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Phase Relations And Conductivity In ZrO2-Sc2O3-La2O3 System

Published online by Cambridge University Press:  21 February 2011

Akihiko Yamaji ,
Takao Ishii  and
Masami Kanzaki
Akihiko Yamaji
Affiliation:
Department of Mechanical Enginerring, Tokyo Institute of Technology,Ookayama,Meguroku,Tokyo 152, Japan
Takao Ishii
Affiliation:
NTT Interdisciplinary Research Laboratories, 162 Tokalibaraki 319-11, Japan
Masami Kanzaki
Affiliation:
Department of Mechanical Enginerring, Tokyo Institute of Technology,Ookayama,Meguroku,Tokyo 152, Japan
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Abstract

The oxygen-ion conductor 0.88ZrO2-0.12Sc2O3 has a discontinuous change in ion conductivity at about 660°C. This change accompanies the structural transition from rhombohedral to cubic phase. Since the high temperature cubic phase shows large ion conductivity, it is of interest to examine whether or not the cubic phase stabilizes in the low temperature region by another dopant . By adding only 0.005 mole % La2O3, the cubic phase is stabilized below about 500 °C without any loss of conductivity compared with 0.88ZrO2-0.12Sc2O3. The ion conductivity of cubic stabilized ZrO2-Sc2O3-La2O3 system is around 1×10-1 S/cm at 800°C. Cubic phase stabilization using second dopant in a ZrO2-Sc2O3 system led to the finding of a fast oxygen-ion conductor in the ZrO2-Sc2O3-La2O3 system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 335
Copyright
Copyright © Materials Research Society 1998

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References

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