title: Bismuth Titanate Fabricated by Spray-on Deposition and Microwave Sintering For High-Temperature Ultrasonic Transducers.
abstract: Thick films of ferroelectric bismuth titanate (Bi4Ti3O12) 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 d33 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 d33 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.
authors.forename: Clifford T
authors.initials: CT
authors.lastname: Searfass
authors.forename: C
authors.initials: C
authors.lastname: Pheil
authors.forename: K
authors.initials: K
authors.lastname: Sinding
authors.forename: B R
authors.initials: BR
authors.lastname: Tittmann
authors.forename: A
authors.initials: A
authors.lastname: Baba
authors.forename: D K
authors.initials: DK
authors.lastname: Agrawal