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Transport Properties And Crystal Chemistry Of Ba-Sr-Bi Oxides

Published online by Cambridge University Press:  18 March 2011

Oya A. Gökçen ,
James K. Meen ,
Allan J. Jacobson  and
Don Elthon
Oya A. Gökçen
Affiliation:
Department of Chemistry, Texas Center for Superconductivity, and Materials Research Science and Engineering Center, University of Houston, Houston, Texas 77204, U.S.A
James K. Meen
Affiliation:
Department of Chemistry, Texas Center for Superconductivity, and Materials Research Science and Engineering Center, University of Houston, Houston, Texas 77204, U.S.A
Allan J. Jacobson
Affiliation:
Department of Chemistry, Texas Center for Superconductivity, and Materials Research Science and Engineering Center, University of Houston, Houston, Texas 77204, U.S.A
Don Elthon
Affiliation:
Department of Chemistry, Texas Center for Superconductivity, and Materials Research Science and Engineering Center, University of Houston, Houston, Texas 77204, U.S.A
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Abstract

Rhombohedral (R) phases of the binary systems AE-Bi-O (AE = Ca, Sr, Ba) have low temperature (β2) and high temperature (β1) polymorphs and the β1 polymorph is a good oxygen ion conductor. In a previous study, we showed that in the ternary system Ba-Sr-Bi-O, conductivities of polycrystalline R samples are unaffected by Ba:Sr, whereas temperature ranges of the β2↔β1 polymorphic transition are. Recently, we proved that the conductivity of both polycrystalline and single-crystal R samples is sensitive to spatial direction. For single crystals, the conductivity is highest perpendicular to the c-axis. Along the conduction plane, the conductivities are significantly higher than those of polycrystalline R samples; perpendicular to that plane they are significantly lower. The BaBiO3 perovskite (P) phase, predominantly an electronic conductor, has conductivities of 10 to 102 S/cm at 350-800°C in air. Conductivity measurements of the R-P assemblages with different R:P showed that percolation threshold is around 35 volume % P.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 658: Symposium GG – Solid-State Chemistry of Inorganic Materials III , 2000 , GG4.7
Copyright
Copyright © Materials Research Society 2001

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References

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