INTERGRANULAR INSULATION TYPE POLYCRYSTALLINE CERAMIC SEMICONDUCTIVE COMPOSITION

摘要

An intergranular insulation type semiconductive ceramic composition comprising a major proportion of strontium titanate (SrTiO3), a minor amount of niobium oxide (Nb2O5) or tantalum oxide (Ta2O5), a minor amount of either germanium oxide (GeO2) or zinc oxide (ZnO) and having diffused therein either bismuth oxide (Bi2O3) or a mixture of bismuth oxide, lead oxide (PbO) and boric oxide (B2O3). The material is especially useful as a capacitor.