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The article presents the comparative analysis of the polyanion effect at its manifestation in the pure form, i.e. with the participation in the electromigration process of only halide-ions with the polyalkali effect. It was shown that expressions used to calculate the electrical conductivity of two-alkali glasses, can not be directly applied to calculate the electrical conductivity of two-halide glasses. Analytical expressions for such calculation are proposed, giving a satisfactory compliance of calculated and experimental data.

Polyanion effect in glasses of the pseudo-binare system PbO <sup>.</sup> SiO<sub>2</sub> - Pb(F,Cl)<sub>2</sub>