A theory is presented to describe ionic distributions in compensated crystalline lattices in the intermediate temperature region in which dissociation of ionmdash;defect pairs becomes significant. A conceptual model of an assembly of independent ionmdash;defect pairs in equilibrium with unassociated ions and defects is introduced. The problem of volume exclusion evolves as a natural consequence in the interpretation of the model. Calculations for the KCl:Sr2plus;, and NaCl:Sr2plus;systems are displayed and related to transport properties.
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