Abstract:Traces of non‐magnetic atoms at the grain boundaries can effectively increase the coercivity of sintered Nd–Fe–B magnets. These atoms also have chance to occupy crystallographic Fe sites in Nd2Fe14B, which may force the unbound Fe to precipitate at the grain boundaries and thus destroy the nonmagnetic properties of the grain boundaries. In order to provide the thermodynamic evidences of Fe migration to the grain boundaries, one Zn diffusion reaction in Nd2Fe14B is investigated by scanning electron microscopy a… Show more
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