Zn as sintering aid for ceria-based electrolytes
Gd-doped ceria (CGO) nanopowders were mixed with up to 1mol% of Zn (as nitrate) to exploit the role of this dopant on sintering and electrical performance. All samples were prepared by two-step sintering schedules to try to combine the advantages of both effects on low-temperature densification. Str...
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Published in | Solid state ionics Vol. 262; pp. 522 - 525 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.09.2014
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Subjects | |
Online Access | Get full text |
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Summary: | Gd-doped ceria (CGO) nanopowders were mixed with up to 1mol% of Zn (as nitrate) to exploit the role of this dopant on sintering and electrical performance. All samples were prepared by two-step sintering schedules to try to combine the advantages of both effects on low-temperature densification. Structural and microstructural analyses were complemented with impedance spectroscopy (wide range of temperatures and oxygen partial pressures) and ion-blocking measurements. The combination of all data suggests that Zn is preferentially located in the grain boundary region, playing a significant role on sintering. Zn additions (1mol%) allowed for a 100°C lower sintering temperature with respect to pure CGO. A marginal effect on the oxide-ion conductivity and a small enhancement (less than 20%) in n-type electronic conductivity was found between Zn-free and 1mol% Zn-doped CGO. The removal of Zn from CGO after sintering is discussed.
•The densification of CGO to 96.6% at 1200°C with only 1mol% Zn as sintering aid was studied.•Zn has modest effect on the ionic and electronic conductivity of CGO.•Electrical properties deviate from classical bulk behavior models.•Grain boundaries play a relevant role on sintering and electrical performance.•The post-sintering removal of Zn from CGO was discussed. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0167-2738 1872-7689 |
DOI: | 10.1016/j.ssi.2013.11.002 |