Approach to metallic behavior in metal molten-salt solutions

A combined molecular-dynamics density-functional simulation of concentrated Kx(KCl)1-x solutions with x0.11 has been performed. Bipolaronic structures where two spin-paired electrons are trapped in the same liquid cavity are seen to be a characteristic feature of this mixture. The bipolarons exhibit a tendency to clustering. At x0.11 the bipolaronic clusters tend to have an elongated percolating structure which leads to metallic behavior. Our findings are in good agreement with available experimental information.