Evidence for the production of debris by moving dislocations in sodium chloride

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Abstract
Several kinds of etch pit are formed when NaCl is etched with a mixture of acetic acid and methyl alcohol. In particular, slip bends contain shallow pointed pits in addition to the normal pits formed et dislocations. The density of these shallow pits is reduced by an anneal at around 300°c before etching, and it is believed that they originate at debris, left behind moving dislocations. Debris is also produced by the to and fro motion of edge and screw dislocations in crystals vibrated at high amplitudes at 90 kc/s, and this effect is related to a decrease in the internal friction. Experiments on LiF show that three etches which reveal dislocations differ in the extent to which they also reveal debris.