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Improved Dielectric and Nonlinear Electrical Properties of Fine‐Grained CaCu3Ti4O12 Ceramics Prepared by a Glycine‐Nitrate Process |
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| Authors: | Prasit Thongbai Teerapon Yamwong Santi Maensiri Vittaya Amornkitbamrung Prinya Chindaprasirt |
| Affiliation: | 1. Department of Physics, Faculty of Science, Khon Kaen University, , Khon Kaen, 40002 Thailand;2. Integrated Nanotechnology Research Center (INRC), Khon Kaen University, , Khon Kaen, 40002 Thailand;3. National Metal and Materials Technology Center (MTEC), Thailand Science Park, , Pathumthani, 12120 Thailand;4. School of Physics, Institute of Science, Suranaree University, , Nakhon Ratchasima, 30000 Thailand;5. Sustainable Infrastructure Research and Development Center, Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, , Khon Kaen, 40002 Thailand |
| Abstract: | Pure CaCu3Ti4O12 was successfully prepared by a glycine‐nitrate process using a relatively low calcination temperature and short reaction time of 760°C for 4 h. Fine‐grained CaCu3Ti4O12 ceramics with dense microstructure and small grain size were obtained after sintering for 1 h. The nonlinear coefficient of a fine‐grained CaCu3Ti4O12 ceramic calculated in the range 1–10 mA/cm2 was found to be very high of ~16.39 with high breakdown electric field strength of 1.46 × 104 V/cm. This fine‐grained CaCu3Ti4O12 ceramic also exhibited a very low loss tangent of 0.017 at 20°C with temperature stability over the range ?55°C to 85°C. The grain growth rate of the CaCu3Ti4O12 ceramics was found to be very fast after increasing the sintering time from 1.5 to 3 h, leading to formation of a coarse‐grained CaCu3Ti4O12 ceramic with grain size of about 100–200 μm. The dielectric permittivity of this coarse‐grained ceramic was found to be as high as 1.03 × 105 with a low loss tangent of 0.054. |
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