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Abstract
The effects of post-sintering heat treatments on the structure and properties in sintered Nd 15Fe 77B 8 magnets have been investigated. In the as-sintered sample, the crystal structure of the Nd-rich phase was f.c.c., while the Nd-rich phase transformed into a superlattice after heat treatment at 600°C for 1 h. However, the structures of Nd 2Fe 14B and B-rich (Nd 1+ϵFe 4B 4) phases did not change upon heat treatment. It is suggested that the formation of the superlattice enhances the coercivity of the magnets.
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