Effect of particle size on the dielectric and piezoelectric properties of PbTiO/sub 3/-polymer composites

Piezoelectric composites were prepared by mixing 67-vol% modified PbTiO/sub 3/ with a polymer. Composites were cured at 80 degrees C for 10 h and poled with an electric field of 40 kV/cm for 1 h at 80 degrees C. The dielectric constant, piezoelectric d/sub 33/, and hydrostatic coefficient d/sub h/ were found to increase with increasing particle size and the hydrostatic g/sub h/ coefficient decreased with increasing particle size of PbTiO/sub 3/. The hydrostatic figure of merit, d/sub h/g/sub h/ was shown to be independent of particle size. Composites prepared with large particles were found to have lower breakdown strengths. The difference in properties with particle size indicates a probable change in connectivity due to variation of particle size and morphology.<
>