Electrical and dielectric properties of Na_(1/2)La_(1/2)Cu_3Ti_4O_(12) ceramics prepared by high energy ball-milling and conventional sintering |
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| Authors: | H Mahfoz Kotb Mohamad M Ahmad |
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| Affiliation: | 1. Department of Physics, College of Science, King Faisal University, Al-Hassa 31982, Saudi Arabia;2. Department of Physics, Faculty of Science, Assiut University, Assiut 71516, Egypt;3. Department of Physics, Faculty of Science, Assiut University, The New Valley, El-Kharga 72511, Egypt |
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| Abstract: | We report on the measurements of the electrical and dielectric properties of Na1/2La1/2Cu3Ti4O12 (NLCTO) ceramics prepared by high energy ball-milling and conventional sintering without any calcination steps. The x-ray powder diffraction analysis shows that pure perovskite-like CCTO phase is obtained after sintering at 1025℃-1075℃. Higher sintering temperatures result in multi-phase ceramics due to thermal decomposition. Scanning electron microscope observations reveal that the grain size is in a range of ~3 μm-5 μm for these ceramics. Impedance spectroscopy measurements performed in a wide frequency range (1 Hz-10 MHz) and at various temperatures (120 K-470 K) are used to study the dielectric and electrical properties of NLCTO ceramics. A good compromise between high ε' (5.7×103 and 4.1×103 at 1.1 kHz and 96 kHz, respectively) and low tanδ (0.161 and 0.126 at 1.1 kHz and 96 kHz, respectively) is obtained for the ceramic sintered at 1050℃. The observed high dielectric constant behavior is explained in terms of the internal barrier layer capacitance effect. |
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| Keywords: | ceramics sintering dielectric loss and relaxation electrical |
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