AC Impedance Study of NiOx-GDC(1-x) Nanocomposites | |
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( Volume 1 Issue 1,July 2015 ) OPEN ACCESS | |
Author(s): | |
A.U. Chavan, L. D. Jadhav, S. Varma, S.R. Bharadwaj | |
Abstract: | |
The synthesis of nanostructured Gd doped ceria (GDC) and NiO has been reported by a simple and cost effective solution combustion method. The powders were formed at low temperature (~300°C). The NiOx-GDC(1-x) where x = 0.1, 0.2, 0.3, 0.4, 0.5, and 0.6; nano-composites were formed by physical mixing of these nano powders. The grain interior charge transfer mechanism in these nano-composites was confirmed by using impedance spectroscopic measurements in the frequency range from 1 Hz to 10 MHz. The impedance spectroscopic measurements of the composites were examined in the temperature range100°C-600°C. The grain and grain boundary contributions to the electrical conductivity varied with the composition and temperature. The activation energies for both grain and grain boundary conductivity decreased with increase in NiO content. The study also revealed that 40 % NiO content is a percolation limit for NiO-GDC nano-composites. The effect of NiO addition on relaxation behaviour of these NiOxGDC(1-x) nano-composites is investigated for the first time using impedance measurements. |
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