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Title: Effect of sintering temperature and heat treatment on electrical properties of indium oxide based ceramics
Authors: Glot, AB
Mazurik, SV
Jones, BJ
Bondarchuk, AN
Bulpett, R
Verma, N
Keywords: Indium oxide;Electrical properties;Grain boundaries;Microstructure;Sintering;Heat treatement;Non-ohmic conductivity
Issue Date: 2008
Publisher: University of Manchester
Citation: 11th International Conference on Electroceramics. University of Manchester, Manchester, the UK, Sep 2008.
Abstract: Indium oxide based ceramics with bismuth oxide addition were sintered in air in the temperature range 800-1300 ºC. Current-voltage characteristics of In2O3-Bi2O3 ceramics sintered at different temperatures are weakly nonlinear. After an additional heat treatment in air at about 200 ºC samples sintered at a temperature within the narrow range of about 1050-1100 ºC exhibit a current-limiting effect accompanied by low-frequency current oscillations. It is shown that the observed electrical properties are controlled by the grain-boundary barriers and the heat treatment in air at 200 ºC leads to the decrease in the barrier height. Electrical measurements, scanning electron microscopy and X-ray photoelectron spectroscopy results suggest that the current-limiting effect observed in In2O3-Bi2O3 can be explained in terms of the modified barrier model proposed earlier for the explanation of similar effect in In2O3-SrO ceramics.
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The Experimental Techniques Centre

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