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Title: Ultrasonic transducer fabricated using lead-free BFO-BTO+Mn piezoelectric 1-3 composite
Authors: Chen, Y
Mei, K
Wong, CM
Lin, DM
Chan, HLW 
Dai, JY 
Keywords: Lead-free ceramic
1-3 composite
Ultrasonic transducer
Issue Date: 2015
Publisher: Molecular Diversity Preservation International (MDPI)
Source: Actuators, 2015, v. 4, no. 2, p. 127-134 How to cite?
Journal: Actuators 
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.
ISSN: 2076-0825
DOI: 10.3390/act4020127
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