Mechanism of low-temperature radiation hardening in alkali halides. III. The elastic interaction of single halogen interstitials with dislocations

Abstract

The interaction of single halogen interstitials and dislocations has been studied in terms of their elastic interaction. The linear-elastic calculation is made to show that the maximum force in the I-center–dislocation interaction is greater than that in the case of the H center. This result is shown to be relevant for the elastic interaction of the HA and IA centers with dislocations. We reveal the relation between the maximum interaction force and the magnitude of strain around a defect, and conclude that the greater hardening effect of the interstitial ion than the atom originates from the stronger elastic-interaction force caused by the larger strain around the ion. The hardening effect of the interstitial ion is compared with that of the VK center.