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Cermaics and glass-ceramics are principally known in industry for their good electrical insulation properties. However, some glass-ceramics exhibit other unusual electrical characteristics. The suitability of the various routes for producing glass-ceramics with specific properteis for particular applications are discussed. These include piezoelectric and pyroelectric materials, high-dielectric-constant materials for use in capacitors, materials whose dielectric constant varies with temperature, electro-optic materials, and superconductors.