title: High-Frequency Ultrasonic Imaging with Lead-free (Na,K)(Nb,Ta)O3Single Crystal.
abstract: Lead-free (Na,K)(Nb,Ta)O3(KNNT) piezoelectric single crystal has been successfully grown using the top-seeded solution growth technique. The electromechanical coupling factors are very high ( k33= 0.827, kt= 0.646), and the dielectric loss tangent is as low as 0.004. Acoustic impedance was calculated to be 26.5 MRayl. From the single crystal, a single element transducer was fabricated. The transducer achieved a 57.6% -6 dB bandwidth and 32.3 µm axial resolution at the center frequency of 45.4 MHz, which can identify the cornea of porcine eyeball with high resolution. Comparison between KNNT single crystal and lead-based single crystal was discussed. The results suggest that this single crystal transducer is an excellent candidate to replace lead-containing transducer for high-frequency ultrasonic imaging applications.
authors.affiliation: 1 Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA.|2 School of Materials Science and Engineering, Central South University, Changsha, China.
authors.forename: Zeyu
authors.initials: Z
authors.lastname: Chen
authors.affiliation: 3 Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin, China.
authors.forename: Limei
authors.initials: L
authors.lastname: Zheng
authors.affiliation: 4 Department of Mathematics and Materials Research Institute, The Pennsylvania State University, University Park, PA, USA.
authors.forename: Wenwu
authors.initials: W
authors.lastname: Cao
authors.affiliation: 1 Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA.|5 Department of Material Science, Sichuan University, Chengdu, China.
authors.forename: Xiaoyang
authors.initials: X
authors.lastname: Chen
authors.affiliation: 1 Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA.
authors.forename: Ruimin
authors.initials: R
authors.lastname: Chen
authors.affiliation: 1 Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA.
authors.forename: Runze
authors.initials: R
authors.lastname: Li
authors.affiliation: 1 Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA.
authors.forename: Kirk
authors.initials: K
authors.lastname: Shung
authors.affiliation: 1 Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA.|6 Roski Eye Institute, University of Southern California, Los Angeles, CA, USA.
authors.forename: Qifa
authors.initials: Q
authors.lastname: Zhou
mesh_terms: D000818:Animals; D004867:Equipment Design; D005123:Eye / Q000000981:diagnostic imaging*; D007477:Ions; D023421:Models, Animal; D009556:Niobium; D010100:Oxygen; D011188:Potassium; D012964:Sodium; D013552:Swine; D013635:Tantalum; D014159:Transducers; D014465:Ultrasonics; D014463:Ultrasonography / Q000295:instrumentation* / Q000379:methods*
chemical_list: D007477:Ions; D009556:Niobium; D013635:Tantalum; D012964:Sodium; D011188:Potassium; D010100:Oxygen
keywords: lead-free materials; piezoelectric single crystal; ultrasonic imaging; ultrasonic transducer