Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1802935 | Journal of Magnetism and Magnetic Materials | 2009 | 6 Pages |
Abstract
Microstructures of fine grained Nd–Fe–B sintered magnets that were produced by the pressless process were investigated to understand the origin of the sudden coercivity decrease below a certain grain size. The intrinsic coercivity is inversely proportional to ln D2 with the highest coercivity of 17 kOe at D∼4.5 μm, below which the coercivity drops as the grain size decreases. We found that the degradation of the coercivity of the magnet with a grain size of 3 μm was mainly caused by the inhomogeneous distribution of fcc-Nd oxide whose volume fraction increased with respect to the dhcp Nd-rich phase.
Related Topics
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Condensed Matter Physics
Authors
W.F. Li, T. Ohkubo, K. Hono, M. Sagawa,