Cubic tetragonal equilibrium in the system zirconia-scandia at 1800 degree C: Effect of alumina

The fluorite solid solution in the system ZrO sub(2) - Sc sub(2)O sub(3) has a higher ionic conductivity than most if not all of the binary system stabilized zirconias. Therefore it is of interest as the solid electrolyte in oxygen sensors, particularly for operation at temperatures below normal low...

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Bibliographic Details
Published in:Journal of materials science letters 1983-01, Vol.2 (10), p.561-564
Main Authors: Bannister, M J, Skilton, P F
Format: Article
Language:English
Online Access:Get full text
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Summary:The fluorite solid solution in the system ZrO sub(2) - Sc sub(2)O sub(3) has a higher ionic conductivity than most if not all of the binary system stabilized zirconias. Therefore it is of interest as the solid electrolyte in oxygen sensors, particularly for operation at temperatures below normal lower limit of about 700 degree C. In these solid solutions the precise location of the low-stabilizer phase boundary is important, since the conductivity is degraded by poorly-conducting second phases (tetragonal or monoclinic) at low stabilizer levels and by trapping processes involving stabilizer cation - oxygen vacancy complexes at high stabilizer levels. The effect of alumina on the position of the boundary is of concern to this laboratory because the oxygen sensor developed here for industrial applications comprises a solid electrolyte pellet sealed, by a eutectic welding operation, in the end of an alumina tube.
ISSN:0261-8028