Bismuth Titanate Fabricated by Spray-on Deposition and Microwave Sintering For High-Temperature Ultrasonic Transducers

Thick films of ferroelectric bismuth titanate (Bi 4 Ti 3 O 12 ) have been fabricated by spray-on deposition in conjunction with microwave sintering for use as high-temperature ultrasonic transducers. The elastic modulus, density, permittivity, and conductivity of the films were characterized. Electr...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2016-01, Vol.63 (1), p.139-146
Main Authors: Searfass, Clifford T., Pheil, C., Sinding, K., Tittmann, B. R., Baba, A., Agrawal, D. K.
Format: Article
Language:English
Subjects:
Bismuth
Bismuth titanate
Density
Deposition
Electromagnetic heating
Ferroelectric materials
Field strength
Microwave sintering
Microwave theory and techniques
Spray-on deposition
Substrates
Thick films
Titanium compounds
Transducers
ultrasonic transducers
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Summary:Thick films of ferroelectric bismuth titanate (Bi 4 Ti 3 O 12 ) have been fabricated by spray-on deposition in conjunction with microwave sintering for use as high-temperature ultrasonic transducers. The elastic modulus, density, permittivity, and conductivity of the films were characterized. Electro-mechanical properties of the films were estimated with a commercial d 33 meter which gave 16 pC/N. This value is higher than typically reported for bulk bismuth titanate; however, these films withstand higher field strengths during poling which is correlated with higher d 33 values. Films were capable of operating at 650 °C for roughly 5 min before depoling and can operate at 600 °C for at least 7 days.
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2015.2501241