J. Phys. IV France
Volume 123, March 2005
Page(s) 171 - 176

J. Phys. IV France 123 (2005) 171-176

DOI: 10.1051/jp4:2005123029

Study proprietes of porous piezoelectric ceramics and impregneed with polymere

K. Boumchedda1, J. Paletto2 and G. Fantozzi2

1  Laboratoire LMMC, Université de Boumerdes, 35000, Algérie
2  INSA de Lyon, Bât. 502, 69621 Villeurbanne, France

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 $d_{\hbox{\scriptsize\itshape 33}}$, whereas dh and kt 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 $d_{\hbox{\scriptsize\itshape 33}}$ decreases strongly for cellular ceramics.

© EDP Sciences 2005