Electronic and ionic conductivity of Eu0.2Ce0.8O 2-δ

L. Zhao, N. H. Perry, K. Sasaki, S. R. Bishop

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Eu-doped cerium oxide was synthesized and its crystal structure was analyzed by X-ray diffraction. The electrical conductivity was measured by impedance spectroscopy at 350-900 °C over a wide range of controlled oxygen partial pressures, from H2 to O2, using gas mixtures. In the high pO2 region, ionic conductivity is predominant, and the activation energy for total conductivity is 0.8 ± 0.01 eV. In low pO 2, the conductivity is found to obey a - 1/4 power law dependence on pO2, with an enthalpy of reduction of 4.2 ± 0.16 eV. These results demonstrate that Eu has a similar effect on electrical properties as Gd or Sm acceptor dopants in ceria, namely, that Eu shows no evidence for multivalent behavior; rather, it appears to be a fixed valent dopant in the fluorite structured ceria, in contrast to prior studies finding multivalency of Eu in perovskite oxides under similar conditions.

Original languageEnglish
Pages (from-to)75-79
Number of pages5
JournalSolid State Ionics
Volume263
DOIs
Publication statusPublished - Oct 1 2014

Fingerprint

Cerium compounds
Ionic conductivity
ion currents
Doping (additives)
cerium oxides
conductivity
Oxides
Fluorspar
fluorite
Cerium
electronics
Gas mixtures
Partial pressure
Perovskite
partial pressure
gas mixtures
Enthalpy
Electric properties
Activation energy
Crystal structure

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Electronic and ionic conductivity of Eu0.2Ce0.8O 2-δ. / Zhao, L.; Perry, N. H.; Sasaki, K.; Bishop, S. R.

In: Solid State Ionics, Vol. 263, 01.10.2014, p. 75-79.

Research output: Contribution to journalArticle

Zhao, L. ; Perry, N. H. ; Sasaki, K. ; Bishop, S. R. / Electronic and ionic conductivity of Eu0.2Ce0.8O 2-δ. In: Solid State Ionics. 2014 ; Vol. 263. pp. 75-79.
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