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On the Theory of Diffusion in Amorphous Metals
Author(s) -
Davydov L. N.,
Spolnik Z. A.
Publication year - 1995
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221910106
Subject(s) - activation energy , diffusion , effective diffusion coefficient , percolation (cognitive psychology) , thermodynamics , amorphous solid , percolation theory , materials science , metal , range (aeronautics) , chemical physics , chemistry , physics , crystallography , metallurgy , conductivity , composite material , neuroscience , biology , medicine , radiology , magnetic resonance imaging
Diffusion in solids with random activation energy of individual jumps is analyzed. The experimentally observed relation between the activation energies of diffusion for metal glasses and for the corresponding crystals is explained under reasonable assumptions. The activation energy is shown to be not the most probable buth rather close to the minimum allowed (by the percolation mechanism) activation energy of individual jumps. For an interstitial solute the activation energy parametrically depends on the mean solute concentration. The expression for the diffusion coefficient is obtained. The short‐range diffusion is also considered.