The Electromigration, Thermal Convection, and Electroconvection, Diffusion of Atoms and Atomic Groupings in Melts. 2. Regularity and Mechanisms of Diffusion in Metallic Melts

摘要

Based on reliable experimental data and analysis of theoretical works, authors make a conclusion about correctness of linear temperature dependence of atomic diffusion coefficients in the wide temperature range. As shown, temperature, mass and volume (size) dependences of atomic diffusion coefficients in liquid metals are in a good agreement with non-activation rigid-spheres' model of a liquid. A crucial influence of both O and N impurities on formation of complexes in melts is revealed. As shown, the number of atoms in complex is raised with increase of valence of observable metallic impurities. As supposed, these complexes are formed due to polarization of bonds and hybridization of atomic orbitals.