Production of high conductivity composite zirconia solid oxide electrolytes with good mechanical strength through net-shape

Yttria- and scandia-doped zirconia composite solid electrolytes were prepared by impregnation of a porous tetragonal 3 mol% Y2O3 zirconia matrix with a solution of scandium nitrate in a net-shape type process. The resulting composite exhibited both high conductivity (0.01 S cm-1at 903 K) and good me...

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Bibliographic Details
Published in:Journal of materials chemistry 2008-01, Vol.18 (43), p.5237-5242
Main Authors: GHATEE, Mojtaba, MOHAMMAD HOSSAIN SHARIAT, IRVINE, John
Format: Article
Language:English
Subjects:
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
Properties of electrolytes: conductivity
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Summary:Yttria- and scandia-doped zirconia composite solid electrolytes were prepared by impregnation of a porous tetragonal 3 mol% Y2O3 zirconia matrix with a solution of scandium nitrate in a net-shape type process. The resulting composite exhibited both high conductivity (0.01 S cm-1at 903 K) and good mechanical strength and fracture toughness. This excellent performance can be attributed to the achievement of a favourable inhomogeneous structure of the core-shell type. Grain surfaces are enriched with scandia dopant to improve both crystal and grain boundary conductivities with formation of cubic zirconia at these interfaces, whilst retaining the small grain size of the tetragonal phase, which optimises mechanical properties and favours production of thin electrolytes.
ISSN:0959-9428
1364-5501
DOI:10.1039/b811486b