Evolution of the local structure at the phase transition in CeO 2-Gd2O3 solid solutions

A. Kossoy, Q. Wang, R. Korobko, V. Grover, Y. Feldman, E. Wachtel, A. K. Tyagi, A. I. Frenkel, Igor Lubomirsky

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

We investigated the local environment of the Ce and Gd ions in one of the most important oxygen ion conductors, the CeO2-Gd2O 3 solid solution, using LIII edge extended x-ray absorption fine structure (EXAFS) spectroscopy and x-ray absorption near edge spectroscopy (XANES). The average Gd-O distance, as deduced by EXAFS, decreases gradually with increasing Gd content, whereas a sharp decrease in the average Ce-O distance occurs at 25 mol% Gd, accompanying the appearance of structural features characteristic of double fluorite symmetry. An abrupt change in the local environment of Ce, rather than of Gd, is also supported by the XANES spectra. Efforts at stabilizing the oxygen conducting Fm-3m phase in CeO 2-Gd2O3 solid solutions should therefore concentrate on tailoring the local environment of the Ce ion. We further suggest that our data may provide an explanation for the recently discovered giant electrostriction effect in Ce0.8Gd0. 2O1.9. Since this composition is at the limit of stability of the fluorite phase, local distortions in Ce0.8Gd 0.2O1.9 may be modulated by an external electric field more readily than those of the other solid solutions.

Original languageEnglish
Article number054101
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number5
DOIs
Publication statusPublished - Feb 4 2013

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x ray absorption
Solid solutions
solid solutions
Phase transitions
X rays
Fluorspar
fluorite
Spectroscopy
Ions
fine structure
Electrostriction
spectroscopy
Oxygen
electrostriction
oxygen ions
ions
conductors
Electric fields
conduction
electric fields

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Evolution of the local structure at the phase transition in CeO 2-Gd2O3 solid solutions. / Kossoy, A.; Wang, Q.; Korobko, R.; Grover, V.; Feldman, Y.; Wachtel, E.; Tyagi, A. K.; Frenkel, A. I.; Lubomirsky, Igor.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 87, No. 5, 054101, 04.02.2013.

Research output: Contribution to journalArticle

Kossoy, A. ; Wang, Q. ; Korobko, R. ; Grover, V. ; Feldman, Y. ; Wachtel, E. ; Tyagi, A. K. ; Frenkel, A. I. ; Lubomirsky, Igor. / Evolution of the local structure at the phase transition in CeO 2-Gd2O3 solid solutions. In: Physical Review B - Condensed Matter and Materials Physics. 2013 ; Vol. 87, No. 5.
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