(1) International Centre for Theoretical Physics, Strada Ostiera 11, I-34014 Trieste, Italia;(2) Physics Department, University of Instanbul, Istanbul, Turkey;(3) Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italia
Abstract:
Summary We outline a theory for the metal-non-metal transition occurring in solutions of alkali metals in molten alkali halides as
governed by a balance between the binding of ionic clusters by localized electrons and the excess free energy of an ionic
assembly screened by metallic electrons. In the model the transition is driven by the composition dependence of the screening
length. The theory is amenable to an analytic solution within the mean spherical approximation when Thomas-Fermi screening
is used and the ions are described by charged hard spheres.