Pierre and Jacques Curie discover piezoelectricity

Background. Piezoelectricity is defined as the electric charge accumulating in solid materials like crystals in response to mechanical stress. This phenomenon results from linear electromechanical interactions in crystalline materials that lack inversion symmetry. The term itself was coined later, in 1881, by German physicist Wilhelm Gottlieb Hankel.

Discovery. Pierre and Jacques Curie, brothers and French physicists, demonstrated the direct piezoelectric effect in 1880. They showed that an electric potential was generated when crystals were compressed. This discovery was a major legacy for Jacques, though historical accounts often emphasize Pierre's role. Their work laid the foundation for understanding electromechanical interactions in crystals.

Legacy. The Curies' discovery remained a laboratory curiosity for decades. In 1881, Gabriel Lippmann mathematically deduced the converse effect, which the Curies immediately confirmed. The Curies went on to obtain quantitative proof of the complete reversibility of electro-elasto-mechanical deformations in piezoelectric crystals, solidifying the theoretical framework of the phenomenon.