructural permanent magnet SmCo_(6.6)Nb_(0.4) prepared by spark plasma sintering method. The magnet crystallizes in a single phase with a hexagonal TbCu_7-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 30 nm. The coercivity decreases almost linearly from 2.8 to 0.5 T with increasing temperature from 300 to 773 K. A remanence enhancement resulting from intergrain exchange coupling among the fine grains was also observed.
机译：研究了通过火花等离子体烧结法制备的块状纳米结构永磁体SmCo_（6.6）Nb_（0.4）的晶体结构和磁性。在烧结过程之后，磁体以六方相TbCu_7型晶体结构单相结晶。 Rietveld拟合结果表明，Nb的合金元素倾向于占据3g位置。显微组织观察表明，平均晶粒尺寸为约30nm。随着温度从300 K升高至773 K，矫顽力几乎从2.8 T线性降低至0.5T。还观察到细晶粒之间晶间交换耦合导致的剩磁增强。

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