Abstract
T he effects of vacancy and F-centre concentrations on the room temperature creep properties of NaCl single crystals were studied. Under a load of 1,200 gm/mm 2, logarithmic creep behaviour was found for both annealed and quenched crystals before or after irradiation. Irradiation with 50 kV X-rays was found to have a marked effect on both initial deformation and subsequent creep, causing an initial softening followed by a hardening as irradiation is continued. The behaviour after irradiation can be explained on the basis of the changes in vacancy concentration and distribution which accompany F-centre formation. Experiments in which the vacancy concentration was changed by quenching from various temperatures indicate that the creep rate may depend in a simple way on the number of vacancies.
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