On the possibility of existence of a new type of interface acoustic waves at 180° ferroelectric domain boundary

Mozhaev, V.G.; Weihnacht, M.

Авторы: Mozhaev V.G., Weihnacht M.
Сборник: 1995 IEEE Ultrasonics Symposium Proceedings
Том: 1
Год издания: 1995
Издательство: Institute of Electrical and Electronics Engineers
Местоположение издательства: Piscataway, NJ, United States
Первая страница: 649
Последняя страница: 652
DOI: 10.1109/ULTSYM.1995.495656
Аннотация: The possibility of existence of a new type of interface acoustic waves (IAW) at 180° ferroelectric domain boundary in single-crystal barium titanate is predicted. Contrary to the known shear-horizontal (SH) interface acoustic wave at such a boundary, the predicted wave for crystallographic propagation direction is polarized in the sagittal plane, that is, the wave is of so-called shear-vertical (SV) polarization, and it has only longitudinal nonzero displacement component at the boundary. The waves become quasi SH-IAW and quasi SV-IAW with a deviation of propagation directions from crystallographic axes. A study of the azimuthal dependence of the wave velocities in the plane of domain boundary shows that quasi SV-IAW exists only in a limited range of the angles (29°-sector) near the direction of spontaneous polarization. In the absence of piezoelectric effect, SV-IAW propagating along crystallographic direction transforms into the interference of two equal-amplitude limiting bulk waves. The feature of this type of wave solution is its existence only under the condition of concavity of slowness surface for quasi-shear bulk waves in sagittal plane. As a result of that a SV-IAW in PZT-4 piezoceramics does not exist
Добавил в систему: Можаев Владимир Геннадиевич

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On the possibility of existence of a new type of interface acoustic waves at 180° ferroelectric domain boundaryстатья

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