Mechanochemical synthesis and giant dielectric properties of CaCu3Ti4O12 |
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Authors: | Mohamad M Ahmad Eman Al-Libidi Abdullah Al-Jaafari Syed Ghazanfar Koji Yamada |
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Institution: | 1. Department of Physics, College of Science, King Faisal University, Al-Ahsaa, 31982, Saudi Arabia 2. Department of Science and Mathematics, College of Education, Assiut University in The New Valley, El-Kharga, 72511, Egypt 3. Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University, Narashino, Chiba, 275-8575, Japan
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Abstract: | CaCu3Ti4O12 powder has been synthesized by mechanochemical milling (C-m) and solid-state reaction (C-ssr) techniques. C-m powder has a grain size of ~24 nm as determined from X-ray diffraction and FE-SEM measurements. The grain size of C-m ceramics has increased to 20 μm compared to a size of 3 μm for C-ssr ceramics after sintering at 1,050 °C for 10 h. Giant dielectric constant was observed in both ceramics with that of C-m larger than that of C-ssr. Impedance results show that the grain conductivity of C-m is more than two orders of magnitude lower than that of C-ssr, whereas its grain boundary conductivity is larger than that of C-ssr. These results are supported by the EDX results that show Cu-enriched grain boundaries in C-m ceramics. |
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