Hydrothermal synthesis and properties of Ce1-xEuxO2-δ solid solutions

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Abstract

The structure, thermal expansion coefficients and ionic and electronic conductivities of Ce1-xEuxO2-δ (x = 0-0.50) solid solutions, prepared hydrothermally for the first time, were investigated. The uniformly small particle size (40-55 nm) of the hydrothermally prepared materials allows sintering of the samples into highly dense ceramic pellets at 1300-1400°C, a significantly lower temperature than 1600-1650°C, which is required for samples prepared by solid-state techniques. X-ray absorption spectroscopy (XAS) was used to establish the pure Eu3+ character of the europium ions; XAS also reflects local disorder effects. The highest conductivity was found for Ce0.85Eu0.15O1.925-δ700°C = 2.6 × 10-2 S/cm, Ea = 0.66 eV) with predominantly oxide-ion mobility.

Original languageEnglish (US)
Pages (from-to)465-471
Number of pages7
JournalJournal of Alloys and Compounds
Volume303-304
DOIs
StatePublished - May 24 2000
Event22nd Rare Earth Research Conference - Argonne, IL, United States
Duration: Jul 11 1999Jul 15 1999

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Keywords

  • Electronic conductivity
  • Hydrothermal synthesis
  • Ionic conductivity
  • Thermal expansion coefficients

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