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15.03.2010


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Solid State Ionics
Volume 181, Issues 8-10, 29 March 2010, Pages 392-401













doi:10.1016/j.ssi.2010.01.017 | How to Cite or Link Using DOI
Copyright © 2010 Elsevier B.V. All rights reserved.
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Effect of cobalt substitution on thermal stability and electrical conductivity of Sm0.95Ce0.05FeO3  δ in oxidizing and reducing conditions





Syed M. Bukharia and Javier B. GiorgiCorresponding Author Contact Information, a, E-mail The Corresponding Author






a Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, 10 Marie Curie Prvt., Ottawa, Ontario, Canada K1N 6N5





Received 19 May 2009; 


revised 19 November 2009; 


accepted 15 January 2010. 


Available online 9 February 2010.







Abstract


A series of cobalt doped Sm0.95Ce0.05FeO3  δ perovskites with formula Sm0.95Ce0.05Fe1  xCoxO3  δ (x = 0–0.10) were prepared by thermal decomposition of amorphous citrate precursors followed by calcination at 850 °C in air for 24 h. These materials are stable in air even at 1350 °C and under reducing conditions (5% v/v H2/N2) up to not, vert, similar 800 °C, when phase separation ensues. Their conductivities were measured both in air and H2/N2 by the four point probe method from 25 °C to 1000 °C. The electrical conductivities increased from x = 0 to x = 0.10 in air with an increase in both temperature and cobalt concentration but in H2/N2 the trend is non-linear. The higher conductivity in air is due to oxygen vacancies created as a result of cobalt doping. Improved conductivity of Sm0.95Ce0.05Fe1  xCoxO3  δ in 5%v/v H2/N2 as compared to air is as high as two orders of magnitude. The specific species responsible for the sensing behavior (conductivity changes) is unclear, but the surface analysis by XPS showed that all these materials have a samarium rich surface. The potential sensing ability of these materials toward reducing atmospheres was probed with variable concentrations of H2/N2 gas. A linear and reversible response was observed with high sensitivity at room temperature.






Keywords: Perovskite; Thermal stability; Environmental stability; Samarium iron oxide; Ce dopant; Co dopant; Conductivity; Sensitivity; H2 sensor





Article Outline



1. Introduction
2. Experimental procedure

2.1. Synthesis
2.2. Characterization

3. Results and discussions

3.1. Bulk structure
3.2. Surface structure
3.3. Electrical conductivity

4. Conclusions
References


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  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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