Dielectric behavior and impedance analysis of lead-free CuO doped (Na0.50K0.50)0.95(Li0.05Sb0.05Nb0.95)O3 ceramics |
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| Affiliation: | 1. Ferroelectric Research Laboratory, Department of Physics, A. N. College, Patna 800013, India;2. Department of Ceramics and Glass Engineering and CICECO, University of Aveiro, 3810-193 Aveiro, Portugal;1. Nanochemistry Laboratory, Department of Chemistry, Jamia Millia Islamia, New Delhi 110025, India;2. Department of Chemistry, Banasthali University, Tonk, Rajasthan 304022, IndiaFrom Next Line:;3. School of Science and Technology, Glocal University, Mirzapur, Saharanpur, 247121, Uttar Pradesh, India;4. Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;1. Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland;2. Institute of Chemistry, University of Silesia, ul. Szkolna 9, 40-003 Katowice, Poland;3. Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany;4. Department of Physics, Hallym University, 1 Hallymdaehakgil, Chuncheon, Gangwondo 24252, South Korea;1. School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;2. CREST, Japan Science and Technology Agency, 4-8-1 Honcho, Kawaguchi, Saitama 332-0012, Japan;1. Analytical and Testing Center, Southwest University of Science and Technology, Mianyang, Sichuan 621010, PR China;2. Center for Condensed Matter Science and Technology (CCMST), Department of Physics, Harbin Institute of Technology, Harbin 150001, PR China;1. Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), Av. Juan B Justo 4302, B7608FDQ Mar del Plata, Argentina;2. Electroceramic Department, Instituto de Cerámica y Vidrio, CSIC, Kelsen 5, 28049 Madrid, Spain |
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| Abstract: | Pure (Na0.50K0.50)0.95(Li0.05Sb0.05Nb0.95)O3 (NKNLS) and CuO doped NKNLS perovskite structured ferroelectric ceramics were prepared by the solid-state reaction method. x wt% of CuO (x = 0.2–0.8 wt%) was added in the NKNLS ceramics. X-ray diffraction patterns indicate that single phase was formed for pure NKNLS while a small amount of second phase (K6Li4Nb10O30 ∼ 3%) was present in Cu2+ doped NKNLS ceramics. Dielectric anomalies around the temperatures of 120 °C and 350 °C have been identified as the ferroelectric–paraelectric transition (orthorhombic to tetragonal and tetragonal to cubic) temperatures for pure NKNLS compound. The electrical behavior of the ceramics was studied by impedance study in the high temperature range. Impedance analysis has shown the grain and grain boundary contribution using an equivalent circuit model. The impedance response in pure and Cu2+ doped NKNLS ceramics could be resolved into two contributions, associated with the bulk (∼grains) and the grain boundaries. From the conductivity studies, it is found that activation energies are strongly frequency dependent. The activation energy obtained from dielectric relaxation data may be attributed to oxygen ion vacancies. |
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