THE HYDROSTATIC PIEZOELECTRIC COEFFICIENTS OF PBTIO3 PVDF COMPOSITES WITH 0-3-CONNECTIVITY DETERMINED AT THE HIGH-PRESSURE RANGE/

The hydrostatic piezoelectric coefficients of piezoelectric composites with 0-3 connectivity were measured. Composites were made from lead t itanate PbTiO3 and PVDF polymers as thin circle samples using hot pres sing technique. The samples were pooling in electrical field at higher temperature. The hydrostatic strain coefficient db, the hydrostatic v oltage coefficient gh and figure of merit d(h.gh) were determined usin g the static D.C. technique inside the high pressure chamber. The pres sure range was 0 to 60 MPa. The samples were kept under an adjusting s tatic pressure from the hydraulic press. The charge produced by the sa mples was measured on a Keithley 6517 Electrometer. The coefficient db is a proportional amount of the measured charge. The dependences of h ydrostatic piezoelectric coefficients on high pressure are reported.