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The formation energy g+ of an individual cation vacancy in LiF and NaCl has been measured by means of the temperature dependence of the electrical signals produced by push-pull deformation of bent crystals and application of the theory of charged dislocations. For LiF: g+=0.74±0.04 eV at 680°K. For NaCl: g+=0.75±0.04 eV at 627°K and 0.72±0.04 eV at 761°K. A comparison with other published results for NaCl reveals some unexplained disagreement.
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Spencer et al. (1969) studied this question.
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