Grain-boundary diffusion of Nd147 in nanocrystalline Nd2Fe14B

The Nd self-diffusivity has been studied in nanocrystalline Nd-rich Nd2Fe14B. From the analysis of the diffusion profiles grain-boundary diffusion coefficients DGBNd are derived similar to the values observed recently for Fe59 diffusion in this material. Above the intergranular melting transition, a second diffusion path indicates rapid diffusion in the liquid intergranular phase.