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PMN-PT Single Crystal for Endoscopic Ultrasound 2D Array Application
Yuhang Zhu,Huageng Liang,Benpeng Zhu,Dan Zhou,Xiaofei Yang 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.2
Based on lead magnesium niobate-lead titanate single crystal, a 24 × 24row-column addressing endoscopic two-dimensional array has beensuccessfully fabricated using novel flanged electrodes and “semi-kerf”technologies. Each row/column array element was measured to have anelectromechanical coupling coefficient of 0.81, a center frequency of5MHz, and a fractional bandwidth of approximately 88% at −6 dB. Ofparticular significance was that the lead magnesium niobate-lead titanateelement exhibits much higher sensitivity compared with lead zirconatetitanate-based 2D arrays with similar operational frequency and elementarea. According to the Field II simulated results, although the obtainedbeamwidth at −6 dB was a little inferior to that of the fully sampled 24 × 24two-dimensional array, it is believed that the beamwidth can be improved byappropriately increasing the element number. These results demonstratedthat the lead magnesium niobate-lead titanate single-crystal 2D array is apromising candidate for real-time three-dimensional endoscopic ultrasoundimaging.
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High performance KNN-based single crystal thick film for ultrasound application
Tao Zhang,Jun Ou-Yang,Xiaofei Yang,Wei Wei,Benpeng Zhu 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.1
Using a novel lapping technology, the achievement of approximately 28 μm (K 0.45 Na 0.55 ) 0.96 Li 0.04 NbO 3 (abbreviated asKNLN) single crystal thick fi lm with <001> orientation has been realized. This kind of thick fi lm exhibited excellent electricalperformance: a superior piezoelectric constant (~ 490 pm/V) and an outstanding electromechanical coupling coeffi cient(k t ~ 0.55). Based on the obtained KNLN single crystal thick fi lm, a tiny side-looking 82 MHz ultrasound transducer witha bandwidth of 57.3% at − 6 dB has been successfully fabricated. Most importantly, 80 MHz intravascular ultrasound andphotoacoustic images of the healthy rabbit aorta have been presented. All these promising results indicate that KNN-basedsingle crystal thick fi lm is a good environmental protection candidate for high frequency (~ 80 MHz) ultrasound applications.
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