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Cation Vacancy Migration Entropy in Alkali Halides
Author(s) -
Eftaxias K.,
Varotsos C.,
Hadjicontis V.
Publication year - 1988
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.2221470106
Subject(s) - vacancy defect , alkali metal , halide , thermodynamics , entropy (arrow of time) , chemistry , materials science , inorganic chemistry , physics , crystallography , organic chemistry
Varaksin and Shipitsin have recently presented a method for the calculation of the migration entropy ( s m ) of defects in solids. By applying this method to the case of a cation vacancy migration in NaCl and KCl values are obtained that significantly differ from the experimental data. On the other hand a model is suggested which leads to reliable s m ‐values for both materials i.e. NaCl and KCl. This model is based on a reasonable assumption stating that the absolute value of the “constant volume” migration entropy is appreciably smaller than that corresponding to “constant pressure”.