Study proprietes of porous piezoelectric ceramics and impregneed with polymere

Abstract
Interconnected Porous piezoelectric ceramics are fabricated over the range of porosity going from 25 % to more than 95 % starting from sintering of PZT-glucose mixtures. For a large porosity The ceramic has a cellular structure similar to that of a sponge. Porosity seems not affected , whereas d_h and k_t increases and kp decreases with porosity. The presence of interconnected porosity in ceramics causes a decoupling of the piezoelectric effects axial and radial for to privilege the axial mode. For a large porosity the transducer vibrates exclusively according to the axial. The polymer introduction into empty ceramics affects negatively the dielectric and piezoelectric properties, the dielectric losses increase whereas decreases strongly for cellular ceramics.