Islam, Q A and Nag, Sourav and Basu, Rajendra Nath (2013) Electrical properties of Tb-doped barium cerate. Ceramics International, 39 (6). pp. 6433-6440. ISSN 0272-8842

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Abstract

The electrical conductivity of Ba0.8Ce1-xTbxO3-delta (0 <= x <= 0.15) has been studied in air and moist reducing atmosphere (5% H2 in Ar) in the temperature range between 550 and 900 degrees C. The powders of such materials are prepared by the combustion synthesis technique. The microstructure of the sintered specimens correlates well with its electrical properties. Electrical conduction mechanism of sintered specimens in various atmospheres is explained with respect to defect sites formed within the material. The generation of hydroxyl vacancy, proton and hole in moist reducing atmosphere increases the protonic conductivity significantly compared to hole/oxide ion conductivity in air atmosphere. Grain and grain boundary conductivity have been determined from the impedance measurements. The complex mechanism of electrical conduction of the sintered materials does not follow the linear behaviour in the Arrhenious plot. Maximum electrical conductivity obtained under moist reducing atmosphere is 0.049 S cm(-1) for Ba0.8Ce0.85Tb0.15O3-delta at 900 degrees C. (C)c 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Item Type:	Article
Subjects:	Electronics
Divisions:	Fuel Cell and Battery
Depositing User:	Bidhan Chaudhuri
Date Deposited:	10 Sep 2013 08:46
Last Modified:	10 Sep 2013 08:46
URI:	http://cgcri.csircentral.net/id/eprint/2134

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