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Media type:
E-Article
Title:
X-ray diffraction and electron parametric resonance investigations on the fluorite material Y0.25Ti0.15Zr0.6O2-x
Contributor:
Tietz, F.
[Author];
Jungen, W.
[Author];
Lersch, K. P.
[Author];
Figaj, M.
[Author];
Becker, K. D.
[Author];
Skarmoutsos, D.
[Author]
Published:
American Chemical Society, 2002
Published in:Chemistry of materials 14, 2252 - 2257 (2002). doi:10.1021/cm011252h
Language:
English
DOI:
https://doi.org/10.1021/cm011252h
ISSN:
0897-4756
Keywords:
Origination:
Footnote:
Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
Description:
The compound Y0.25Ti0.15Zr0.6O2-x, to be used as an anode material in solid oxide fuel cells, was synthesized by coprecipitation. X-ray diffraction after sintering at different temperatures revealed no single-phase material up to 1500 degreesC but indicated two fluorites with different lattice parameters. The inhomogeneity of the material arose from a cation demixing process around 1100-1200 degreesC, leading to an intermediate fraction of a pyrochlore phase. After reduction in Ar/4% H-2 at 1000 degreesC, a small decrease (about 0.1%) in the lattice parameter was observed. The electron paramagnetic resonance measurements on reduced samples showed the occurrence of Ti3+ ions in at least two sites. Possible reasons for the decrease of the lattice parameter after reduction are discussed.