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Electrical and dielectric properties of Na1/2La1/2Cu3Ti4O12 ceramics prepared by high energy ball-milling and conventional sintering |
| H Mahfoz Kotb1,2, Mohamad M Ahmad1,3 |
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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Received: 03 July 2016
Revised: 23 August 2016
Accepted manuscript online:
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PACS:
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82.45.Xy
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(Ceramics in electrochemistry)
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81.20.Ev
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(Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)
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77.22.Gm
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(Dielectric loss and relaxation)
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84.37.+q
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(Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.))
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Corresponding Authors:
H Mahfoz Kotb, Mohamad M Ahmad
E-mail: hkotb@kfu.edu.sa;mmohamad@kfu.edu.sa
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Cite this article:
H Mahfoz Kotb, Mohamad M Ahmad Electrical and dielectric properties of Na1/2La1/2Cu3Ti4O12 ceramics prepared by high energy ball-milling and conventional sintering 2016 Chin. Phys. B 25 128201
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