Hydrothermal synthesis and properties of Ce1-xMxO2-δ (M= La, Bi, Sm, Pr, Tb) solid solutions

M. Greenblatt, P. Shuk, W. Huang, S. Dikmen, M. Croft

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3 Scopus citations


A systematic study of hydrothermally prepared Ce1-xMxO2-δ (M= Sm, Bi, Pr, Tb; x= 0-0.30) solid solutions, promising materials for application in solid oxide fuel cells and oxygen membranes is presented. Ultrafine particles of uniform crystallite dimension, ∼ 20 nm can be formed in 30 min. under hydrothermal conditions (260°C, 10 MPa). The small particle size (20-50 nm) of the hydrothermally prepared materials allows sintering of the samples into highly dense ceramics at 900-1350°C, significantly lower temperatures than 1600-1650°C required for samples prepared by solid state techniques. The solubility limit of Bi2O3 in CeO2 was determined to be around 20 mol. %. The maximum conductivity, σ600°C ∼ 4.4×10-3 S/cm with Ea= 1.01 eV, and σ600°C= 5.7×10-3S/cm with Ea≈ 0.9 eV was found at x= 0.20 and x= 0.17 for Bi and Sm, respectively. In the Ce-Pr/Tb oxide systems, in addition to the high oxide ion conductivity, electronic conductivity occurs through the hopping of small polarons by a thermally activated mechanism (electron hopping from the Pr3+/Tb3+ to a neighboring Pr4+/Tb4+ ion).

Original languageEnglish (US)
Pages (from-to)511-517
Number of pages7
JournalMaterials Research Society Symposium - Proceedings
StatePublished - 1999

All Science Journal Classification (ASJC) codes

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


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