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Electron Localization and Metal — Nonmetal Transition in Alkali Metal — Alkali Halide Melts

The characteristic qualitative features of the metal —nonmetal (M —NM) transition in liquid alkalimetal —alkalihalide systems are briefly reviewed. The basic problem of electron localization in these melts is discussed in more detail on the basis of recent measurements of the electronic absorption spectra and electron mobilities. It is shown, that in salt rich melts formation of polarons previals, similar in character to the solid state Fcenter. Their mobility is determined by the ionic diffusion of the melt and has a magnitude characteristic of hopping conduction in states below the mobility edge. With increasing metal concentration spin pairing sets in and possibly bipolaron formation may be considered. The correspondance of these characteristics of the electronic structure and recent experimental results of the microscopic structure and thermodynamics of these salt rich solutions are discussed.