Effect of Thermal History on the Dislocation Substructure near the Surfaces of a Lithium Fluoride Crystal

Abstract

A series of x ray and etch pit experiments has been performed to determine some of the effects of temperature on the perfection of surface layers in LiF. It was found that the perfection of a cleaved surface is substantially increased at temperatures near the melting point, that rearrangement and annihilation of dislocations takes place at much lower temperatures, and that rapid cooling promotes the formation of shallow dislocation loops.