Abstract
An accurate measurement has been made of the activation energy (0.85 eV) of the aggregation of Pb2+ vacancy pairs in NaCl:Pb2+, using measurements of the intensity of the dielectric absorption. This is compared with the enthalpy of diffusion (0.98 eV) for a Pb2+ vacancy pair in NaCl. The significance of the difference is discussed in relation to the concentration of dimers which may occur in doped alkali halides.
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