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Article Dans Une Revue Ionics Année : 2008

Defect thermodynamic and transport properties of nanocrystalline Gd-Doped ceria

Résumé

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.
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Dates et versions

hal-00360441 , version 1 (11-02-2009)

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S. Surblé (t), G. Baldinozzi, M. Dollé (p), D. Gosset (c), C. Petot, et al.. Defect thermodynamic and transport properties of nanocrystalline Gd-Doped ceria. Ionics, 2008, 14 (1), pp.33-36. ⟨10.1007/s11581-007-0169-9⟩. ⟨hal-00360441⟩
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