Conduction and sintering mechanism of high electrical conductivity Magnéli phase Ti4O7 |
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| Affiliation: | 1. School of Materials and Energy, Southwest University, Chongqing, 400715, China;2. College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, China;1. Department of Ceramic Engineering, IIT BHU, Varanasi, 201005, India;2. Department of Mechanical Engineering, IIT BHU, Varanasi, 201005, India;3. Department of Chemistry, Bar-Ilan Institute for Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, 52900, Ramat Gan, Israel;1. School of Materials Science and Engineering, Shandong University of Technology, 266 West Xincun Road, Zibo, 255049, Shandong, People''s Republic of China;2. Department of Mathematics, Zibo Normal College, 99 Tangjun-ouling Road, Zibo, 255130, Shandong, People''s Republic of China;3. School of Materials Science and Engineering, Tongji University, 4800 Caoan Road, Shanghai, 201804, Shanghai, People''s Republic of China;1. Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, 408100, PR China;2. Chongqing Sports Medicine Center, Department of Orthopedic Surgery, Southwest Hospital, The Third Military Medical University, Chongqing, 400038, People''s Republic of China;3. School of Robot Engineering, Yangtze Normal University, Chongqing, 408100, PR China;4. MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems, CQU-NUS Renewable Energy Materials & Devices Joint Laboratory, School of Energy & Power Engineering, Chongqing University, Chongqing, 400044, China;1. Department of Chemistry, College of Science, University of Tabuk, 71474, Tabuk, Saudi Arabia;2. Department of Chemistry, College of Science, Taibah University, Madinah, P. O. Box 344, Saudi Arabia;3. Department of Chemistry, Faculty of Applied Sciences, Umm Al-Qura University, Makkah, Saudi Arabia;4. Department of Chemistry, Faculty of Science, Taibah University, Yanbu, 30799, Saudi Arabia;5. Department of Chemistry, College of Science, Princess Nourah Bint Abdulrahman University, P.O. Box 84428, Riyadh, 11671, Saudi Arabia;6. Department of Chemistry, Faculty of Science, Mansoura University, Mansoura, Egypt;1. School of Electrical and Mechanical Engineering, The University of Adelaide, Adelaide, 5005, SA, Australia;2. Department of Mechanical and Manufacturing Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia;3. Adelaide Microscopy, The University of Adelaide, Adelaide, 5005, SA, Australia |
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| Abstract: | In this paper, the crystal structure and electronic structure of Ti4O7 were calculated based on density functional theory, and Magnéli phase Ti4O7 bulks were successfully prepared by spark plasma sintering (SPS). Results indicated that the contribution of Ti 3d to Fermi level increased due to the lack of oxygen atom in lattice, and the energy band gap of Ti4O7 was reduced compared with that of TiO2. By calculating the relationship between the densification rate and effective stress in the process of SPS, it can be known that the densification mechanism of Ti4O7 powders was controlled by diffusion. Based on this, under the conditions of sintering temperature of 1000 °C, holding time of 10 min and sintering pressure of 30 MPa, Ti4O7 bulks with the optimal electrical conductivity (961.5 S cm?1) could be obtained, which was more than 30% higher than the graphite material reported in literature. The results reveals that Ti4O7 will be one of the most promising electrode materials in the electrochemical field. |
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| Keywords: | Electrical conductivity Sintering mechanism |
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