Ionic conductivity in the CeO2-Gd2O3system (0.05 ≤ Gd/Ce ≤ 0.4) prepared by oxalate coprecipitation

Zhang Tianshu, Peter Hing, Haitao Huang, J. Kilner

Research output: Journal article publicationJournal articleAcademic researchpeer-review

248 Citations (Scopus)

Abstract

High purity cerium and gadolinium salts were used to form ceria-based solid solution (Ce1-xGdxO2-δ, 0.05 ≤ x ≤ 0.4) through the oxalate coprecipitation. Crystal structure and microstructure were characterized by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The ionic conductivity (i.e., lattice, grain boundary (GB) and total conductivities) in this system were systematically studied as a function of dopant content over the temperature range from 200 to 850 °C in air using an impedance spectroscopy. The grain boundary conductivity increases rapidly at x<0.1 and is almost unchanged between x = 0.1 and x = 0.2, then decreases at x > 0.2. The Gd content has a slighter influence on the lattice conductivity in the Gd content ranging from 0.05 to 0.2, while a rapid decrease in the lattice conductivity is observed at x > 0.2. A maximum total conductivity is observed for the composition x = 0.2.
Original languageEnglish
Pages (from-to)567-573
Number of pages7
JournalSolid State Ionics
Volume148
Issue number3-4
DOIs
Publication statusPublished - 1 Jun 2002
Externally publishedYes

Keywords

  • Ceramic
  • Ceria
  • Electrical conductivity
  • Fuel cell
  • Gadolinia

ASJC Scopus subject areas

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

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