Transition-metal and rare-earth diffusion coefficients were determined at 1323K, in (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 coefficient of Co was 7.63 x 10-10cm2/s.

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