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Enhanced Ionic Conduction in Dispersed Solid Electrolyte Systems $CaF_2-Al_2O_3$ and $CaF_2-CeO_2$

Vaidehi, N and Akila, R and Shukla, AK and Jacob, KT (1986) Enhanced Ionic Conduction in Dispersed Solid Electrolyte Systems $CaF_2-Al_2O_3$ and $CaF_2-CeO_2$. In: Materials Research Bulletin, 21 (8). pp. 909-916.

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Abstract

Dispersions of $Al_2O_3$ as well as $CeO_2$ a in $CaF_2$ are found to enhance the conductivity of $CaF_2$ . Both these systems are biphasic and the electrical conduction in them is purely ionic in nature. At 650 K the increase in the ionic conductivity of the dispersed solid electrolyte system $CaF_2-Al_20_3$ a is by about two orders of magnitude in relation to the conductivity of the host electrolyte $CaF_2$, whereas for the $CaF_2-CeO_2$ system it is about three orders of magnitude. Some aspects of the increase in the ionic conductivities of $CaF_2-Al_20_ 3$ and $CaF_2-CeO_2$ electrolytes can be explained by a recent theoretical model. It is proposed that a substantial enhancement in the vacancy concentration of $CaF_2$, brought about by the attraction of $F^-$ ions to the surface of $Al_20_3$ (or $CeO_2$) , is responsible for the low temperature increase in the ionic conductivity of $CaF_2$.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 15 Jul 2008
Last Modified: 19 Sep 2010 04:47
URI: http://eprints.iisc.ernet.in/id/eprint/14964

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