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Dielectric relaxation and electrical conductivity in Ca5Nb4TiO17 ceramics
Affiliation:1. College of Information Science and Engineering, Guilin University of Technology, Guilin 541004, China;2. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi׳an Jiaotong University, Xi׳an 710049, China;3. School of Engineering and Material Science, Queen Mary University of London, London E1 4NS, UK;4. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China;1. Department of Chemistry-UGC Sponsored Centre for Advanced Studies, Guru Nanak Dev University, Amritsar 143005, India;2. Lovely Professional University, Phagwara 144411, India;1. Department of Materials Engineering, Isfahan University of Technology, Isfahan 8415683111, Iran;2. Department of Materials Science and Engineering, Faculty of Engineering, Arak University, Arak 38156-8-8349, Iran;3. Department of Materials Engineering, Malek Ashtar University of Technology, Shahinshahr, Isfahan, Iran;1. Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, People''s Republic of China;2. Institute of Electronics, Microelectronics and Nanotechnology (IEMN)—DOAE, UMR CNRS 8520, Université des Sciences et Technologies de Lille, 59652 Villeneuve d''Ascq Cedex, France;1. State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, China;2. Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;1. Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People׳s Republic of China;2. School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People׳s Republic of China
Abstract:The temperature dependence of dielectric properties and electrical conduction of Ca5Nb4TiO17 ceramics were characterized in a broad temperature range. A dielectric anomaly with strong frequency dispersion was detected in the temperature range 700–1010 °C. This dielectric relaxation could be almost removed completely by annealing in an oxidizing atmosphere. Complex impedance analysis confirmed the electrical inhomogeneity of the ceramics with different contributions from the bulk and grain boundaries. This suggests that the main mechanism for the observed relaxation is the Maxwell–Wagner polarization. ac conductivity results revealed the variation of conduction mechanism with increasing temperatures from localized hopping to long-range motion of the doubly ionized oxygen vacancies.
Keywords:A. Sintering  C. Electrical conductivity  C. Dielectric properties
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