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Oxygen Ion Conductivities of Rhombohedral Phases in the Ba-Sr-Bi Oxide System

Published online by Cambridge University Press:  10 February 2011

O.A. Gökcen ,
S. Kim ,
J.K. Meen ,
D. Elthon  and
A.J. Jacobson
O.A. Gökcen
Affiliation:
Department of Chemistry, University of Houston, Houston, TX 77204-5641
S. Kim
Affiliation:
Department of Chemistry, University of Houston, Houston, TX 77204-5641
J.K. Meen
Affiliation:
Department of Chemistry, University of Houston, Houston, TX 77204-5641
D. Elthon
Affiliation:
Department of Chemistry, University of Houston, Houston, TX 77204-5641
A.J. Jacobson
Affiliation:
Department of Chemistry, University of Houston, Houston, TX 77204-5641
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Abstract

The rhombohedral phase of the Ba-Bi-O system is known to be a good oxygen ion conductor. Previous studies on conductivity of that system have shown that there is a sudden increase in conductivity at the β2-β1 polymorphic transition. Therefore, the high temperature β2 phase is a very good anionic conductor with values up to 10−1-100 S/cm. In the Ba-Sr-Bi-O system, the rhombohedral phase that contains Ba and Sr coexists with BaBiO3. Several specimens of the rhombohedral phase with different [Ba]-[Sr] ratios were synthesized. Electron microprobe analysis was used to determine the chemical composition of each specimen and to ensure that it consisted of a monophasic assemblage. Results of X-ray powder diffraction experiments confirmed that each sample has a rhombohedral unit cell. Oxygen ion conductivities of these materials were measured using the 2-probe AC Impedance technique over the 320-730°C temperature range. In each case, a sudden increase in conductivity indicates temperature range of the polymorphic transition. Exchange of the smaller cation Sr for Ba makes the transition temperature increase almost in a linear manner. Conductivities of all β2 polymorphs at a given temperature are very similar to conductivities of Ba-Bi-O and Sr-Bi-O β2 polymorphs. Conductivities of all β1 polymorphs are also similar. Apparently, the nature of the alkaline earth present has only slight influence on conductivities of these phases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 499
Copyright
Copyright © Materials Research Society 1999

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References

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