Chemical Expansion and Frozen-in Oxygen Vacancies in Pr-doped Ceria

被引：5

作者：

Kuru, Y. ^{[1
,2
]}

Bishop, S. R. ^{[1
]}

Kim, J. J. ^{[1
]}

Yildiz, B. ^{[2
]}

Tuller, H. L. ^{[1
]}

机构：

[1] MIT, Dept Mat Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[2] MIT, Dept Nucl Sci & Engn, Cambridge, MA 02139 USA

来源：

SOLID OXIDE FUEL CELLS 12 (SOFC XII) | 2011年 / 35卷 / 01期

关键词：

CE0.8GD0.2O1.9;

D O I：

10.1149/1.3570094

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Doped CeO2 is a promising candidate for solid oxide fuel cell electrolyte and electrode applications because of its high ionic conductivity and reduction/oxidation behavior at intermediate temperatures. Its electronic and ionic properties and microstructural stability are of particular interest. The present study demonstrates that the large number of oxygen vacancies created in PrxCe1-xO2-delta (PCO) at elevated temperatures can be accommodated at room temperature if cooling is performed in relatively low oxygen partial pressures (i.e. P(O-2) similar to 10(-3) mbar). We use the temperature dependence of the chemical expansion in reduced PCO as a metric to explore this phenomenon.

引用

页码：1131 / 1136

页数：6

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