Please use this identifier to cite or link to this item:
http://bura.brunel.ac.uk/handle/2438/5636
Title: | Electronic properties of SnO2-based ceramics with double function of varistor and humidity sensor |
Authors: | Glot, AB Sandoval-García, AP Gaponov, AV Bulpett, R Jones, BJ Jimenez-Santana, G |
Keywords: | Electrical conduction;Grain boundary;Varistor;Electroceramics;Humidity sensor;Tin dioxide |
Issue Date: | 2009 |
Publisher: | AD-TECH |
Citation: | Advances in Technology of Materials and Materials Processing 10: 21-32, Apr 2009 |
Abstract: | Tin dioxide based varistor ceramics SnO2-Co3O4-Nb2O5-Cr2O3-xCuO (x=0; 0.05; 0.1 and 0.5) were made and their electrical properties were studied. The highest nonlinearity coefficient and electric field (at current density 10-3 A cm-2) were obtained for 0.1 mol.% CuO addition. It was observed that low-field electrical conductivity is increased with relative humidity, therefore, materials obtained exhibit double function of varistor and humidity sensor. The highest humidity sensitivity coefficient is found for SnO2-Co3O4-Nb2O5-Cr2O3 ceramics (without CuO). Observed varistor and humidity-sensitive properties are explained in the frames of grain-boundary double Schottky barrier concept as a decrease of the barrier height with electric field or relative humidity. Using suggested simple theory and data obtained on isothermal capacitance relaxation, the energy of the grain-boundary monoenergetic trapping states were estimated. These values are less than found for activation energy of electrical conduction (as a measure of the barrier height). These observations confirm the barrier concept. |
Description: | This is the post-print version of the article. The official published version can be obtained from the link below - Copyright @ 2010 AD-Tech. |
URI: | http://www.azom.com/article.aspx?ArticleID=4718 http://bura.brunel.ac.uk/handle/2438/5636 |
DOI: | http://dx.doi.org/10.2240/azojomo0277 |
ISSN: | 1440-0731 |
Appears in Collections: | Materials Engineering Publications The Experimental Techniques Centre |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Fulltext.pdf | 426.44 kB | Adobe PDF | View/Open |
Items in BURA are protected by copyright, with all rights reserved, unless otherwise indicated.