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Please use this identifier to cite or link to this item: 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
Publication 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.
Sponsorship: This study was performed in part in the frames of the project SEP-2003-C02-42821, CONACYT, México. Funding from the Royal Society, United Kingdom (2007R1/R26999) is gratefully acknowledged.
URI: http://bura.brunel.ac.uk/handle/2438/3834
ISSN: 0955-2219
Appears in Collections:Materials Engineering
The Experimental Techniques Centre

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