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 24.02.2009   Карта сайта     Language По-русски По-английски
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24.02.2009

Tuneability of Sm(1 − x)CexFeO3 ± λ perovskites: Thermal stability and electrical conductivity






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






aCentre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5






Received 5 August 2008; 


revised 26 October 2008; 


accepted 1 December 2008. 


Available online 21 January 2009.






Abstract


Trimetallic perovskite oxides, Sm(1 − x)CexFeO3 ± λ (x = 0–0.05), were prepared by thermal decomposition of amorphous citrate precursors followed by calcinations. The material properties of the substituted perovskites were characterized by X-ray diffraction (XRD), X-ray florescence spectroscopy (XRF), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The doped materials exhibited a single perovskite phase in air up to 1350 °C and have specific surface areas in the range of 2.696–8.665 m2/g. In reducing atmosphere (5%v/vH2/N2), the unsubstituted perovskite (x = 0) decomposed into two phases while the ceria stabilized materials (x = 0.01, x = 0.03, x = 0.05) remained in a single phase as revealed by XRD analysis. Their conductivities were measured by the four point probe method in air and in dilute hydrogen (5%v/vH2/N2) separately. The ceria substituted materials show increased stability versus reduction and phase separation for a wide temperature range (up to 1000 °C). Although undoped SmFeO3 has higher conductivity under oxidizing conditions than ceria doped SmFeO3 due its p-type nature, the situation is reversed under reducing conditions. The ceria substituted perovskites (Sm(1 − x)CexFeO3 ± λ, x = 0–0.05) showed higher conductivity in reducing than in oxidizing conditions, suggesting that ceria doping at the A-site has changed the SmFeO3 from p-type to n-type semi-conducting behavior.





Keywords: Perovskite; Ceria doping; Samaria; Iron oxide; Thermal stability; Electrical conductivity; XPS





Article Outline



1. Introduction
2. Experimental procedure

2.1. Synthesis
2.2. Characterization

3. Results and discussion

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

4. Conclusions
References




















































Corresponding Author Contact InformationCorresponding author. Tel.: +1 613 562 5800x6037; fax: +1 613 562 5170.










Solid State Ionics
Volume 180, Issues 2-3, 9 March 2009, Pages 198-204


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