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A Theoretical Analysis of Cation Diffusion in Potassium Azide
Author(s) -
Danemar A. G.,
Royce B. S. H.,
Welch D. O.
Publication year - 1974
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.2220650113
Subject(s) - diffusion , vacancy defect , anisotropy , chemistry , ion , thermodynamics , self diffusion , tracer , tensor (intrinsic definition) , crystallography , physics , mathematics , nuclear physics , geometry , optics , self service , organic chemistry , marketing , business
A theoretical analysis has been made of the temperature dependence and anisotropy of the self‐diffusion of tracer potassium ions in KN 3 . A vacancy mechanism is assumed, and the effects of correlation on diffusion are examined. An approximate analytic expression is obtained for the correlation factor, and its validity is determined by comparison with more accurate numerical calculations. The temperature dependence of the elements of the diffusion tensor including correlation is evaluated, making use of theoretical values of the migration energy of cation vacancies, and the role of correlation in determining the crystallographic anisotropy of cation diffusion is discussed. Comparison is made to available experimental data.