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On the Calculation of Self‐Diffusion and Impurity Diffusion Coefficients with the Aid of Elastic Constants
Author(s) -
Neumann G.
Publication year - 1986
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.2221370107
Subject(s) - arrhenius plot , diffusion , effective diffusion coefficient , self diffusion , impurity , thermodynamics , arrhenius equation , zener diode , curvature , fick's laws of diffusion , activation energy , grain boundary diffusion coefficient , materials science , chemistry , condensed matter physics , physics , mathematics , quantum mechanics , geometry , organic chemistry , self service , voltage , resistor , business , magnetic resonance imaging , marketing , radiology , medicine
It is demonstrated that the diffusion model proposed by Varotsos and Alexopoulos implicitely includes a correlation between diffusion energy H and entropy S analogous that deduced by Wert and Zener. For the impurity diffusion via vacancies this correlation between H and S is not correct. Thus, the model of Varotsos and Alexopoulos is not applicable to the impurity diffusion. For self‐diffusion the model roughly approximates the temperature function of the diffusion coefficient D 0 , however, it is unable to describe the curvature of the Arrhenius plot of D 0 .
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