Multifunctional Properties and Device Applications of the Relaxor Ferroelectric Single Crystals

Abstract

Abstract: The relaxor ferroelectric single crystals, such as Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃ (PMN-PT or PMNT), exhibit excellent piezoelectric performances, which are much higher than the conventional lead zirconate titanate Pb(Zr_xTi_1-x)O₃ (PZT) ceramics. The ultrahigh piezoelectric performances of the PMN-PT relaxor ferroelectric single crystals induce the research upsurge of the next generation of piezoelectric devices such as ultrasonic transducers. Our research team was the first time to use the Bridgman method to grow the large size and high quality PMN-PT relaxor ferroelectric single crystals (d₃₃~2 000 pC/N, k₃₃~92%) in the world. The growth, hierarchical structure and properties of the PMN-PT relaxor ferroelectric single crystals were systematically and deeply studied in our research team in the past 20 years. Different from the traditional perovskite ferroelectric materials, the PMN-PT relaxor ferroelectric single crystals have hierarchical microstructures, including monoclinic phase structure (M_A, M_B, M_C), domain configuration, nano-regions (PNRs), polarization rotation, resulting in the related research on the origin of ferroelectric materials with high piezoelectricity and the development of the fundamental theory on the ferroelectric physics. It was also found that the PMN-PT crystals exhibit outstanding pyroelectric properties, electro-optic (EO) properties and super high magnetoelectric coupling properties in the magnetoelectric composites composed with the magnetostrictive materials. Based on this, our team is also striving to promote the applications of relaxor ferroelectric single crystals on medical ultrasonic transducers, pyroelectric infrared (PIR) detectors, EO devices, magnetoelectric weak magnetic sensors and other devices. The research results of multifunctional properties and device application of the relaxor ferroelectric single crystals in our team about 20 years are summarized in this paper.

Key words: relaxor ferroelectric single crystal, PMN-PT, device application, ultrasonic transducer, pyroelectric infrared detector, electro-optic device, weak magnetic sensor

CLC Number:

O734

LUO Haosu, JIAO Jie, CHEN Rui, ZHU Rongfeng, ZHANG Zhang, XU Jialin, ZHAO Jing, WANG Xi'an, LIN Di, CHEN Jianwei, DI Wenning, LU Li, ZHU Lili. Multifunctional Properties and Device Applications of the Relaxor Ferroelectric Single Crystals[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(5): 783-802.

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