期刊
CERAMICS INTERNATIONAL
卷 39, 期 1, 页码 307-313出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2012.06.026
关键词
Ionic conductivity; Perovskites; Fuel cells
资金
- Ministry of Education and Science of the Republic of Serbia [III45007]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo-FAPESP [2010/20574-3]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [10/20574-3] Funding Source: FAPESP
BaCe0.9-xNbxY0.1O3-delta (where x=0, 0.01, 0.03 and 0.05) powders were synthesized by solid-state reaction to investigate the influence of Nb concentration on chemical stability and electrical properties of the sintered samples. The dense electrolyte pellets were formed from the powders after being uniaxially pressed and sintered at 1550 degrees C. The electrical conductivities determined by impedance measurements in temperature range of 550-750 degrees C in different atmospheres (dry argon and wet hydrogen) showed a decreasing trend with an increase of Nb content. For all samples higher conductivities were observed in the wet hydrogen than in dry argon atmosphere. The chemical stability was enhanced with increasing of Nb concentration. It was found that BaCe0.87Nb0.03Y0.1O3-delta is the optimal composition that satisfies the opposite demands for electrical conductivity and chemical stability, reaching 0.8 x 10(-2) S cm(-1) in wet hydrogen at 650 degrees C compared to 1.01 x 10(-2) S cm(-1) for undoped electrolyte. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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