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Title: Investigations into the structure of La3Ni2–xFexO7±δ
Authors: Kiselev, E. A.
Gaczynski, P.
Eckold, G.
Feldhoff, A.
Becker, K.-D.
Cherepanov, V. A.
Issue Date: 2019
Publisher: Уральский федеральный университет
Citation: Investigations into the structure of La3Ni2–xFexO7±δ / E. A. Kiselev, P. Gaczynski, G. Eckold, A. Feldhoff, K.-D. Becker, V. A. Cherepanov // Chimica Techno Acta. — 2019. — Vol. 6, No. 2. — P. 51–71.
Abstract: 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.
Keywords: LA3NI2O7
ISSN: 2409-5613 (Print)
2411-1414 (Online)
DOI: 10.15826/chimtech.2019.6.2.03
metadata.dc.description.sponsorship: 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.
Origin: Chimica Techno Acta. 2019. Vol. 6. № 2
Appears in Collections:Chimica Techno Acta

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