Journal
ACTUATORS
Volume 4, Issue 2, Pages 127-134Publisher
MDPI
DOI: 10.3390/act4020127
Keywords
lead-free ceramic; 1-3 composite; ultrasonic transducer
Funding
- National key Basic Research Program of China (973 Program) [2013CB632900]
- Hong Kong Polytechnic University Strategic Importance Plan [1-ZVCG 1-ZV9B]
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Mn-doped 0.7BiFeO(3)-0.3BaTiO(3) (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 (k(t) = 46.4%) and lower acoustic impedance (Z(a) similar to 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.
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