The velocity of dislocations in ice—a theory based on proton disorder

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Abstract
The disorder of the protons on the bonds in ice Ih presents an obstacle to the glide of dislocations (Glen 1968). Assuming this to be the rate-limiting process, this paper develops theories for the velocity of a kink along an otherwise straight dislocation and for the velocity of a highly flexible dislocation line. If the mean time between reorientations of a given bond is taken to be twice the dielectric relaxation time, the dislocation velocity deduced from these theories is at least an order of magnitude less than that observed experimentally. It is concluded that bonds near dislocations reorient faster than those in the rest of the crystal.

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