Abstract
Bystrom–Evers compound Ag5Pb2O6 is highly conducting oxide, and it was prepared from the components Ag2O and PbO2 fired in a 300 bar O2 atmosphere and 623 K. Compound was milled, and particles were dispersed in a powdered CuO matrix. For low concentrations of metallic particles ( 48 w/w percents material is metallic down to liquid helium temperatures. For intermediate concentrations, the composite exhibits properties characteristic for superconductors with transition temperatures 178 K<T c<356 K, dependent on the size of dissolved metallic particles and their mutual distance. Magnetic data support a presumption of novel superconductivity. Samples were prepared with SC transition temperature T c=138 K, and in the temperature range 145–800 K electric resistance obeys the temperature dependence ln R∼(T 0/T)1/2, and this indicates a possible 1-dimensional conduction mechanism.
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