Intermediate-temperature conductivity of B-site doped Na0.5Bi0.5TiO3-based lead-free ferroelectric ceramics |
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| Affiliation: | 1. College of Materials Science and Engineering, State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China;2. Research Institute of Huazhong University of Science and Technology in Shenzhen, Shenzhen 518057, China;3. Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, CAS, Shanghai 201204, PR China;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;2. National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;1. School of Materials Science and Engineering, University of Jinan, Jinan 250022, China;2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People?s Republic of China;2. National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, People?s Republic of China;3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, People?s Republic of China;1. Department of Applied Physics, Guru Jambheshwar University of Science & Technology, Hisar, 125001, Haryana, India;2. Department of Physics, MKJK College, Rohtak, 124001, Haryana, India;3. Matu Ram Institute of Engineering and Management, Rohtak, 124001, Haryana, India |
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| Abstract: | Na0.5Bi0.5TiO3 (NBT) based oxide-ion conductor ceramics have great potential applications in intermediate-temperature solid oxide fuel cells (SOFCs) and oxygen sensors. Na0.5Bi0.49Ti1?xMgxO3?δ ceramics with x=0, 0.01, 0.02, 0.03, 0.05 and 0.08 were prepared by conventional solid-state reaction. XRD measurement and SEM analysis revealed the formation of pure perovskite structures without secondary phase. MgO doping greatly decreased the sintering temperature and inhibited grain growth. AC impedance spectroscopy measurement was adopted to measure the total conductivity, which was found to increase with MgO doping content ranging from 0 to 3 mol% and subsequently to decrease. High oxygen ionic conductivity σt=0.00629 S/cm was achieved for sample doped with 3 mol% MgO at 600 °C in air atmosphere. |
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| Keywords: | MgO doping Oxide-ion conductivity AC impedance spectroscopy |
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