The coefficients and parameters of the temperature dependences of the coefficients of bulk diffusion of Fe, Co, Rh and Au atomic probes in iridium single crystals (mono-Ir) were determined from the diffusion profiles obtained by using secondary-ion mass spectrometry of the diffusion zones. The enthalpies of activation of diffusion of Fe, Co and Rh atomic probes were considerably lower than the enthalpy of activation of self diffusion in mono-Ir. This was caused by the negative contributions of the intra-atomic exchange energy and energy of relaxation of the environment of the d transition atomic probes to the enthalpy of interaction of magnetically active atomic probes with the vacancies in the iridium lattice. The interaction energy of partners in such complexes and the relationships between the magnetic moments of d transition atomic probes in complexes with vacancies were estimated. The Rh atomic probes in complexes with vacancies in iridium possessed stable magnetic moments.

Effect of the Magnetism of Impurities on their Diffusion in Metals - Bulk Diffusion of Iron, Cobalt, and Rhodium in Iridium Single Crystals. S.M.Klotsman, G.N.Tatarinova: The Physics of Metals and Metallography, 2008, 106[6], 604-15