title: Single crystal PMN-0.33PT/epoxy 1-3 composites for ultrasonic transducer applications.
abstract: Lead magnesium niobate-lead titanate 0.67Pb (Mg(1/3)Nb(2/3))O3-0.33PbTiO3 (PMN-0.33PT, abbreviated as PMN-PT) single crystals were used to fabricate PMN-PT/epoxy 1-3 composites with different volume fractions of PMN-PT ranging from 0.4 to 0.8. The electromechanical properties of the 1-3 composites were determined by the resonance technique. Theoretical modeling of the 1-3 composites matched quite well with the measured material properties. It was demonstrated that the thickness electromechanical coupling coefficients of the composites could reach as high as 0.8. A 2.4 MHz plane ultrasonic transducer was fabricated using a PMN-PT/epoxy 1-3 composite with 0.37 volume fraction of PMN-PT. It shows a -6 dB bandwidth of approximately 61% and an insertion loss of -14 dB.
authors.affiliation: Department of Applied Physics and Centre for Smart Materials, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, China. apahlcha@plyu.edu.hk
authors.forename: Kei C
authors.initials: KC
authors.lastname: Cheng
authors.forename: Helen L W
authors.initials: HL
authors.lastname: Chan
authors.forename: Chung L
authors.initials: CL
authors.lastname: Choy
authors.forename: Qingrui
authors.initials: Q
authors.lastname: Yin
authors.forename: Hasou
authors.initials: H
authors.lastname: Luo
authors.forename: Zhiwen
authors.initials: Z
authors.lastname: Yin