Phase structure and magnetic properties of La/Ce substituted nanocomposite SmCo5/α-Fe magnets prepared by high energy ball milling and subsequent annealing
作者:Jinchao Chen、Fengqing Wang、Fang Wang、Fanbin Meng、Jian Zhang
DOI:10.1016/j.jmmm.2020.167534
日期:2021.3
Abstract The phase structures and magnetic properties of isotropic nanocomposite permanent magnetic materials with the nominal composition of (Sm1-xRx)Co5 (x = 0, 0.25, 0.5, 0.75, 1; R = La, Ce) + 25 wt% α-Fe prepared by high-energy ball milling and subsequent annealing have been investigated systematically. It is found that the phase structure of La-doped nanocomposite magnets is quite different from
摘要 标称成分为 (Sm1-xRx)Co5 (x = 0, 0.25, 0.5, 0.75, 1; R = La, Ce) + 25 wt% α-Fe的各向同性纳米复合永磁材料的相结构和磁性能已经系统地研究了通过高能球磨和随后的退火制备的。发现La掺杂纳米复合磁体的相结构与Ce掺杂的相结构大不相同。Ce掺杂纳米复合磁体的硬质相为2:7相,随着Ce含量和退火温度的增加(≤650℃)不变,而La掺杂纳米复合磁体的硬相从2:7相转变为1 :7 和 2:17 硬质相,随着 La 含量和退火温度的增加。La 和 Ce 掺杂纳米复合磁体的磁性能都显示出随着 La 或 Ce 含量增加而降低的趋势。磁滞回线的分析表明,La 和 Ce 掺杂的纳米复合磁体都表现出硬磁相和软磁相之间的强铁磁交换耦合。令人惊讶的是,尽管掺 Ce 的 Sm-Co 硬质相具有相对较高的本征磁性能,但掺 La 的 SmCo5/a-Fe