Lead-free BNT composite film for high-frequency broadband ultrasonic transducer applications

Xingwei Yan, Hongfen Ji, Kwok Ho Lam, Ruimin Chen, Fan Zheng, Wei Ren, Qifa Zhou, K. Shung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

31 Citations (Scopus)


A lead-free Bi0.5Na0.5TiO3(BNT) piezoelectric composite thick film with a thickness of ̃11 μm has been fabricated using a modified sol-gel method. Dielectric constant, remnant polarization, and coercive field of the BNT composite film were found to be 1018, 22.6 μC/cm2, and 76.1 kV/cm, respectively. The film was used to fabricate a high-frequency needle transducer and the performance of the transducer was measured. The transducer without a matching layer exhibits a center frequency of 98 MHz and a -6-dB bandwidth of 86%. A wire phantom image acquired using the transducer shows an axial resolution of 15 ¿m and lateral resolution of 68 μm, respectively. Results from this study suggest that the BNT composite film is a promising lead-free piezoelectric material for high-frequency broadband ultrasonic transducer applications.
Original languageEnglish
Article number6552404
Pages (from-to)1533-1537
Number of pages5
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Issue number7
Publication statusPublished - 26 Jul 2013
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering


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