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Ionic conductivity in nanocrystalline Gd doped ceria

Published online by Cambridge University Press:  20 February 2017

Gianguido Baldinozzi ,
David Simeone ,
Dominique Gosset ,
Mickael Dollé  and
Georgette Petot-Ervas
Gianguido Baldinozzi
Affiliation:
Matériaux fonctionnels pour l'énergie, SPMS, CNRS-Ecole Centrale Paris, 92295 Châtenay-Malabry & DEN/DANS/DMN/SRMA/LA2M, CEA Saclay, 91191 Gif-sur-Yvette, France
David Simeone
Affiliation:
Matériaux fonctionnels pour l'énergie, SPMS, CNRS-Ecole Centrale Paris, 92295 Châtenay-Malabry & DEN/DANS/DMN/SRMA/LA2M, CEA Saclay, 91191 Gif-sur-Yvette, France
Dominique Gosset
Affiliation:
Matériaux fonctionnels pour l'énergie, SPMS, CNRS-Ecole Centrale Paris, 92295 Châtenay-Malabry & DEN/DANS/DMN/SRMA/LA2M, CEA Saclay, 91191 Gif-sur-Yvette, France
Mickael Dollé
Affiliation:
Matériaux fonctionnels pour l'énergie, SPMS, CNRS-Ecole Centrale Paris, 92295 Châtenay-Malabry & DEN/DANS/DMN/SRMA/LA2M, CEA Saclay, 91191 Gif-sur-Yvette, France
Georgette Petot-Ervas
Affiliation:
Matériaux fonctionnels pour l'énergie, SPMS, CNRS-Ecole Centrale Paris, 92295 Châtenay-Malabry & DEN/DANS/DMN/SRMA/LA2M, CEA Saclay, 91191 Gif-sur-Yvette, France
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Abstract

We have synthesized Gd-doped ceria polycrystalline samples (5, 10, 15 %mol), having relative densities exceeding 95% and grain sizes between 30 and 160 nm after axial hot pressing (750 °C, 250 MPa). The samples were prepared by sintering nanopowders obtained by sol-gel chemistry methods having a very narrow size distribution centered at about 16 nm. SEM and X-ray diffraction were performed to characterize the sample microstructures and to assess their structures. We report ionic conductivity measurements using impedance spectroscopy. It is important to investigate the properties of these systems with sub-micrometric grains and as a function of their composition. Therefore, samples having micrometric and nanometric grain sizes (and different Gd content) were studied. Evidence of Gd segregation near the grain boundaries is given and the impact on the ionic conductivity, as a function of the grain size and Gd composition, is discussed and compared to microcrystalline samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1122: Symposium O – Structure/Property Relationships in Fluorite-Derivative Compounds , 2008 , 1122-O06-02
Copyright
Copyright © Materials Research Society 2009

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References

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