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

Publisher Website
Google Scholar
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 °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 °K) of positive‐ and negative‐ion vacancies at dislocation jogs are found to be g = (0.95 ± 0.10) eV, g = (1.17 + 0.10) eV.