Electrostrictive Effect in Barium Titanate Ceramics

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Abstract
When a direct current bias is applied to a multicrystalline barium titanate ceramic, an alternating voltage can excite resonances in the ceramic. Four modes of motion have been excited—a longitudinal mode at right angles to the applied field, a radial mode of a circular plate at right angles to the applied field, a thickness longitudinal mode, and a thickness shear mode. The first three are excited when the a.c. field is applied in the same direction as the d.c. polarization, but the fourth is excited when the a.c. field is at right angles to the d.c. polarization. The amount of motion is larger than in magnetostrictive materials, and it appears that barium titanate may be an important electromechanical transducing element.

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