Ferroelectric materials have rich external field-induced phase transition behavior and complex coupling effects, and have important applications in the field of energy storage and conversion. At present, the main material used in engineering is the Pb (Zr, Ti) O3 (PZT) system. Exploring and developing new material systems, especially lead-free material systems, are the current research hotspots and development trends in the field of ferroelectric materials. (Bi0.5Na0.5) TiO3 (BNT) -based ferroelectric ceramics have attracted much attention due to their excellent ferroelectric properties, relaxation characteristics, and complex micro-domain structure. They are considered to be an important system that is expected to replace PZT-based ferroelectric ceramics one. However, the shortcomings of pure BNT ferroelectric ceramics, such as large coercive field, low resistivity and low depolarization temperature (Td), limit its application. How to enhance the comprehensive performance of BNT ceramics through composition and microstructure design and reveal related physical mechanisms is an important topic in this field.

Recently, the research team led by Dong Xianlin and Wang Genshui, researchers at the Information Functional Materials and Devices Research Center of the Shanghai Institute of Ceramics, Chinese Academy of Sciences, used BNT ceramics as the matrix to achieve the BNT ferroelectric ceramic system impact resistance and charge density And the performance of energy storage density and energy storage efficiency has been significantly improved, and the physical mechanism of performance enhancement has been revealed. The team used the BNT-BA material system as the matrix, and the solid solution NaNbO3 effectively regulated the phase structure and microstructure of the ceramics to obtain Pr (41μC / cm2), low dielectric loss, high resistivity and high residual polarization strength. High Td (175oC) ceramic component. The discharge behavior and physical mechanism of BNT-based ferroelectric ceramics under shock wave were studied by isostatic pressure and shock wave loading experimental system. The charge density released under 8.2GPa shock pressure was as high as 38 mC / cm2, which was higher than that of PZT95 / 5 ferroelectric ceramics. ~ 20%, impact resistance and charge density are the maximum values ​​reported so far. Related results were published in Applied Physics Letters, 113, 082901 (2018), Journal of the American Ceramic Society, 101, 4044-4052 (2018), Journal of Applied Physics, 123, 036301 (2018) and Journal of the American Ceramic Society, 102, 2569-2577 (2019). The first author of the paper is Peng Ping, the corresponding author is Dong Xianlin and associate researcher Nie Hengchang.

The team also designed a new BNT-based dielectric energy storage ceramic material through relaxation control strategies, which increased the energy storage density and energy storage efficiency to 3.08 J / cm3 and 81.4%, respectively. The design idea is to introduce Sr0.85Bi0.1? 0.1TiO3 (representing A-site vacancies) and NaNbO3 in the BNT matrix, and form a local random field through the introduction of A-site vacancies and ion substitution to create a random field and break The long-range ordered structure of dipoles in the BNT matrix forms weakly coupled polar nano-domains, which is conducive to obtaining higher energy storage density (Wrec) and energy storage efficiency (h). At the same time, it is found that under the test conditions of RT ~ 100 ℃ and 1Hz ~ 100Hz, its energy storage characteristics also have excellent stability. This material is expected to become a candidate material for dielectric energy storage capacitors. Related work was published in Journal of Materials Chemistry C, 7, 6222-6230 (2019) and Rsc Advances, 9, 21355-21362 (2019). The first author of the thesis is Wu Yichen, a graduate student, and the corresponding author is Wang Genshui.

The team collaborated with the application unit to obtain the highest reported power output density in the BNT-based ferroelectric ceramics using the shock wave loading experiment, and revealed its phase change mechanism under high pressure. Related results were published in Physic Review Materials 3, 035401 (2019). The first author of the paper is Gao Zhipeng, associate researcher at the Institute of Fluid Physics, Chinese Academy of Engineering Physics, and the corresponding author is Wang Genshui.

The above research results show that BNT-based ferroelectric ceramics have potential application prospects in ferroelectric high-power pulse technology and dielectric energy storage capacitors. Related research was supported by the National Natural Science Foundation of China, Shanghai Natural Science Foundation, Youth Innovation Promotion Association of Chinese Academy of Sciences, and the Dean Fund of China Academy of Engineering Physics.

Discharge characteristics and response behavior of BNT-based ferroelectric ceramics under shock wave loading

BNT-based ceramics controlled by relaxation strategies and their relaxation and energy storage characteristics

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