【摘 要】
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Background, Motivation and Objective High intensity focused ultrasound (HIFU) transducers have been widely utilized for noninvasive therapeutic procedures. Piezoelectric ceramics with high depolarizat
【机 构】
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Materials Science and Engineering, Rutgers University, Piscataway, NJ, USA
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Background, Motivation and Objective High intensity focused ultrasound (HIFU) transducers have been widely utilized for noninvasive therapeutic procedures. Piezoelectric ceramics with high depolarizationtemperature, high mechanical quality factor, low dielectric loss, and relatively high coercive field are required for high power devices such as HIFU transducers. Until now,only lead-based piezoelectric compositions such a PZT4 have been employed as active element of HIFU transducers. Lead is a toxic element which can cause severe healthissues for human beings. As a result, researchers have been motivated to develop and characterize hard lead-free piezoceramics for high power applications. It is reported thatBNT-based ceramics with rhombohedral structure exhibit promising performance under high drive conditions. In this research, firstly, the electrocmechanical and high powerproperties of hard BNT-based ceramics were studied and then HIFU transducers with different center frequencies of 1, 5, and 8 MHz were fabricated and characterized.
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