Ultrasonic transducer fabricated using lead-free BFO-BTO+Mn piezoelectric 1-3 composite

Y. Chen, K. Mei, C.M. Wong, D.M. Lin, H.L.W. Chan, Jiyan Dai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Mn-doped 0.7BiFeO3-0.3BaTiO3 (BFO-0.3BTO+Mn 1% mol) lead-free piezoelectric ceramic were fabricated by traditional solid state reaction. The phase structure, microstructure, and ferroelectric properties were investigated. Additionally, lead-free 1–3 composites with 60% volume fraction of BFO-BTO+Mn ceramic were fabricated for ultrasonic transducer applications by a conventional dice-and-fill method. The BFO-BTO+Mn 1-3 composite has a higher electromechanical coupling coefficient (kt = 46.4%) and lower acoustic impedance (Za ~ 18 MRayls) compared with that of the ceramic. Based on this, lead-free piezoelectric ceramic composite, single element ultrasonic transducer with a center frequency of 2.54 MHz has been fabricated and characterized. The single element transducer exhibits good performance with a broad bandwidth of 53%. The insertion loss of the transducer was about 33.5 dB.
Original languageEnglish
Pages (from-to)127-134
Number of pages8
JournalActuators
Volume4
Issue number2
DOIs
Publication statusPublished - 2015

Keywords

  • Lead-free ceramic
  • 1-3 composite
  • Ultrasonic transducer

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Control and Optimization

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