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The Synthesis and Electrical Conductivity of Novel Mixed Ionic and Electronic Conductors in The Gd2GaSbO7-Gd2Zr2O7 Solid Solution

Published online by Cambridge University Press:  10 February 2011

H. Takamura  and
H. L. Tuller
H. Takamura
Affiliation:
Crystal Physics & Electroceramics Laboratory, Department of Materials Science & Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, htakamur@mit.edu
H. L. Tuller
Affiliation:
Crystal Physics & Electroceramics Laboratory, Department of Materials Science & Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, hltuller@mit.edu
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Abstract

The synthesis and electrical conductivity of a novel solid solution pyrochlore Gd2GaSbO7 - Gd2Zr2O7 were studied as a function of x in Gd2(GaSb)1-xZr2xO7 (0 ≤ x ≤ 1). In this study, single phases with the pyrochlore structure were obtained in the range of x ≤ 0.2, while a garnet phase appeared as a minor second phase for x ≥ 0.3. In the x = 0.2 sample, evidence of the displacement of 48f oxygens towards the normally empty 8b site was suggested by Rietveld analysis. The total electrical conductivity of the pyrochlores was 2.6x 10−2 S/m for x = 0.0 and 6.0×10−3S/m for x = 0.2 at 1273 K, respectively. In addition, evidence for n-type semiconductivity was obtained for x = 0.2 under reducing conditions. Further studies are underway to identify the dominant carriers under oxidizing conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 539
Copyright
Copyright © Materials Research Society 1999

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References

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