Structural features and high-temperature transport in SrFe0.7Mo0.3O3−
| Autor: | Alexey A. Markov, Elizaveta V. Shalaeva, I. A. Leonidov, V.L. Kozhevnikov, Mikhail V. Patrakeev, O.V. Merkulov, Alexander P. Tyutyunnik |
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| Rok vydání: | 2018 |
| Předmět: |
Electron mobility
Materials science Annealing (metallurgy) Inorganic chemistry Oxide Analytical chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Oxygen Inorganic Chemistry chemistry.chemical_compound Electrical resistivity and conductivity Materials Chemistry Physical and Theoretical Chemistry Partial pressure 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry Electron diffraction Ceramics and Composites Water splitting 0210 nano-technology |
| Zdroj: | Journal of Solid State Chemistry. 258:447-452 |
| ISSN: | 0022-4596 |
| Popis: | The complex oxide SrFe0.7Mo0.3O3−δ was obtained by combustion of the organometallic precursor in air followed by annealing in an argon flow at 1350 °C, and characterized with the help of X-ray and electron diffraction methods. Oxygen nonstoichiometry and electrical conductivity data were collected in the oxygen partial pressure range from 10–19 to 0.5 atm at temperatures 750–950 °C. The as-prepared single phase oxide SrFe0.7Mo0.3O3−δ with the cubic double perovskite structure (SG Fm3m) is shown to undergo a structural transition to the tetragonal double perovskite phase (SG I4mmm) in the result of reducing treatment at p O 2 = 10−12 atm and 950 °C. The ordered phases are characterized by a strong anti-site disordering of iron and molybdenum and nearly zero long-range ordering parameter. The maximal concentration of n-type carriers is about four times larger than of p-type carriers in the studied limits of oxygen pressure and temperature. The mobility of p-type carriers is found to vary within ~ 0.02–0.03 cm2 V−1 s−1 with the migration energy of about 0.4 eV, while the n-type mobility being approximately twice higher does not practically depend on temperature. Such features as good electrical conductivity, which can rise up to 40 S cm−1 in reducing conditions and a considerable amount of oxygen vacancies favorable for fast oxygen ion transport are beneficial for application of SrFe0.7Mo0.3O3−δ as anode material in SOFCs and oxygen membrane for hydrogen generation by a water splitting. |
| Databáze: | OpenAIRE |
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