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弛豫铁电单晶 PMNT 具有优异的压电性能,它可以替代传统的压电陶瓷,在声呐探测、超声成像、高应变驱动器等方面得到广泛的应用。我们已经成功地生长出了尺寸为40×80mm 的 PMNT 单晶,其主要性能为,压电系数d_(33)>3000pC/N,介电常数ε～5000,损耗 tanδ<0.9%,纵向长度伸缩机电耦合 k_(33)～94%,厚度伸缩机电耦合 kt～62%。我们成功地制备出了在电声成像系统中的 PMNT 单晶压电换能器,使探测器的电声信号幅度有显著提高,充分显示了新型压电单晶在电声换能技术中具有巨大的应用前景。
The relaxation ferroelectric single crystal PMNT has excellent piezoelectric properties, which can replace the traditional piezoelectric ceramics and is widely used in sonar detection, ultrasonic imaging and high strain drive. We have succeeded in growing PMNT single crystal of size 40 × 80mm. The main properties are: piezoelectric coefficient d33 (33)> 3000pC / N, dielectric constant ε5000, loss tanδ <0.9%, longitudinal length expansion and contraction Electromechanical coupling k_ (33) ~ 94%, the thickness of the mechanical and electrical coupling kt ~ 62%. We have succeeded in preparing the electro-acoustic imaging system PMNT single crystal piezoelectric transducer, the detector electro-acoustic signal amplitude has significantly improved, fully demonstrated the new piezoelectric single crystal in the electro-acoustic transduction technology has Huge application prospects.