Transition-metal and rare-earth diffusion coefficients were determined at 1323K, in the (Fe1-xCox)14Dy2-yNdyB samples, by means of the field emission energy dispersive spectroscopic compositional analysis of diffusion couples. Estimates of the mutual interdiffusion coefficients were deduced by preparing arc-melted and annealed polycrystalline specimens. It was assumed that the diffusion coefficients were independent of concentration. Fifteen couples were heat-treated at 1323K for various times, and the results indicated that the diffusion coefficients of Fe (3.28 x 10-10cm2/s) and Co (7.63 x 10-10cm2/s) were significantly higher at 1323K in this system than were those of Dy (2.9×10-12cm2/s) and Nd (2.3 x 10-12cm2/s).

Diffusion of Fe, Co, Nd and Dy in R2(Fe1-xCox)14B where R = Nd or Dy. B.A.Cook, J.L.Harringa, F.C.Laabs, K.W.Dennis, A.M.Russell, R.W.McCallum: Journal of Magnetism and Magnetic Materials, 2001, 233[3], 136-41