Impedance and electric modulus approaches to investigate four origins of giant dielectric constant in CaCu3Ti4O12 ceramics |
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| Institution: | 1. College of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen 518060, PR China;2. Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong;1. Institute of Materials Science and Technology (INTEMA), University of Mar del Plata (UNMdP), National Research Council (CONICET), Av. Juan B. Justo 4302, (B7608FDQ) Mar del Plata, Argentina;2. Faculdade de Engenharia de Guaratinguetá, Universidade Estadual Paulista, UNESP, Av. Ariberto Pereira da Cunha, 333, CEP: 12516-410 Guaratinguetá, SP, Brazil;3. CTI Renato Archer, Rodovia D. Pedro I (SP - 65) Km 143,6, CEP: 13069-901 Campinas, SP, Brazil;1. Department of Physics, Siksha ‘O’ Anusandhan (deemed to be University), Bhubaneswar, Odisha, India;2. Department of Material Science, Indian Institute of Technology, Bhubaneswar, India;1. School of Science, Xi’an Polytechnic University, Xi’an 710048, China;2. State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China;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. Department of Chemistry, University of Ulsan, 93 Daehak-ro Nam-gu, Ulsan 680-749, Republic of Korea;2. Department of Chemistry, Centre of Advanced Study, Faculty of Science, Banaras Hindu University, Varanasi 221005, U.P., India;3. Department of Chemistry, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, U.P., India;4. Advanced Battery Materials Team R&D Center, GS Energy, Daejeon 305-380, Republic of Korea;1. Department of Materials and Earth Science, Technical University of Darmstadt, FG Nichtmetallisch-Anorganische Werkstoffe, Alarich-Weiss-Straße 2, 64287, Darmstadt, Germany;2. Department of Materials and Earth Science, Technical University of Darmstadt, FG Mechanics of Functional Materials, Otto-Berndt-Straße 3, 64287, Darmstadt, Germany;3. Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Functional Materials and Materials Chemistry Group (FACET), Sem Sælands Vei 12, 7491, Trondheim, Norway |
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| Abstract: | The frequency dependence of electric modulus of polycrystalline CaCu3Ti4O12 (CCTO) ceramics has been investigated. The experimental data have also been analyzed in the complex plane of impedance and electric modulus, and a suitable equivalent circuit has been proposed to explain the dielectric response. Four dielectric responses are first distinguished in the impedance and modulus spectroscopies. The results are well interpreted in terms of a triple insulating barrier capacitor model. Using this model, these four dielectric relaxations are attributed to the domain, domain-boundary, grain-boundary, and surface layer effects with three Maxwell–Wagner relaxations. Moreover, the values of the resistance and capacitance of bulk CCTO phase, domain-boundary, grain-boundary and surface layer contributions have been calculated directly from the peak characteristics of spectroscopic plots. |
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