Strain-rate cycling tests during Blaha-effect measurements were carried out at 83 to 239K in order to study the force-distance relationship between a dislocation and aggregates in Sr2+-doped (0.05mol% in the melt) single crystals. On the basis of the dependence of strain-rate sensitivity, due to aggregates, upon temperature it was found that the interaction between a dislocation and the aggregate could not be approximated by the Fleischer model. A square force-distance relationship between a dislocation and an impurity seemed to be the most suitable model when compared with a parabolic one and a triangular one; taking account of the Friedel relationship for the specimen. The values of the enthalpy and the Gibbs free activation energy for the overcoming of the aggregate by a dislocation were obtained for the 3 force-distance relationships.

Study of the Interaction between a Dislocation and Impurities in KCl:Sr2+ Single Crystals by the Blaha Effect II - Interaction between a Dislocation and Aggregates for Various Force-Distance Relations between a Dislocation and an Impurity. Y.Kohzuki, T.Ohgaku: Journal of Materials Science, 2001, 36[4], 923-8