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Lead-free BNBT-6 piezoelectric ceramic fibre/epoxy 1-3 composites for ultrasonic transducer applications

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Abstract

Barium-modified bismuth sodium titanate, 0.94 ×(Bi0.5Na0.5)TiO3-0.06BaTiO3 (BNBT-6), fine-scale piezoelectric fibres were fabricated using a viscous suspension spinning process (VSSP). The sintered BNBT-6 fibres with diameters of ∼300 μm were fabricated into 1-3 composites with fibre volume fraction vf of 0.2–0.5. Piezoelectric and dielectric properties of the 1-3 composites were measured. The electromechanical coupling coefficient kt of a vf=0.40 composite is 0.52. Properties of the VSSP fibres were calculated using the measured properties of the 1-3 composites. A vf=0.40 composite was thinned down to ∼213-μm thickness and constructed into an ultrasonic transducer. The pulse-echo response, bandwidth and insertion loss of the transducers were studied. The VSSP fibre composite transducer with vf=0.40 has a centre frequency of ∼7 MHz with a bandwidth of 88%. The good performance indicated that the BNBT-6/epoxy 1-3 fibre composite transducer has potential for medical imaging applications.

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Authors and Affiliations

  1. Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, P.R. China

    D.Y. Wang, K. Li & H.L.W. Chan

Authors
  1. D.Y. Wang
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  2. K. Li
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  3. H.L.W. Chan
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Correspondence to D.Y. Wang.

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PACS

77.84.Dy; 77.84.Lf; 43.38.+n

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Wang, D., Li, K. & Chan, H. Lead-free BNBT-6 piezoelectric ceramic fibre/epoxy 1-3 composites for ultrasonic transducer applications. Appl. Phys. A 80, 1531–1534 (2005). https://doi.org/10.1007/s00339-003-2390-3

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  • DOI: https://doi.org/10.1007/s00339-003-2390-3

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