© Global Journal Of Pure And Applied Sciences . 2002. Vol. 8 No. 1
Publisher: Bachudo Science Co. Ltd
The Impedance Measure of Yttrium Aluminium Garnet Doped With Cadmium Oxide.
I. O. Owate, E. Chukwuocha
KEYWORDS: Impedance, doping, Yttrium Aluminum, Conductance
ABSTRACT:Yttrium Aluminium Garnet (Y3Al5012 or YAG) doped with Cadmium oxide (CdO) was fabricated and the electrical conductance investigated. The impedance technique was applied in the study of the electrical conductance whereas the famous sintering by powder mixing process was used in producing the pellets of the system. The system showed two distinct dumb-bell envelopes of impedance curves. This assisted in the discrimination and extraction of the conductance components as grain and grain boundary conductance. The analyses of the results showed a mixed ionic n-type electronic conductivity with the main contributor as defects clusters at the intergranular grain junctions where impurities appear to segregate. It has been suggested that Cd' + and other impurity ions were responsible for the electronic conductivity of the samples. An activation energy of about 1.62 eV was calculated for the best sample in terms of composition. Consequently, the characteristics of the system suggest that the materials is corrosion resistance and translucent and could be applied in most electrical and electronic industries.
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