Xi'an Jiaotong University solves the basic difficulties of piezoelectric single crystal materials for high frequency and high precision ultrasonic transducers

The reporter learned from Xi'an Jiaotong University that the team of Li Fei and Professor Xu Zhuo of the school's Department of Telecommunications and their collaborators have developed a samarium-doped lead niobate-lead titanate piezoelectric single crystal, which has significantly improved the use of medical ultrasonic transduction The piezoelectric material performance of the device has laid a new piezoelectric single crystal material foundation for high frequency medical ultrasound probes and high precision and large displacement piezoelectric actuators. His research results will be published in Science.

Since the discovery of the relaxation ferroelectric single crystal in 1997, the performance of piezoelectric materials and the imaging resolution of medical ultrasound have been greatly improved. However, as people continue to increase the accuracy requirements of medical ultrasound systems, how to further improve the piezoelectric and dielectric properties of relaxation ferroelectric single crystals has become an important scientific issue that has been widely concerned by scientists at home and abroad for more than 20 years. In recent years, the team of Professor Xu Zhuo and Professor Li Fei from the Key Laboratory of Electronic Ceramics and Devices of the Ministry of Education and the International Dielectric Research Center of Xi’an Jiaotong University have conducted a lot of research on the origin and performance optimization of high-voltage electrical properties of relaxation ferroelectric single crystals jobs. In 2016, the research team revealed the mechanism of the high-voltage electrical effect of relaxed ferroelectric single crystals on a mesoscopic scale. In 2018, a theoretical method was proposed to further enhance the piezoelectric performance of ferroelectric materials by enhancing the disorder of the local structure, and it was experimentally verified in the rare earth element samarium doped lead niobate-lead titanate ceramic material.

On this basis, the research team of Xi'an Jiaotong University cooperated with Pennsylvania State University in the United States, Wollongong University in Australia, and North Carolina State University in the United States to design and grow a samarium-doped lead niobate-lead titanate piezoelectric single crystal, which was successful Organically combining the causes of the three types of high-voltage electrical effects, "enhanced local structural disorder", "quasi-homogeneous phase boundary" and "engineered domain structure", greatly improves the piezoelectricity and dielectric of the relaxed ferroelectric single crystal Performance, the piezoelectric coefficient is up to 4000 pC / N (picoulon per Newton) or more, and the dielectric constant is more than 12000, which is compared with the performance of the same component lead niobate-lead titanate piezoelectric single crystal without samarium Increased by about one time; at the same time, the use of samarium element in the crystal growth process of the segregation characteristics, optimized the uniformity of the performance of single crystal rods, laid a new piezoelectric for high-frequency medical ultrasound probes and high-precision and large displacement piezoelectric actuators Material foundation. (Reporter Shi Junbin)

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