IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control · 2015 · 27 citations · 26 references
Natural SciencesMaterials EngineeringMaterials ScienceCeramic MaterialsMaterials CharacterizationThin FilmsDielectricsFerroelectric CeramicsFerroelectric MaterialsThin Film Mechanical PropertiesTransducer TechnologyUltrasonicsBarium TitanateElastic ModulusFerroelectric PropertiesFerroelectric Thin FilmsMicrowave SinteringThin Film FerroelectricsTransducersUltrasonic Transducers
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.
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