Poling of Coprecipitated Lead Titanate‐Epoxy 0–3 Piezoelectric Composites

Abstract

The 0–3 piezoelectric composites were prepared using a dielectric gel with 70 vol% of coprecipitated PbTiO 3 powders with sizes of 12 to 1100 nm. Composites were cured at 80°C for 10 h and poled with E = 0 to 100 kV /cm for 0 to 15 min at 85°C. X‐ray diffraction patterns taken on the surface of the composites before and after poling indicated that saturation poling was nearly achieved at 80 kV /cm. d̄ 33 was strongly dependent upon the particle size. Composites of fine PbTiO 3 powders, smaller than 200 nm, needed a much longer poling time to saturate than large particles probably because of the rotation of the single‐domain crystallites during poling.