Hydrothermal synthesis and properties of mixed conductors based on Ce1-xPrxO2-δ solid solutions

P. Shuk, M. Greenblatt

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139 Scopus citations

Abstract

The structure, thermal expansion coefficients and ionic and electronic conductivities of Ce1-xPrxO2_δ (x = 0-0.50) solid solutions, prepared hydrothermally for the first time, were investigated. The uniformly small particle size (35-50 nm) of the hydrothermally prepared materials allows sintering of the samples into highly dense ceramic pellets at 130O0C, a significantly lower temperature, compared to that at 1600-1650°C required for samples prepared by solid-state techniques. The maximum of total conductivity was found at x = 0.30 (σ700°c = 1.4 × 10-2 S/cm, σ600°c = 5.9 × 10-3 S/cm; Ea = 0.47 eV) with electronic contribution to the total conductivity around 50%. The thermal expansion coefficients, determined from high-temperature X-ray data, are 11.8 × 10-6 K-1 for CeO2 and slowly increase with increasing Pr substitution (12.4 × 10-6 K- at x = 0.30).

Original languageEnglish (US)
Pages (from-to)217-223
Number of pages7
JournalSolid State Ionics
Volume116
Issue number3-4
DOIs
StatePublished - 1999

All Science Journal Classification (ASJC) codes

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

Keywords

  • Ceria solid electrolytes
  • Hydrothermal preparation
  • Mixed conductors
  • Oxygen membranes

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