Preparation of submicron-sized Sm2Fe17N3 fine powder with high coercivity by reduction-diffusion process
Preparation of submicron-sized Sm2Fe17N3 fine powder with high coercivity by reduction-diffusion process
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DOI：
10.1016/j.jallcom.2016.10.306
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发表时间：
2017-02-25
影响因子：
6.2
通讯作者：
Enokido, Yasushi
中科院分区：
文献类型：
--
作者：
Okada, Shusuke;Suzuki, Kazuyuki;Enokido, Yasushi
采用一种新的亚微米Sm 2Fe 17粉末合成工艺和氮化工艺，并对粉末进行适当的后处理，制备了具有高介电常数的亚微米Sm 2Fe 17 N3粉末。由此可知，为了除去过剩的Ca而进行的清洗工序向Sm 2 Fe 17 N3的结晶结构供给氢，通过供给的氢使结晶结构沿着c轴伸长，结晶性降低。这种现象在粒径较小、分散性好的粉体中观察到。当对粉末进行脱氢处理时，它们显示出高的磁化率，正如从颗粒尺寸所预期的，并且0.5 μ m粉末的磁化率达到24.7kOe。Sm_2Fe_（17）N_3在亚微米尺度下保持了其固有的良好热稳定性。此外，在适当条件下进行崩解处理后，所得粉末显示出高的最大能量积。这项研究表明，高潜力的Sm 2Fe 17 N3超过性能的Nd-Fe-B磁体在热环境下。(C)2016爱思唯尔B. V.保留所有权利。
Submicron-sized Sm2Fe17N3 powders having high coercivity were prepared by a newly-developed synthesis procedure for submicron-sized Sm2Fe17 powders and nitridation process with a proper post-process for the powders. It was revealed that the washing step, which is performed to remove excess Ca, supplied hydrogen into the Sm2Fe17N3 crystal structure, and elongation of the crystal structure along the c-axis by the supplied hydrogen reduced coercivity. This phenomenon was observed clearly in powder with a smaller size and good dispersity. When the powders were subjected to dehydrogenation treatment, they showed high coercivity, as expected from the particle size, and coercivity of 24.7 kOe was achieved with the 0.5 mu m powder. The fact that the intrinsic good thermal stability of Sm2Fe17N3 is maintained at the submicron-scale was also confirmed. In addition, the obtained powder exhibited a high maximum energy product after disintegration treatment under appropriate conditions. This study demonstrated the high potential of Sm2Fe17N3 for surpassing the performance of Nd-Fe-B magnets under hot environments. (C) 2016 Elsevier B.V. All rights reserved.