A nickel oxide that is co-doped with a first alkali metal dopant and a second metal dopant may be used, for example, to form a dielectric material in an electronic device. The dielectric material may be used, for example, in a capacitor. The second metal dopant of the nickel oxide may be, for example, tin, antimony, indium, tungsten, iridium, scandium, gallium, vanadium, chromium, gold, yttrium, lanthanum, ruthenium, rhodium, molybdenum or niobium.