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piezoelectric effect

piezoelectric effect (pīē´zōĬlĕk´trĬk), voltage produced between surfaces of a solid dielectric (nonconducting substance) when a mechanical stress is applied to it. A small current may be produced as well. The effect, discovered by Pierre Curie in 1883, is exhibited by certain crystals, e.g., quartz and Rochelle salt, and ceramic materials. When a voltage is applied across certain surfaces of a solid that exhibits the piezoelectric effect, the solid undergoes a mechanical distortion. Piezoelectric materials are used in transducers, e.g., phonograph cartridges, microphones, and strain gauges, which produce an electrical output from a mechanical input, and in earphones and ultrasonic radiators, which produce a mechanical output from an electrical input. Piezoelectric solids typically resonate within narrowly defined frequency ranges; when suitably mounted they can be used in electric circuits as components of highly selective filters or as frequency-control devices for very stable oscillators.

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piezoelectric effect

piezoelectric effect Creation of positive electric charge on one side of a nonconducting crystal and negative charge on the other when the crystal is squeezed. The pressure results in an electric field that can be detected as voltage between the opposite crystal faces. The effect has been used in gramophone pickups, crystal microphones, and cigarette lighters.

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