Sn and Sb diffusion in α-Fe

The effect of the magnetic ordering on the diffusion of Sri and Sb in alpha -Fe was investigated. Measurements were made in an extended temperature range: (673-1163 K) and (673-1073 K) respectively, using several techniques like Rutherford Backscattering Spectrometry (RBS), Heavy Ion RBS (HIRBS) and serial sectioning, in superposed ranges of temperature. By spanning the temperature range with respect to the previous works, the Arrhenius plot shows the variation of the slope at the Curie temperature and a slightly curvature in the ferromagnetic region. The curvature observed is well fitted by the model developed by Ruch et al. The parameter that takes into account the influence of the magnetic order in the vacancy mobility during the Sri and Sb diffusion process is quite similar to that observed in Fe self-diffusion; then, no magnetic interaction between the impurities and the matrix is postulated.