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Ionic Conductivity Study on the New High Oxide Conducting Perovskite LaGaO3

Published online by Cambridge University Press:  10 February 2011

G.V.M. Kiruthika  and
U.V. Varadaraju
G.V.M. Kiruthika
Affiliation:
Materials Science Research Centre, Indian Institute of TechnologyChennai-600 036, INDIA
U.V. Varadaraju
Affiliation:
Materials Science Research Centre, Indian Institute of TechnologyChennai-600 036, INDIA
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Abstract

Oxide ion conductivity studies have been done on the Lanthanum Gallate based compounds. Yttrium substitution at the Ga site has been attempted to increase the unit cell size. Single phase was obtained for limited Y substituion i.e., La0.9Sr0.1Ga0.7Y0.1Mg0.2O3-x. It is found that the activation energy for the oxide ion conductivity has decreased for this composition. Based on the tolerance factor and B-site radius values, the migration energies were obtained for the LaGaO3 based perovskites. It is observed that migration energy has been significantly reduced upon substitution at the B-site. Absence of an enhancement in the conductivity with Yttrium substitution could be due to the vaccancy ordering inhibiting the oxide ion migration.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 527: Symposium Z – Diffusion Mechanisms in Crystalline Materials , 1998 , 503
Copyright
Copyright © Materials Research Society 1998

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References

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