The synthesis and electrical conductivity of novel mixed ionic and electronic conductors in the Gd2GaSbO7-Gd2Zr2O7 solid solution

H. Takamura, H. L. Tuller

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1 Citation (Scopus)

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 2.6×10-2 S/m for x = 0.0 and 6.0×10-3 S/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.

Original languageEnglish
Pages (from-to)539-543
Number of pages5
JournalMaterials Research Society Symposium - Proceedings
Volume548
Publication statusPublished - 1999 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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