Investigations into the structure of La 3 Ni 2−x Fe x O 7±δ

Evgeny Alexandrovich Kiselev; Piotr Gaczynski; Götz Eckold; Armin Feldhoff; Klaus-Dieter Becker; Vladimir Alexandrovich Cherepanov

doi:10.15826/chimtech.2019.6.2.03

Investigations into the structure of La₃Ni_2−xFe_xO_7±δ

Evgeny Alexandrovich Kiselev, Piotr Gaczynski, Götz Eckold, Armin Feldhoff, Klaus-Dieter Becker, Vladimir Alexandrovich Cherepanov

Abstract

The room-temperature (RT) ⁵⁷Fe Mössbauer spectra of the La₃Ni_2−xFe_xO_7±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 La₃Ni₂O_7±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; complex oxides; Ruddlesden-Popper phases; Mössbauer spectroscopy; crystal structure; Patterson analysis; Rietveld refinement

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References

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DOI: https://doi.org/10.15826/chimtech.2019.6.2.03

Copyright (c) 2019 Evgeny Alexandrovich Kiselev, Piotr Gaczynski, Götz Eckold, Armin Feldhoff, Klaus-Dieter Becker, Vladimir Alexandrovich Cherepanov