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Application of composition gradient solid electrolytes in sensors and thermodynamic measurements

Jacob, KT and Mukhopadhyay, Sukauya (1994) Application of composition gradient solid electrolytes in sensors and thermodynamic measurements. In: Proc. Second International Symposium on Ionic and Mixed Conducting Ceramics, 1994, Pennington, U.S.A.

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New compos~tiong radient solid electrolytes are developed which have application in high temperature solid state galvanic sensors and provide a new tool for thermodynamic measurements. The electrolyte consists oi a solid solution between two ionic conductors with a common mobile ion and spatial variation in composition of otber coxup nents. Incorporation of the composite electrolyte in sensors permits the use oi dissimilar gas electrodes. It is demonsuated, both experimentall y and theoretically, that the composition gradient of the relativeiy immobile species does not give rise to a diffusion potential.The emi of a cell is determined by the activity of the mobile species at the two eiectrodes. The thermodynamic properties of solid solutions can be measured using the gradient solid electrolyte. The experimental stuay is based on model systems A?(COj)x(S04)l-x (A=Na,K),where S \.aria across the electrolyte. The functionally gradient solid electrolytes used for activity measurements consist of pure carbonate at one ena and the solid solution under stuav at the other. The identical vaiues of activity, obtained h m t hree different modes of operation of the ceil. indicate unit transport number for the ddi metal ion in the graciient electrolyte. Tlle activities in the solid solutions exhibit moderate positive deviations from Raoult 's law.

Item Type: Conference Paper
Publisher: The Electrochemical Society
Additional Information: Copyright of this article belongs to The Electrochemical Society.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 01 Mar 2012 06:34
Last Modified: 01 Mar 2012 06:34
URI: http://eprints.iisc.ac.in/id/eprint/42686

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