Structural Features, Nonstoichiometry and High-Temperature Transport in SrFe1-xMoxO3-δ Full article
Journal |
Journal of Solid State Chemistry
ISSN: 0022-4596 , E-ISSN: 1095-726X |
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Output data | Year: 2009, Volume: 182, Number: 4, Pages: 799-806 Pages count : 8 DOI: 10.1016/j.jssc.2008.12.026 | ||||||
Tags | Brownmillerite, Electron mobility, Ion conductivity, Mixed conductivity, Oxygen nonstoichiometry, Perovskite, Strontium ferrite | ||||||
Authors |
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Affiliations |
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Funding (3)
1 | Russian Foundation for Basic Research | 05-03-08109 |
2 | Russian Foundation for Basic Research | 06-03-33099 |
3 | Ural Branch of the Russian Academy of Sciences | 7-1K |
Abstract:
The oxide solid solutions SrFe1−xMoxO3−δ, where x=0.05, 0.1 and 0.2, are studied in this work. It is shown that substitution of iron for molybdenum results in stabilization of a cubic quasi-perovskite locally inhomogeneous structure, which is evidenced by HREM and Mössbauer spectroscopy. The coulometric titration is used in order to determine changes of oxygen nonstoichiometry in the obtained solutions with temperature and ambient oxygen partial pressure. Partial molar thermodynamic functions of the labile oxygen are calculated from the measured data. The variations of partial molar entropy with oxygen content follow the ideal gas model reasonably well thus demonstrating approximately random distribution of oxygen vacancies in the doped ferrite at high temperatures. The partial molar enthalpy is found to increase with doping, which is indicative of a progressive decrease in average values of the bonding energy of labile oxygen ions. The measurements of total conductivity are used in order to determine partial contributions of charge carriers. The oxygen ion component is shown to increase at small level of doping, x=0.05 while further increase in molybdenum content is accompanied with the decline in the ion conductivity. The electron contribution in reducing conditions tends to increase with molybdenum content, which is interpreted as a manifestation of involvement of Mo5+ cations in electron transport. Concentration and mobility of electron carriers are calculated. Some increase in mobility of electron holes at small doping is explained as related to the filling of oxygen vacancies.
Cite:
Markov A.A.
, Savinskaya O.A.
, Patrakeev M.V.
, Nemudry A.
, Leonidov I.A.
, Pavlyukhin Y.T.
, Ishchenko A.V.
, Kozhevnikov V.L.
Structural Features, Nonstoichiometry and High-Temperature Transport in SrFe1-xMoxO3-δ
Journal of Solid State Chemistry. 2009. V.182. N4. P.799-806. DOI: 10.1016/j.jssc.2008.12.026 WOS Scopus РИНЦ
Structural Features, Nonstoichiometry and High-Temperature Transport in SrFe1-xMoxO3-δ
Journal of Solid State Chemistry. 2009. V.182. N4. P.799-806. DOI: 10.1016/j.jssc.2008.12.026 WOS Scopus РИНЦ
Dates:
Submitted: | Oct 9, 2008 |
Accepted: | Dec 31, 2008 |
Published online: | Jan 6, 2009 |
Published print: | Apr 1, 2009 |
Identifiers:
Web of science | WOS:000265122500019 |
Scopus | 2-s2.0-62849090909 |
Elibrary | 13614914 |
Chemical Abstracts | 2009:376008 |
Chemical Abstracts (print) | 150:577879 |
OpenAlex | W1525657833 |