Two-step sintering ceria-based electrolytes
Yttrium and gadolinium-doped ceria-based electrolytes (20 at% dopant cation) with and without small Ga 2O 3-additions (0.5 mol%) were fired at peak temperatures of 1250 and 1300 °C, or following a two-step sintering profile including one peak temperature and subsequent dwell at 1150 °C, 10 h. All ma...
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Published in | International journal of hydrogen energy Vol. 35; no. 7; pp. 2737 - 2741 |
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Main Authors | , , , |
Format | Journal Article Conference Proceeding |
Language | English |
Published |
Kidlington
Elsevier Ltd
01.04.2010
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Yttrium and gadolinium-doped ceria-based electrolytes (20
at% dopant cation) with and without small Ga
2O
3-additions (0.5
mol%) were fired at peak temperatures of 1250 and 1300
°C, or following a two-step sintering profile including one peak temperature and subsequent dwell at 1150
°C, 10
h. All materials were characterized by scanning electron microscopy, X-ray diffraction and impedance spectroscopy in air, in the temperature range 200–800
°C. Average grain sizes in the range 150–250
nm and densifications up to about 94% were found dependent on the sintering profile and presence of Ga. The grain boundary arcs in the impedance spectra increased significantly with Ga-doping, cancelling the apparently positive role of Ga on bulk transport, evidenced mostly in the case of yttrium-doped materials. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0360-3199 1879-3487 |
DOI: | 10.1016/j.ijhydene.2009.04.056 |