PZT-based thick films and the development of a piezoelectric pressure sensor

A study was carried out on the relationship between the composition, poling condition and piezoelectric properties of thick-film layers. Pastes based on lead-titatnate zirconate (PZT) powders, with either Pbo or a lead-alumina -silicate glass frit as binder, were prepared . Microstructure, electrical and mechanical properties were analysed. processing and polig conditions modify these properties; then a wide latitude of opportunities is offered in the choice of ferroelectric/piezoelectric characteristics of the layers used as sensing elements for sensors. A pressure sensor was realised where a circular diaphragm of alumina supports two piezoelectric layers obtained by screen printing and firing a PZT/PbO-based ferroelectric paste. The design and performance characteristics are described