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RESEARCH PRODUCT
Mössbauer Study of Lanthanum–Strontium Ferromanganite Oxides
Mustapha AbdelmoulaJ.-m. GéninGilles CabocheLouis-claude DufourMarie Petitjeansubject
Nuclear and High Energy PhysicsInorganic chemistryOxidechemistry.chemical_elementDisproportionation02 engineering and technologyManganese010402 general chemistry01 natural sciences7. Clean energychemistry.chemical_compoundOxidation stateRedox titrationMössbauer spectroscopyLanthanum[CHIM]Chemical SciencesPhysical and Theoretical ChemistryComputingMilieux_MISCELLANEOUSValence (chemistry)021001 nanoscience & nanotechnologyCondensed Matter PhysicsAtomic and Molecular Physics and Optics0104 chemical scienceschemistry13. Climate action0210 nano-technologydescription
The La0.88Sr0.2Mn(1−y)Fey0(3±δ, i (LSMF with y = 0, 0.2, 0.5, 0.8, 1) compounds are prospective cathode materials for advanced solid oxide fuel cells (SOFC) application operating at 700° C. Usual analysis methods like thermogravimetric analysis or redox titration enable to determine the average oxidation state of both manganese and iron cations. The comparative role of iron and manganese in B-site was evaluated by 57Fe Mossbauer spectroscopy. Spectra revealed that the complete substitution of iron for manganese induces the formation of Fe5+ for the compound with y = 1. However, no tetravalent iron cation was observed in air for the LSMF compounds with y = 0.2, 0.5 and 0.8. This means that only manganese cations are electronically active in the bulk with valence states Mn3+ and Mn4+. Then, when the iron content increases, the concentration in oxygen vacancies increases also facilitating anionic diffusion. The charge disproportionation Fe3+/Fe5+ can improve the electrical properties for the compound with y = 1.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2004-01-01 |