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The Temperature Dependence of the Charge on Dislocations in NaCl and the Determination of the Separate Free Energies of Formation of Positive- and Negative-Ion Vacancies

✍ Scribed by R. W. Davidge

Publisher
John Wiley and Sons
Year
1963
Tongue
English
Weight
362 KB
Volume
3
Category
Article
ISSN
0370-1972

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✦ Synopsis

Abstract

The temperature dependence of the sign of the charge on edge dislocations is investigated for several crystals containing low impurity concentrations. Below a certain critical temperature (from 400 to 550 Β°C depending on the crystal) the dislocations have a negative charge whilst above this temperature they have a positive charge. Results are analyzed in terms of the theory of charged dislocations; the free energies of formation (at 0 Β°K) of positive‐ and negative‐ion vacancies at dislocation jogs are found to be g = (0.95 Β± 0.10) eV, g = (1.17 + 0.10) eV.

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