Dielectric properties with high dielectric permittivity and low loss tangent and nonlinear electrical response of sol-gel synthesized Na1/2Sm1/2Cu3Ti4O12 perovskite ceramic |
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| Affiliation: | 1. Department of Basic Science and Mathematics, Faculty of Science, Thaksin University, Songkhla Campus, Songkhla 90000, Thailand;2. Giant Dielectric and Computational Design Research Group (GD–CDR), Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;3. Synchrotron Light Research Institute (Public Organization), 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand;4. Department of Mathematics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;5. Institute of Nanomaterials Research and Innovation for Energy (IN?RIE), Khon Kaen University, Khon Kaen 40002, Thailand;1. College of Electrical and Information Engineering, Hunan University, 2 Lushan South Road, Changsha, 410082, Hunan, China;2. State Key Laboratory of Electrical Insulation and Power Equipment, Xi`an Jiaotong University, 28 Xianning West Road, Xi`an, 710049, Shaanxi, China;1. Key Laboratory for Macromolecular Science of Shaanxi Province, Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi''an, 710062, Shaanxi, China;2. School of Physics and Information Technology, Shaanxi Normal University, Xi''an, 710062, Shaanxi, China;1. Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;2. Institute of Nanomaterials Research and Innovation for Energy (IN-RIE), Khon Kaen University, Khon Kaen, 40002, Thailand;3. National Metal and Materials Technology Center, National Science and Technology Development Agency, Thailand Science Park, Pathum Thani 12120, Thailand;1. Giant Dielectric and Computational Design Research Group (GD-CDR), Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;2. Synchrotron Light Research Institute (Public Organization), 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand |
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| Abstract: | Giant dielectric ceramic, Na1/2Sm1/2Cu3Ti4O12, was successfully prepared by a modified sol-gel method. X-ray diffraction experiments indicated that a body-centered cubic structure with a space group of Im3 was obtained. Our density functional theory calculations revealed that codoping Na and Sm in the CaCu3Ti4O12 structure resulted in charge compensation between Na and Sm ions in this structure, whereas the oxidation states of Cu and Ti were unaltered. Giant dielectric permittivity ～7.21 × 103 - 8.04 × 103 and low dielectric loss tangent ～0.045–0.049 were accomplished at a sintering temperature of 1050 °C for 12–18 h. Nonlinear J - E property with breakdown electric field ～5.13 – 5.78 × 103 V/cm and nonlinear coefficient ～6.08–6.82 were also achieved. The n-type semiconducting grain originated from short-range migrations of mixed Cu+/Cu2+ and Ti3+/Ti4+ charges. Finally, our charge analysis showed that the occurrence of Cu+ and Ti3+ was related to the existence of oxygen vacancy in these ceramics. |
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| Keywords: | Na- and Sm-based perovskite ceramic First-principles study Electrical properties Loss tangent Dielectric permittivity |
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