title: Dielectric and Piezoelectric Properties of PZT Composite Thick Films with Variable Solution to Powder Ratios.
abstract: The use of PZT films in sliver-mode high-frequency ultrasonic transducers applications requires thick, dense, and crack-free films with excellent piezoelectric and dielectric properties. In this work, PZT composite solutions were used to deposit PZT films >10 μm in thickness. It was found that the functional properties depend strongly on the mass ratio of PZT sol-gel solution to PZT powder in the composite solution. Both the remanent polarization, P(r), and transverse piezoelectric coefficient, e(31,) (f), increase with increasing proportion of the sol-gel solution in the precursor. Films prepared using a solution-to-powder mass ratio of 0.5 have a remanent polarization of 8 μC/cm(2), a dielectric constant of 450 (at 1 kHz), and e(31,) (f) = -2.8 C/m(2). Increasing the solution-to-powder mass ratio to 6, the films were found to have remanent polarizations as large as 37 μC/cm(2), a dielectric constant of 1250 (at 1 kHz) and e(31,) (f) = -5.8 C/m(2).
authors.affiliation: Department of Biomedical Engineering, NIH Transducer Resource Center University of Southern California, Los Angeles, California 90089.
authors.forename: Dawei
authors.initials: D
authors.lastname: Wu
authors.forename: Qifa
authors.initials: Q
authors.lastname: Zhou
authors.forename: Koping Kirk
authors.initials: KK
authors.lastname: Shung
authors.forename: Srowthi N
authors.initials: SN
authors.lastname: Bharadwaja
authors.forename: Dongshe
authors.initials: D
authors.lastname: Zhang
authors.forename: Haixing
authors.initials: H
authors.lastname: Zheng