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

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...

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Bibliographic Details
Published in:Actuators 2015-06, Vol.4 (2), p.127-134
Main Authors: Chen, Yan, Mei, Kai, Wong, Chi-Man, Lin, Dunmin, Chan, Helen Lai Wa, Dai, Jiyan
Format: Article
Language:English
Subjects:
1-3 composite
Acoustic impedance
Ceramics
Dubnium
Lead free
lead-free ceramic
Piezoelectric ceramics
Transducers
Ultrasonic testing
ultrasonic transducer
Volume fraction
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Summary: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
2076-0825
DOI:10.3390/act4020127