Hydrothermal synthesis and low temperature conduction properties of substituted ceria ceramics

Kimihiro Yamashita, K. V. Ramanujachary, Martha Greenblatt

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129 Scopus citations

Abstract

Rare earth or alkaline earth oxide-substituted ceria (CeO2) powders were successfully prepared via hydrothermal synthetic route. Using these powders after freeze-drying, highly dense ceramics of Ce1-xMxO2 with M = Ca2+, Sr2+, Sm3+, Gd3+ and Y3+ and x = 0.2 were prepared by sintering at much lower temperatures than 1700 °C, common for CeO2 preparation by conventional ceramic techniques. For example, 20 mol% samaria-substituted ceria with 98% of the theoretical density was sintered at 1450 °C. The conductivities determined by an ac impedance method were approximately 100 times higher than that of yttria-stabilized zirconia (YSZ). The conductivity was optimal with Sm3+ substitution (σ(210 °C) ~10-6 S/cm). The analysis of the impedance spectra indicate that the observed impedance at the relatively low temperatures of measurement (300-600 °C) is predominantly dependent on grain boundary effects.

Original languageEnglish (US)
Pages (from-to)53-60
Number of pages8
JournalSolid State Ionics
Volume81
Issue number1-2
DOIs
StatePublished - Oct 1995

All Science Journal Classification (ASJC) codes

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

Keywords

  • Grain boundary effects
  • Hydrothermal synthesis
  • Impedance spectra
  • Ionic conductivity
  • Rare earth and alkaline earth metal substituted ceria

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