Energy-storage properties of Bi0.5Na0.5TiO3-BaTiO3-KNbO3 ceramics fabricated by wet-chemical method |
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| Affiliation: | 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, China;2. Materials Research Institute, Pennsylvania State University, University Park, PA, 16802, USA;1. Department of Microelectronic Science and Engineering, Ningbo University, 315211 Ningbo, China;2. State Key Base of Novel Functional Materials & its Preparation Science, Institute of Materials Science & Engineering, Ningbo University, Ningbo 315211, China;1. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, PR China;2. Guangxi Experiment Center of Information Science, Guilin 541004, PR China;1. School of Materials Science and Engineering, Xi''an University of Science and Technology, Xi''an 710054, China;2. School of Electro-Mechanical Engineering, Xidian University, Xi''an 710071, China;3. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China |
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| Abstract: | 0.93Bi0.5Na0.5TiO3-0.07BaTiO3 (BNTBT) and KNbO3 (KN) powders with average particle size of ∼50 nm and ∼300 nm were synthesized by sol-gel method and hydrothermal method, respectively. Then, (1 − x)(BNTBT)-xKN (BNTBT-KN, x = 0, 0.01, 0.03, 0.05, 0.07) ceramic samples were prepared using these two powder precursors. The structure, dielectric and energy-storage properties of BNTBT-KN ceramics were comprehensively investigated. All the ceramic samples were in single perovskite structure, indicating that KN can completely dissolve into BNTBT within the studied composition range. BNTBT-KN ceramics exhibited a high dielectric constant at room temperature, being in the order of 1430–1550. Ferroelectric hysteresis loops at room temperature became more slim with the increase of KN content, which largely improved energy-storage density and efficiency. For the composition of x = 0.05, the maximum recoverable energy-storage density reached 1.72 J/cm3 under 16.8 kV/mm, which is superior to linear dielectrics and even some Pb-based systems. All these results demonstrate that 0.95BNTBT-0.05KN fabricated by wet-chemical method is a promising lead-free dielectric material for energy-storage capacitors. |
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| Keywords: | Energy storage Sol-gel Hydrothermal method |
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