e-ISSN 2231-8542
ISSN 1511-3701

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Impedance Studies on Ca0.5Sr0.5Cu3Ti4O12 Ceramic Oxide

Mazni Mustafa, W. Mohamad Daud W. Yusoff, Zainal Abidin Talib, Abdul Halim Shaari and Walter Charles Primus

Pertanika Journal of Tropical Agricultural Science, Volume 17, Issue 1, January 2009

Keywords: CCTO, impedance, grain boundary, Arrhenius

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Ca0.5Sr0.5Cu3Ti4O12 (CSCTO) ceramic oxide was prepared using solid state reaction technique. Impedance measurement was done using High Dielectric Resolution Analyzer (Novocontrol Novotherm) from 30°C to 250°C, in the frequency range of 10-2 to 106 Hz. X-ray diffraction pattern showed a single phase with a cubic structure. In the complex impedance plot, three semi-circles were observed; these represented the grain, grain boundary and electrode effect responses. The semi-circles were fitted using a series network of three parallel RC circuits. The resistance was found to increase with the decreasing temperature. The activation energies, E a, obtained from the Arrhenius plots of CSCTO, were 0.31 eV and 0.73 eV for grain and grain boundary conductivity, respectively. The value of the grain energy was revealed as smaller than the grain boundary energy, due to the semi-conducting grain and the insulating grain boundary characteristic (Sinclair et al., 2002).

ISSN 1511-3701

e-ISSN 2231-8542

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