Oxygen-ion and electron conductivity in Sr2(Fe1−xGax)2O5
| Autor: | Mikhail V. Patrakeev, Kenneth R. Poeppelmeier, V.L. Kozhevnikov, J. A. Bahteeva, I. A. Leonidov, D. S. Filimonov, K. V. Poholok |
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| Rok vydání: | 2006 |
| Předmět: |
Mössbauer effect
Chemistry Analytical chemistry chemistry.chemical_element engineering.material Conductivity Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry Electrical resistivity and conductivity X-ray crystallography Mössbauer spectroscopy Materials Chemistry Ceramics and Composites engineering Brownmillerite Orthorhombic crystal system Physical and Theoretical Chemistry Gallium Nuclear chemistry |
| Zdroj: | Journal of Solid State Chemistry. 179:3045-3051 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2006.05.028 |
| Popis: | High-temperature electrical conductivity measurements, structural data from powder X-ray diffraction and {sup 57}Fe Mossbauer spectroscopy were combined to study the interrelationship of oxygen ion transport and p- and n-type transport in Sr{sub 2}(Fe{sub 1-x}Ga{sub x}){sub 2}O{sub 5}, where x=0, 0.1 and 0.2. Although gallium substitution generally decreases the total ion-electron transport, the transition of the orthorhombic brownmillerite structure to a cubic phase on heating results in the recurrence of the conductivity to the same high level as in the parent ferrite (x=0). The changes of the partial contributions to the total conductivity as a function of x are shown to reflect a complicated interplay of the disordering processes that develop in the oxygen sublattice on heating in response to replacement of iron with gallium. |
| Databáze: | OpenAIRE |
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