Hydrothermal synthesis and properties of ceria solid electrolytes

M. Greenblatt, W. Huang, P. Shuk

Research output: Contribution to journalConference articlepeer-review

Abstract

The structure, thermal expansion coefficients and ionic/electronic conductivity of (Ce1-xSmx)1-y(Tb/Pr)y O(2-x/2)+δ (x = 0-0.30; y = 0-0.10) and Ce1-xCaxO2-x(x = 0-0.17) solid electrolytes prepared hydrothermally were investigated. The uniformly small particle size (7-68 nm) of the hydrothermally prepared materials allows sintering of the samples into highly dense ceramic pellets at 1400 °C, a significantly lower temperature, compared to that at 1600-1650 °C required for samples prepared by solid state techniques. The maximum ionic conductivity in Ce1-x(Sm/Ca)xO2-δ was found at x = 0.17 for the Sm (σ6000 °C = 5.7×10-3 S/cm). In (Ce0.83Sm0.17)1-y (Tb/Pr)yO1.915+δ the maximum conductivity was found at y = 0.10 for the Pr and Tb substituted ceria (σ600 °C = 7.6×10-3 S/cm, Ea = 0.55 eV and σ6000 °C = 10-2 S/cm, Ea = 0.72 eV respectively) with electronic contribution to total conductivity around 20-30%. When the Tb or Pr substitution in Ce0.83Sm0.17O1.915 is reduced, the conductivity becomes more ionic, and is purely ionic at 2%. However the conductivity at this lower level doping is not significantly lower.

Original languageEnglish (US)
Pages (from-to)149-154
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume496
StatePublished - 1998
EventProceedings of the 1998 MRS Fall Symposium - Boston, MA, USA
Duration: Dec 1 1997Dec 5 1997

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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