Abstract
Abstract We suggest a simple ad hoc, criterion for hard-sphere radius determination. The set of alkali halide radii calculated is compared with that obtained from a fitting procedure described elsewhere. The deviation does not exceed 10% for the most of elements. The method makes use of a radial distribution function (RDF) for alkali halide crystals. For the first time, we present a simple analytic expression for the RDF of such a system. The RDF calculation employs semiempirical potentials to describe effective ionic interactions.
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