Hydrothermal Synthesis and Properties of Ce1-xSmxO2-x/2 and Ce1-xCaxO2-x Solid Solutions

W. Huang, P. Shuk, M. Greenblatt

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The structure, thermal expansion coefficients and ionic conductivity of Ce1-xSmxO2-x/2 and Ce1-xCaxO2-x (x = 0-0.30) solid electrolytes prepared hydrothermally in a relatively wide concentration range for the first time were systematically investigated. The uniformly small particle size (40-68 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°C required for samples prepared by solid-state techniques. The maximum ionic conductivity was found at x = 0.17 for the Sm and at x = 0.09 for the Ca-substituted ceria (σ600°C = 5.7 × 10-3 S/cm, Ea ≈ 0.9 eV, and σ600°C = 2.1 × 10-3 S/cm, Ea ≈ 0.8 eV, respectively). The thermal expansion coefficients, determined from high-temperature X-ray data, are 8.6 × 10-6 and 9.4 × 10-6 K-1 for the best conducting Ce0.83Sm0.17O1.915 and Ce0.91Ca0.09O1.91 solid electrolytes, respectively.

Original languageEnglish (US)
Pages (from-to)2240-2245
Number of pages6
JournalChemistry of Materials
Issue number10
StatePublished - Oct 1997

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry


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