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http://bura.brunel.ac.uk/handle/2438/3834
Title: | Current limiting and negative differential resistance in indium oxide based ceramics |
Authors: | Glot, AB Mazurik, SV Jones, BJ Bondarchuk, AN Bulpett, R Verma, N |
Keywords: | Electroceramics;Ceramics;Sintering;Grain boundaries;Electrical properties;Varistors;Indium oxide;Bismuth oxide |
Issue Date: | 2009 |
Publisher: | Elsevier |
Citation: | Journal of the European Ceramic Society. 30 (2010) 539–544 |
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 may be explained in terms of a modified barrier model; the observed current-limiting effect is the result of an increase of barrier height with increasing electric field, due to additional oxygen absorption. It is found that In2O3-Bi2O3-Co3O4-Cr2O3 ceramic exhibits current-voltage characteristics with negative differential resistance due to Joule micro heating. |
URI: | http://bura.brunel.ac.uk/handle/2438/3834 |
ISSN: | 0955-2219 |
Appears in Collections: | Materials Engineering The Experimental Techniques Centre |
Files in This Item:
File | Description | Size | Format | |
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InGlot-BJJ-JECS-archive.pdf | 451.65 kB | Adobe PDF | View/Open |
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