Pressure Dependence of the Mobility of Dislocations in Lithium Fluoride Crystals

Publisher Website
Google Scholar
Abstract
Recently published measurements of the pressure dependence of dislocation mobility and of the macroscopic yield stress in LiF are discordant. To resolve this divergence of results, the effect of hydrostatic pressure on the yield strength for glide on the primary slip system of LiF single crystals has been measured by two methods: observation of dislocation etch pits and by stress‐strain curves. As predicted by the microdynamical theory of plasticity, the same results are obtained by the two methods. The change in mobility of screw dislocations in LiF due to hydrostatic pressure is found to be unusually small as compared to that in other ionic crystals, and the formation of point defects as the rate‐limiting step in controlling the velocity of screw dislocations is ruled out.

This publication has 4 references indexed in Scilit: