Piezoelectric, dielectric and pyroelectric properties of 0-3 ceramic-polymer composites

The circular samples of composites were made from PZT ceramic gains dispers ed in polymers (epoxy or rubber). Pressure dependencies of the hydrostatic piezoelectric coefficient d(h) and permittivity epsilon were measured in th e range up to 60 MPa. The hydrostatic strain coefficient d(h), the hydrosta tic voltage coefficient g(h) and figure of merit d(h).g(h) were determined using the static method. The pressure dependence of the hydrostatic coeffic ients was measured for several successive cycles. Experimental dependence o f the charge on pressure and temperature was fitted by multi parameter func tion. The pressure and temperature dependencies of the hydrostatic d(h) and pyroelectric p(3) coefficients were determined. It was found that the hydr ostatic strain coefficient d(h) and hydrostatic voltage coefficient g(h) de creased and pyroelectric coefficient p(3) increased with pressure at consta nt temperature.