›› 2015, Vol. 24 ›› Issue (1): 17504-017504.doi: 10.1088/1674-1056/24/1/017504
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
剧锦云a b, 唐旭a b, 陈仁杰a b, 汪金芝c, 尹文宗a b, 李东a b, 闫阿儒a b
Ju Jin-Yun (剧锦云)a b, Tang Xu (唐旭)a b, Chen Ren-Jie (陈仁杰)a b, Wang Jin-Zhi (汪金芝)c, Yin Wen-Zong (尹文宗)a b, Lee Don (李东)a b, Yan A-Ru (闫阿儒)a b
摘要: Fine-grained Nd10.79Pr2.8Al0.4B7.72Fe78.29 magnets were prepared by low temperature pre-sintering and subsequent hot pressing. The grain size of the magnets is just about 1-3μm because the low sintering temperature results in no grain growth. The orientation degree, microstructure, and magnetic properties were studied. Some grains' easy axes deviate from the orientation direction, possibly due to grain rotation during the hot pressing. By subsequent annealing, the magnetic properties were significantly enhanced. Especially, the squareness of the demagnetization curve was improved greatly. The enhancement of coercivity by annealing can be explained by an improvement of both grain boundaries and magnetic isolation, which decouples the exchange interaction between neighboring grains.
中图分类号: (Permanent magnets)