Enhanced non-linear current-voltage response of Te-doped calcium copper titanate ceramics |
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| Affiliation: | 1. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, PR China;2. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, PR China;3. Changzhou Ming Errui Ceramics Co., Ltd., Changzhou 213102, PR China;4. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, PR China;5. State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University, Beijing 100084, PR China;1. Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Bukgu, Gwangju 500-757, Republic of Korea;2. Department of Applied Chemistry, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, UP, India;3. Department of Ceramic Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, UP, India;1. GREMAN, UMR 7341 CNRS, Université François Rabelais, UFR Sciences et Techniques, Parc de Grandmont, 37200 Tours, France;2. SRT Microcéramique, Rue Mons, 41100 Vendôme, France;1. Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials (Anhui University of Technology), Ministry of Education, Ma’anshan 243002, PR China;2. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Anhui University of Technology), Ministry of Education, Ma’anshan 243002, PR China;3. Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450001, PR China;4. National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Luoyang 471023, PR China;1. Integrated Nanotechnology Research Center and Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand;2. School of General Science, Faculty of Liberal Arts, Rajamangala University of Technology Rattanakosin, Wang Klai Kangwon Campus, Hua Hin, Prachaub Khiri Khan, 77110, Thailand |
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| Abstract: | The influence of partial replacement of Ti4+ ions by Te4+ in calcium copper titanate lattice on dielectric and non-linear current- voltage (I–V) characteristics was systematically studied. There was a remarkable increase in the values of the nonlinear coefficient (α) with Te4+ doping concentration in CaCu3Ti4-xTexO12 (where, x=0, 0.1, 0.2).For instance, the α values increase from 2.9 (x=0) to 22.7 (x=0.2) for ceramics sintered at 1323 K/8 h. The room temperature value of current density (J) at the electrical field of 250 V/cm for CaCu3Ti3.8Te0.2O12 ceramics is almost 400 times higher than that of the pure CaCu3Ti4O12 ceramics sintered at 1323 K. A systematic investigation into I–V behaviour as a function of temperature gave an insight into the conduction mechanisms of undoped and doped ceramics of calcium copper titanate (CCTO). The calculated potential barrier value for doped ceramics (~ 0.21 eV) dropped down to almost one third that of the undoped ceramics (~ 0.63 eV). |
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| Keywords: | Electrical properties Perovskites Varistors |
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