Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/11107
Title: High frequency 1-3 composite transducer fabricated using sol-gel derived lead-free BNBT fibers
Authors: Wang, DY
Li, K
Chan, HLW 
Keywords: 1-3 Composite
Ceramic fibers
Lead-free ceramics
Ultrasonic transducer
Issue Date: 2004
Publisher: Elsevier
Source: Sensors and actuators. A, Physical, 2004, v. 114, no. 1, p. 1-6 How to cite?
Journal: Sensors and actuators. A, Physical 
Abstract: Barium modified bismuth sodium titanate, 0.94(Bi0.5Na 0.5) TiO3-0.06BaTiO3 (BNBT-6), fine scale piezoelectric fibers were fabricated using a sol-gel technique. The diameter of the sintered BNBT-6 fibers is less than 100μm. The grain size of the ceramic fibers is 2-3μm. The fibers were then incorporated into an epoxy matrix to form 1-3 composites with about 0.30-0.40 volume fraction (vf) of BNBT-6 ceramics. After poling, piezoelectric and dielectric properties of the 1-3 composites were measured using an impedance analyzer HP4294A. With ∼0.30 ceramic fiber volume fraction, the electromechanical coupling coefficient kt is 0.71 for the sol-gel fiber/epoxy composite. A v f=0.30 composite was subsequently thinned down to 143μm thickness and constructed into an ultrasonic transducer. The pulse-echo response, bandwidth (BW), and insertion loss (IL) of the transducers were studied. This sol-gel fiber composite transducer can be operated at a higher frequency of 14.30MHz with a bandwidth of 80%. The good transducer performance indicated that the BNBT-6 fiber/epoxy 1-3 composite has potential in medical imaging applications.
URI: http://hdl.handle.net/10397/11107
ISSN: 0924-4247
EISSN: 1873-3069
DOI: 10.1016/j.sna.2004.02.024
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