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

The circular samples of composites were made from PZT ceramic gains dispersed in polymers (epoxy or rubber). Pressure dependencies of the hydrostatic piezoelectric coefficient d(h) and permittivity epsilon were measured in the range up to 60 MPa. The hydrostatic strain coefficient d(h), the hydrostatic voltage coefficient g(h) and figure of merit d(h).g(h) were determined using the static method. The pressure dependence of the hydrostatic coefficients was measured for several successive cycles. Experimental dependence of the charge on pressure and temperature was fitted by multi parameter function. The pressure and temperature dependencies of the hydrostatic d(h) and pyroelectric p(3) coefficients were determined. It was found that the hydrostatic strain coefficient d(h) and hydrostatic voltage coefficient g(h) decreased and pyroelectric coefficient p(3) increased with pressure at constant temperature.