Multidimensional synergy-induced high piezoelectricity and reliability KNN piezoceramics for high-frequency ultrasonic transducers

High-frequency ultrasonic transducers have been implemented as a powerful tool for modern medical diagnosis and therapy. Most current use piezoelectric ceramics electromechanical couplings, which will undergo periodic electro-acoustic transitions at high frequencies (≥20 MHz), thereby requiring reliability. This work presents structural engineering strategy to improve the piezoelectricity reliability of potassium sodium niobate (KNN)-based with potential high-frequency imaging transducers. The KNN-based exhibit fatigue-free behavior enhanced (d33 ∼550 ± 20 pC N−1), mechanisms are discussed in view multi-dimensions from macroscopy microscopy. Considering synergistic effect multi-phase coexistence, well-kept microstructure, flexible domain rotation, property-worsening cracks during fatigue restrained; furthermore, aggregation space charges is hindered, reducing pinned improving resistance. Based on high-performance piezoceramics, fabricated transducer has steady sensitivity an unchanged broad bandwidth (∼76%) room temperature 80°C. In addition, images tilapia eyeball scanned confirm capability We expect that novel approach achieving performance through promotes devices biomedical imaging.