Effect of K2O content on breakdown strength and energy-storage density in K2O-BaO-Nb2O5-SiO2 glass-ceramics |
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| Affiliation: | 1. Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Functional Materials Research Laboratory, School of Materials Science & Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China;2. School of Physics and Electronic Science, Guizhou Normal University, Guiyang 550001, China;1. Faculty of Materials Science & Chemical Engineering, Ningbo University, Ningbo 315211, China;2. Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China;3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;1. Faculty of Materials Science & Chemical Engineering, and Department of Physics, Ningbo University, Ningbo 315211, China;2. Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China;3. Zhejiang Key Lab on Magnetic Materials, China Jiliang University, Hangzhou 310018, China;1. Faculty of Materials Science & Chemical Engineering, Ningbo University, Ningbo 315211, China;2. College of Materials Science & Engineering, China Jiliang University, Hangzhou 310018, China;3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;1. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, Shanxi, 030024, China;2. School of Mining Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, China |
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| Abstract: | Phase evolution, dielectric properties, breakdown strength, and energy-storage performance were studied by varying K2O content in K2O-BaO-Nb2O5-SiO2 glass-ceramics. It was found that dielectric loss with the increase of K2O content increases owing to the un-crystallized K2O into the glass network, while dielectric breakdown strength firstly increases and then decreases due to the competition between two physical mechanisms, i.e., interfacial polarization and bridging-oxygen bond broken by the non-bridging oxygen ions. With the increase of K2O content, energy-storage density firstly increased up to 12.06±0.69 J/cm3 with a high breakdown strength of 1973 kV/cm, and then decreased. Also, the discharged efficiency is obtained as a high value of 92% from P-E hysteresis loops. |
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| Keywords: | Glass-ceramic Energy storage density Breakdown strength Glass network |
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