Investigations into the structure of La3Ni2–xFexO7±δ
| Autor: | Armin Feldhoff, Piotr Gaczynski, Klaus-Dieter Becker, Vladimir A. Cherepanov, E.A. Kiselev, Götz Eckold |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
crystal structure
Materials science RIETVELD REFINEMENT General Chemical Engineering La3Ni2O7 complex oxides Ruddlesden-Popper phases Mössbauer spectroscopy Patterson analysis Rietveld refinement Oxide 02 engineering and technology Crystal structure 010402 general chemistry 01 natural sciences Ion CRYSTAL STRUCTURE PATTERSON ANALYSIS chemistry.chemical_compound ruddlesden-popper phases Materials Chemistry la3ni2o7 patterson analysis QD1-999 COMPLEX OXIDES MOSSBAUER SPECTROSCOPY Space group General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Chemistry Crystallography RUDDLESDEN-POPPER PHASES Octahedron chemistry LA3NI2O7 rietveld refinement 0210 nano-technology mössbauer spectroscopy Solid solution |
| Zdroj: | Chimica Techno Acta; Том 6, № 2 (2019); 51-71 Chimica Techno Acta, Vol 6, Iss 2, Pp 51-71 (2019) |
| ISSN: | 2411-1414 |
| Popis: | Received: 15.07.2019. Accepted: 01.08.2019. Published: 05.08.2019. The room-temperature (RT) 57Fe Mössbauer spectra of the La3Ni2–xFexO7±δ oxide solid solutions of Ruddlesden-Popper-type (x = 0.05, 0.10) reveal two doublets for Fe3+ ions in octahedral coordination by oxygen. The existence of two inequivalent sites for Fe at RT is at variance with the space groups Fmmm and Cmcm (Amam) which have been reported for La3Ni2O7±δ. This unexpected finding is discussed in connection with Patterson analyses and Rietveld refinements of powder XRD data for x = 0, 0.05, and 0.10. Alternative structural models have been proposed which can explain the spectroscopic findings and which are compatible with the results from X‑ray diffraction. K.-D.B. and P.G. would like to thank the Volkswagen-Foundation and the State of Lower Saxony (Germany) for financial support of the present work. E.K. and V.C. acknowledge support of their work by the Ministry of Education and Science of the Russian Federation. A.F. is grateful to the Deutsche Forschungsgemeinschaft (DFG) for financial support in the frame of grant FE928/7–1. Thanks are also due to Prof. Th. Gesing (U Bremen, Germany) for chemical EDX analyses of samples. E.K and V. Ch. work was supported by Act 211 Government of the Russian Federation, agreement 02.A03.21.0006. |
| Databáze: | OpenAIRE |
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