High power piezoelectric characteristics of KNbO3 thick films by hydrothermal method

摘要

Very high intensity and high frequency ultrasonic transducer using hydrothermal KNbO thick film was developed. The vibration velocity of surface of KNbO thick film was measured with thickness vibration mode. The amplitude of vibration velocity was 2.5m/s or over. And the radiation sound-pressure from the prototype ultrasonic transducer was measured at resonance frequency in degassed water. The radiation ultrasound was 4MPa or over.