Impact of synthesis route on the microstructure and energy-storage properties of (Bi1/2K1/2)TiO3–SrTiO3 relaxor ferroelectric ceramics: Solid-state and hydrothermal approaches |
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| Affiliation: | 1. Laboratory for Computational Physics, Institute for Computational Science and Artificial Intelligence, Van Lang University, Ho Chi Minh City, VietNam;2. Faculty of Mechanical - Electrical and Computer Engineering, School of Technology, Van Lang University, Ho Chi Minh City, VietNam;3. Faculty of Engineering, Vietnamese-German University, Binh Duong, VietNam;4. International Training Institute for Materials Science, Hanoi University of Science and Technology, Ha Noi, VietNam;1. Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China;2. School of Mechanical Engineering, Guilin University of Aerospace Technology, Guilin 541004, China;3. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, Guilin 541004, China;1. College of Electronic Information and Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;2. College of Materials Science and Engineering, Liaocheng University, Liaocheng, China;3. College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China |
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| Abstract: | Bismuth potassium titanate (Bi1/2K1/2)TiO3-based relaxor ferroelectrics are promising materials for high-energy-density ceramic capacitors. Herein, we compare the microstructure and energy-storage properties of (Bi1/2K1/2)0.5Sr0.5TiO3 (BKST50) ceramics fabricated via two different routes: solid-state and hydrothermal reactions. A BKST50 fine powder composed of well-dispersed cubic nanoparticles was obtained via the hydrothermal reaction, whereas the conventional solid-state reaction resulted in the aggregation of primary particles. The grain size of the ceramics prepared from the hydrothermal powder could be controlled between 273 ± 24 and 936 ± 69 nm while maintaining a relative density of over 95% by simply varying the sintering temperature. On the other hand, ceramics prepared via the solid-state reaction could not be fully densified even at 1200 °C (the highest tested sintering temperature). The hydrothermally derived ceramics withstood higher electric field owing to dense and fine-grained microstructure, leading to a high recoverable energy-storage density of 2.25 J cm?3 at 240 kV cm?1. |
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| Keywords: | Relaxor ferroelectrics Hydrothermal reaction Energy-storage Sintering Nanoparticles |
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