Effects of dopant concentration and aging on the electrical properties of Y-doped ceria electrolytes

T. S. Zhang, J. Ma, Haitao Huang, P. Hing, Z. T. Xia, S. H. Chan, J. A. Kilner

Research output: Journal article publicationJournal articleAcademic researchpeer-review

56 Citations (Scopus)

Abstract

High purity cerium oxide and yttrium oxide were used to form ceria-based solid solution (Ce1-xYxO2-δ, 0.05 ≤ x ≤ 0.4) via a conventional mixed-oxide method. All the samples used were aged at 1000 °C in air for 8 days. Crystal structure and microstructure were characterized by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The ionic conductivity (i.e., grain interior (GI) grain boundary (GB) and total conductivities) in this system were systematically studied as a function of dopant content over the temperature range of 250-850 °C in air using an impedance spectroscopy. The lattice parameter decreased with increasing the Y content, but it did not obey Vegard's law. The Y doping had no significant effect on densification behavior and final sintered density, but leading to a significant decrease in grain size as compared to the undoped ceria. The composition x ≃ 0.1 had a maximum GI conductivity, while a maximum total conductivity was observed at x ≃ 0.15. A significant high-temperature aging effect was also found for the samples with higher Y doping levels. ∼ 10% and ∼ 15% decreases in the GI and GB conductivities, respectively, were detected in the aged Ce0.7Y0.3O2-δceramic.
Original languageEnglish
Pages (from-to)1505-1511
Number of pages7
JournalSolid State Sciences
Volume5
Issue number11-12
DOIs
Publication statusPublished - 1 Jan 2003
Externally publishedYes

Keywords

  • Aging effect
  • Ceramic electrolytes
  • Cerium oxide
  • Electrical properties
  • Yttrium oxide

ASJC Scopus subject areas

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

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