The creep behaviour of polycrystalline lithium fluoride under conditions of constant stress was investigated over the temperature range from 300°C to 550°C and found to be essentially similar to that observed in pure metals. The measured activation energy for steady-state creep was of the anticipated magnitude for diffusion of the fluorine ion, and the results suggest that the rate-controlling mechanism is some form of dislocation motion rather than the stress-directed diffusion of vacancies.
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Cropper et al. (1968) studied this question.
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