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Applying semi-analytical models of nonideal plasma, we evaluate the behaviorof the metallic phase in metal-ammonia solutions (MAS). This behavior is mainlycontrolled by the degenerate electron gas, which remains stable down to 5 MPMdue to high solvent polarizability and strong dielectric screening of solvatedions. Comparing the behavior of the metallic state with those of localizedsolvated electrons, we have estimated the miscibility gap $\Delta n$ forvarious alkali metals and found $\Delta n$(Na)$> \Delta n($K$)$. It is rathernarrow in Rb-NH$_3$ and does not occur in Cs-NH$_3$ solutions, which is in fullagreement with the experiments. The case of Li is discussed separately. Thedifference calculated in the excess free energies of the metallic andnonmetallic phases is in the order of $k_BT$, yielding a thermally fluctuatingmixed state at intermediate metal concentrations. It results in a continuousmetal-nonmetal (MNM) transition above the consolute point $T_c$ and a phaseseparation below $T_c$. We propose a criterion for the MNM transition which maybe attributed to the line of the maximum of compressibility above $T_c$. Thisline crosses the spinodal one at the critical temperature. Finally, we assertthat a new electronic phase similar to microemulsion should also arise betweenthe spinodal and the binodal lines.

Nature of metal-nonmetal transition in metal-ammonia solutions. II. From uniform metallic state to inhomogeneous electronic microstructure