| 简介 |
[Problem] To provide a permanent magnet or the like that has, as the main phase, a compound having an Nd5Fe17-type crystal structure that exhibits a high residual magnetization and coercive force. [Solution] This permanent magnet contains R and T (where : R represents one or more rare-earth elements that essentially include Sm; T represents Fe or one or more transition metal elements that essentially include Fe and Co). In this permanent magnet, the compositional ratio of R is 20-40 at%, and the remaining portion is substantially only T or only T and C. The contained amount of T is more than 1.5-fold but less than 4.0-fold of the contained amount of R. The main phase particles included in the permanent magnet have an Nd5Fe17-type crystal structure. The main phase particles of the permanent magnet have an average crystal grain size greater than 1 μm. The number percentage of the main phase particles having a crystal grain size of less than 0.4 μm is less than 20%. |
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