The origin of coercivity decrease in fine grained Nd-Fe-B sintered magnets |
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Authors: | W.F. Li K. Hono M. Sagawa |
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Affiliation: | a National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan b Intermetallics Co. Ltd., Kyoto 615-8206, Japan |
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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. |
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Keywords: | 75.50.Ww 68.37.Hk |
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