Abstract TbHx nanoparticles were applied to prepare sintered MM-Fe-B magnet by using grain boundary diffusion technique. Under optimal processing conditions, the coercivity and maximum energy product substantially increase by 383% and 151%, reaching to 6.81 kOe and 20.18 MGOe, respectively. Further investigation indicates that the interchange between Tb atoms and Ce atoms leads to a core/shell structure with (MM,Tb)2Fe14B phase in the surface region of MM2Fe14B matrix grains in the magnet. The modified structure successfully restrains the magnetic domain reversal process, resulting in remarkable enhancement of coercivity and maximum energy product of the magnet.

中文翻译：

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具有优异能量密度的MM-Fe-B基间隙磁铁

摘要 应用晶界扩散技术，将TbHx纳米颗粒用于制备烧结MM-Fe-B磁体。在最佳加工条件下，矫顽力和最大能积大幅提高了 383% 和 151%，分别达到 6.81 kOe 和 20.18 MGOe。进一步研究表明，Tb 原子和 Ce 原子之间的交换导致磁体中 MM2Fe14B 基体晶粒表面区域具有 (MM,Tb)2Fe14B 相的核/壳结构。改进的结构成功地抑制了磁畴反转过程，从而显着提高了磁体的矫顽力和最大能积。