Fluorination of perovskite-related phases of composition La1−xSrxFe1−yCoyO3−δ

Berry, Frank J.; Ren, Xiaolin; Heap, Richard; Slater, Peter and Thomas, Michael F. (2008). Fluorination of perovskite-related phases of composition La1−xSrxFe1−yCoyO3−δ. Journal of Physics and Chemistry of Solids, 69(8) pp. 2032–2036.

DOI: https://doi.org/10.1016/j.jpcs.2008.02.018

Abstract

We report here on the fluorination of the perovskite-related phases La1xSrxFe1yCoyO3d. The
introduction of fluorine in place of oxygen is achieved through a low-temperature (400 1C) reaction
with poly(vinylidene fluoride). X-ray powder diffraction data show that in all cases the fluorination
leads to an expansion in the unit cell, which is consistent with partial replacement of oxygen by fluorine
and consequent reduction in the oxidation state of iron and/or cobalt. This reduction in oxidation state
is confirmed by X-ray absorption- and Mo¨ ssbauer-spectroscopy. The Mo¨ ssbauer spectra show complex
magnetically split hyperfine patterns for the fluorinated samples, reflecting the interactions between
Fe3+ ions, which are not possible in oxides containing Fe4+.

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