Title :
Domain contributions to piezoelectricity in ceramics
Author_Institution :
Inst. fuer Werkstoffe der Elektrotech., Aachen Univ. of Technol.
Abstract :
In research on perovskite ceramics it has long been assumed that domain wall motion could contribute considerably to the dielectric constant. In addition, the effects of the 90° domain wall motion have been recognized to contribute to the elastic and piezoelectric constant. A model which describes these contributions phenomenologically is used to separate intrinsic effects from domain wall contributions. The various observations of piezoelectricity at low and high temperatures and at medium and high frequencies which can be attributed to 90° domain wall contributions are discussed in the framework of the model. An analysis of relaxational effects which contribute to all three physical phenomena, i.e. permittivity, elasticity, and piezoelectricity, is given. It is concluded that intrinsic effects cause the observed relaxation
Keywords :
ceramics; dielectric relaxation; elastic constants; electric domain walls; permittivity; piezoelectric materials; ceramics; dielectric constant; domain wall motion; elasticity; intrinsic effects; model; permittivity; perovskite ceramics; piezoelectric constant; piezoelectricity; relaxational effects; Aging; Boundary conditions; Ceramics; Crystallization; Dielectric constant; Dielectric measurements; Ferroelectric materials; Grain boundaries; Piezoelectric polarization; Piezoelectricity;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171463
