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Actuators 2015, 4(2), 127-134; doi:10.3390/act4020127

Ultrasonic Transducer Fabricated Using Lead-Free BFO-BTO+Mn Piezoelectric 1-3 Composite

The Hong Kong Polytechnic University, Shenzhen Research Institute, Shenzhen 518057, China
Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China
College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Delbert Tesar
Received: 1 April 2015 / Revised: 12 May 2015 / Accepted: 27 May 2015 / Published: 29 May 2015
(This article belongs to the Special Issue Feature Papers)
View Full-Text   |   Download PDF [431 KB, uploaded 29 May 2015]   |  


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. View Full-Text
Keywords: lead-free ceramic; 1-3 composite; ultrasonic transducer lead-free ceramic; 1-3 composite; ultrasonic transducer

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Chen, Y.; Mei, K.; Wong, C.-M.; Lin, D.; Chan, H.L.W.; Dai, J. Ultrasonic Transducer Fabricated Using Lead-Free BFO-BTO+Mn Piezoelectric 1-3 Composite. Actuators 2015, 4, 127-134.

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