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Composite material was prepared from Bystr\"om-Evers metallic particlesAg5Pb2O6 dispersed in a semiconducting matrix CuO-Cu2O. Partial substitution ofCuO by Cu2O increases electric conductivity at 673 K for 2-3 orders ofmagnitude above Landauer conductivity e2/ha indicated by pure CuO matrix. Onsetof superconductivity at 86-375 K presented in this and previous works isdiscussed in the framework of the exciton-polariton mechanism occurring on thegrain surfaces.

Possible Exciton Mechanism of Superconductivity in Ag5Pb2O6/(CuO-Cu2O) Composite