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The creep behavior of single‐crystal lithium fluoride was investigated over the temperature range 650–750°C. The behavior was similar to that observed in the case of pure metals. The strain rate was found to be proportional to the (stress)n with n taking values of 5.11 for T=650°C and 700°C and 3.74 for T=750°C. The activation energy for creep was 2.09 eV, the value expected for the diffusion of the fluorine ion. The results suggest that creep at high temperatures is due to diffusion‐controlled dislocation motion.