The rebinder effect and the adsorption-locking of dislocations in lithium fluoride

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Abstract
Aqueous solutions of long-chain fatty acids can serve as etchants for lithium fluoride. Using such etchants it has been possible to study the effects of various environments on the cross-gliding of screw dislocations at the surface of a crystal. The observations suggest that chemisorbed polar molecules restrict the motion of screw dislocations via ‘adsorption-locking’. An estimate of the possible strength of such locking is made and its existence confirmed by studies on the yielding behaviour of lithium fluoride crystals. In contrast to Rebinder's observations with metal crystals, adsorbed polar molecules cause an increase in yield and critical resolved shear stresses before inducing the lower rate of work-hardening commonly known as the Rebinder effect.