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Giant dielectric permittivity observed in Li and Zr co-doped NiO
Authors:S Manna  SK De
Institution:1. Department of Physics, Centre Universitaire de Bordj-Bou-Arreridj, El-Anasser, 34265 Bordj-Bou-Arreridj, Algeria;2. Department of Physics, Faculty of Science, Science and Technology Unit, King Khalid University, Abha, P.O. Box 9004, Saudi Arabia;1. School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471003, People''s Republic of China;2. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Qianjin Street 2699, Changchun 130012, People''s Republic of China;3. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116023, People''s Republic of China;1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, PR China;2. International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, PR China;1. P.G. and Research Department of Physics, Sri Paramakalyani College, Alwarkurichi 627412, India;2. Department of Physics, V.V. College of Engineering, Tisaiyanvilai 627657, India;3. Department of Applied Physics, Indian Institute of Technology, Dhanbad 826004, India
Abstract:The dielectric properties of Li and Zr co-doped NiO (abbreviated as LZNO) ceramics have been investigated. A high dielectric constant (~104) is observed which remains almost constant in a wide temperature (233 K–373 K) and frequency (100 Hz–10 MHz) range. Analysis of the ceramic micro structure and composition indicates that the alkali Li has an excellent effect on the dielectric properties of LZNO ceramics. The increase of dielectric constant with Li concentration is associated with a decrease of dielectric loss. The dielectric behavior of LZNO is discussed based on the internal boundary layer capacitor model.
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