Advertisement

Ionics

, Volume 14, Issue 1, pp 33–36 | Cite as

Defect thermodynamic and transport properties of nanocrystalline Gd-doped ceria

  • S. Surble
  • G. Baldinozzi
  • M. Dollé
  • D. Gosset
  • C. Petot
  • G. Petot-ErvasEmail author
Original Paper

Abstract

Nanocrystalline CeO2-doped (5, 7.5, 10, and 15 mol%) Gd2O3 powders, with a particle size of about 17 nm, were synthesized through the combustion of glycine/nitrate gels. Dense nanocrystalline materials were obtained by hot uniaxial sintering. Optical microscopy, scanning electron microscopy and transmission electron microscopy examinations, as well as X-ray diffraction analyses, have allowed us to characterize these polycrystals. The grain sizes, included between ∼10 and 80 nm, depend on both the sintering temperature and the amount of dopant. A comparison of the transport properties of these nanocrystalline samples to the values obtained with coarsened grained materials of same composition shows that the ionic conductivity passes through a maximum for mean grain sizes included between 300 and 500 nm. Furthermore, an enhancement of the ionic conductivity is observed when the amount of dopant increases. This was attributed to a grain-size-dependent gadolinium segregation at the periphery of the grains confirmed by X-ray photoelectron spectroscopy characterizations.

Keywords

Yttria-doped Ceria Nanocrystalline materials Segregation Ionic conductivity SOFC 

References

  1. 1.
    Chick LA, Pederson LR, Mopan GD, Bates JL, Thomas LE, Exarhos GJ (1990) J Mater Lett 10:6CrossRefGoogle Scholar
  2. 2.
    Petot-Ervas G, Petot C, Raulot JM, Kusinski J, Sproule I, Graham M (2003) Role of the microstructure on the transport properties of Y-doped zirconia and Gd-doped ceria. Ionics 9:195–201CrossRefGoogle Scholar
  3. 3.
    Rizea A, Petot C, Petot-Ervas G, Graham MJ, Sproule GI (2001) Kinetic demixing and grain boundary conductivity of yttria-doped zirconia. Ionics 7:72–84CrossRefGoogle Scholar
  4. 4.
    Aoki M, Chiang YM, Kosaki I, Lee LJ, Tuller H, Liu Y (1996) Solute segregation and grain boundary impedance in high-purity stabilized zirconia. J Am Ceram Soc 79:1169–1180CrossRefGoogle Scholar
  5. 5.
    Monceau D, Petot C, Petot-Ervas G, Fraser JW, Graham MJ, Sproule JI (1995) J Eur Ceram Soc 15:851–858CrossRefGoogle Scholar
  6. 6.
    Rizea A, Petot C, Petot-Ervas G, Abrudeanu M, Graham MJ, Sproule GI (2007) Transport properties of yttrium-doped zirconia—influence of kinetic demixing. Solid State Ion 117:3417–3424CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • S. Surble
    • 1
  • G. Baldinozzi
    • 1
  • M. Dollé
    • 1
  • D. Gosset
    • 1
  • C. Petot
    • 1
  • G. Petot-Ervas
    • 1
    Email author
  1. 1.Research Group CNRS/SPMS- Ecole Centrale ParisGif sur YvetteFrance

Personalised recommendations