Premium
Lead–Zirconate–Titanate Thick Films by Electrophoretic Deposition for High‐Frequency Ultrasound Transducers
Author(s) -
Kuscer Danjela,
Levassort Franck,
Lethiecq Marc,
Abellard AndrePierre,
Kosec Marija
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04911.x
Subject(s) - materials science , lead zirconate titanate , electrophoretic deposition , composite material , piezoelectricity , dielectric , composite number , porosity , calcination , zirconate , deposition (geology) , fabrication , ferroelectricity , ultrasonic sensor , substrate (aquarium) , phase (matter) , titanate , ceramic , optoelectronics , acoustics , alternative medicine , coating , chemistry , oceanography , pathology , biology , paleontology , biochemistry , catalysis , medicine , physics , organic chemistry , sediment , geology
Lead–zirconate–titanate ( PZT ) thick films for high‐frequency ultrasound applications were fabricated using an electrophoretic deposition ( EPD ) process. The PZT powder was synthesized from constituent oxides at close‐to‐room temperature by mechanochemical activation followed by calcination at 700°C. Homogeneous PZT thick films with a thickness of ~30 μm and a density of ~80% were produced from ethanol‐based colloidal suspensions containing PZT and PbO particles that were deposited using a constant‐current mode on a platinized alumina substrate and were sintered in the presence of a liquid phase at temperatures compatible with thick‐film technology. The dielectric, mechanical, and piezoelectric parameters of the PZT thick films with a porosity of ~20% were measured and a thickness‐coupling factor of 48% was obtained. Considering that a PZT thick film is a composite structure consisting of PZT and pores, there are several methods that can be applied to calculate the effective parameters where the composite is considered as a piezoelectric homogeneous material. For this study, a matrix method based on a generalization of 2‐2 connectivity was used to deduce the parameters of a completely dense configuration. Our results confirmed that the EPD process is suitable for the fabrication of efficient, high‐frequency transducers operating at frequencies above 40 MHz.