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Investigations into the structure of La3Ni2−xFexO7±δ

The room-temperature (RT) 57 Fe Mossbauer spectra of the La 3 Ni 2− x Fe x O 7± δ oxide solid solutions of Ruddlesden-Popper-type ( x = 0.05, 0.10) reveal two doublets for Fe 3+ 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 La 3 Ni 2 O 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.