High Performance KNN-Based Single Crystal Thick Film for Ultrasound Application
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Using a novel lapping technology, the achievement of approximately 28 μm (K0.45Na0.55)0.96Li0.04NbO3 (abbreviated as KNLN) single crystal thick film with <001> orientation has been realized. This kind of thick film exhibited excellent electrical performance: a superior piezoelectric constant (~ 490 pm/V) and an outstanding electromechanical coupling coefficient (kt ~ 0.55). Based on the obtained KNLN single crystal thick film, a tiny side-looking 82 MHz ultrasound transducer with a bandwidth of 57.3% at − 6 dB has been successfully fabricated. Most importantly, 80 MHz intravascular ultrasound and photoacoustic images of the healthy rabbit aorta have been presented. All these promising results indicate that KNN-based single crystal thick film is a good environmental protection candidate for high frequency (~ 80 MHz) ultrasound applications.
KeywordsKNN-based single crystal Thick film Piezoelectric property Electromechanical coupling coefficient Ultrasound
This work was supported by the Natural Science Foundation of China (Grant No. 11774117, 11574096), the Natural Science Foundation Instrument Project of China (Grant No. 81727805), and the Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures (Nanjing University of Aeronautics and astronautics) (Grant No. MCMS-0317G01). We also thank the Analytical and Testing Center of Huazhong University of Science & Technology.
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