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Electrical Conductivity in (Gdl-xCax)2Sn2O7±δ Pyrochlore System

Published online by Cambridge University Press:  16 February 2011

Tae-Hwan Yu  and
Harry L. Tuller
Tae-Hwan Yu
Affiliation:
Department of Materials Science and Engineering, Crystal Physics and Electro-Ceramics Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Harry L. Tuller
Affiliation:
Department of Materials Science and Engineering, Crystal Physics and Electro-Ceramics Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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Abstract

Electrical conductivity measurements were performed on Gd2Sn207 as a function of temperature, P02 and Ca doping concentration. An effective frenkel constant and oxygen vacancy mobility were derived. The high level of intrinsic anion disorder found in this study is consistent with expectations based on the cation radius ratio (rA/rB) which was earlier found to be important in determining anion disorder in A2B207 pyrochlore compounds [1]. The magnitude of the ionic conductivity in Gd2Sn2O7 was found to be depressed relative to Gd2(Til-xZrx)207 based systems due to a high oxygen vacancy migration energy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 369: Symposium U – Solid State Ionics IV , 1994 , 371
Copyright
Copyright © Materials Research Society 1995

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References

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