capacitor dielectric and piezoelectric ceramics: Quick Facts

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Figure 1: Ferroelectric properties of barium titanate (BaTiO3). (Left) Above 120° C the structure of the BaTiO3 crystal is cubic, and there is no net polarization of charge; (right) below 120° C the structure changes to tetragonal, shifting the relative positions of the ions and causing a concentration of positive and negative charges toward opposite ends of the crystal.

Diagram of a multilayer capacitor with alternating thin layers of metal electrodes and ceramic dielectric inside a green plastic coating, and two wire leads extending outward.

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