Titania (TiO₂) ceramics occupy a niche where high dielectric constant, voltage-withstanding capability and moderate mechanical properties intersect. They are most commonly encountered as capacitor substrates, varistor bodies, voltage-dependent resistors and microwave dielectric resonators.
Beyond electronics, titania finds use as a catalyst support (its surface chemistry is highly active), as a wear-resistant coating precursor, and in certain biomedical applications where its biocompatibility and photocatalytic activity are advantageous. Pure rutile-phase titania has a dielectric constant exceeding 100, making it valuable for miniaturising capacitive components.