Abstract
A model, describing losses in ferroelectric ceramics by the damped motion of 90° domain walls has been developed. The dependence of the complex dielectric, elastic and piezoelectric constants on the material properties P0 and S0 (spontaneous polarization and deformation), on the wall properties and on the directional distribution of the domains is derived. Measurements confirm this phenomenological, two dimensional theory, thus indicating the domain wall dampaing being the dominant loss mechanism in these ceramics.
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