Article comprising conductive film of crystalline bismuth mixed alkaline earth oxide containing silver

This patent describes an article comprised of a substrate bearing a conductive film. It comprises: grains of crystalline bismuth mixed alkaline earth copper oxide, characterized in that silver is present in the conductive film in a concentration of 1 to 20 percent, based on copper, the surface of the substrate bearing the film is substantially inert toward the film and is a crystalline perovskite, alkaline earth oxide, noble metal, zirconia or alumina, and the metal components of the oxide satisfy at least one of the following metal relationships