title: NOVEL LEAD ZIRCONATE TITANATE COMPOSITE VIA FREEZING TECHNOLOGY FOR HIGH FREQUENCY TRANSDUCER APPLICATIONS.
abstract: Novel PZT-5A ceramic-polymer composite was prepared via freezing technology. This composite exhibited good dielectric and ferroelectric behaviors. At 1 kHz, the dielectric constant and the dielectric loss were 546 and 0.046, respectively, while the remnant polarization was 13.0 μC/cm(2) at room temperature. The electromechanical coupling coefficient (k(t)) of PZT-5A composite was measured to be 0.54, which is similar to that of PZT piezoelectric ceramic. The piezoelectric coefficient (d(33)) of PZT-5A composite was determined to be ~250 pC/N. Using this composite, a 58MHz single element transducer with the bandwidth of 70% at -6dB was built, and the insertion loss was tested to be -29dB around the central frequency.
authors.affiliation: NIH Transducer Resource Center and Department of Biomedical Engineering University of Southern California Los Angeles, California 90089-1111, USA.
authors.forename: B P
authors.initials: BP
authors.lastname: Zhu
authors.forename: Q F
authors.initials: QF
authors.lastname: Zhou
authors.forename: C H
authors.initials: CH
authors.lastname: Hu
authors.forename: K K
authors.initials: KK
authors.lastname: Shung
authors.forename: E P
authors.initials: EP
authors.lastname: Gorzkowski
authors.forename: M J
authors.initials: MJ
authors.lastname: Pan