Electronic structure of iron(II) and (III) fluorides using X-ray emission and X-ray photoelectron spectroscopies

Abstract

Iron(n) and (m) fluorides have been studied using X-ray emission (XE) and photoelectron (XP)spectroscopies. XE data enable the XP peaks to be identified unequivocally ; in the iron(m) compound the F 2p and Fe 3d orbitals were shown to have almost identical energy. The F Ka XE peak profile showed the Fe-F band to be more covalent in ferric than ferrous fluoride. Whilst the F Is binding energy was the same for both compounds a peak shift of 3.0-3.5 eV to higher binding energies was found for all iron orbitals upon oxidation. The rapid reduction of iron(m) to iron@) by argonion bombardment was observed.

Ionic liquids as an additive in fully formulated wind turbine gearbox oils

“…7), several facts happen: (a) a new layer of iron phosphate is formed, confirming the previous results obtained for P (Table 4) However, it is difficult to assign this energy, although it can be related to FeSO 4 (described at 713.6 eV [52]) or FeF 3 (described at 713.9-714.8 eV [53][54][55]). Neither S nor F could be detected in the sample.…”

Cubic Perovskite Fluoride as Open Framework Cathode for Na‐Ion Batteries

“…More evidences about the intercalation mechanism were acquired by X‐ray photoemission spectroscopy (XPS), as shown in Figure . The pristine sample shows an Fe 2p 3/2 peak at 711.4 eV, corresponding to the bonding energy of Fe(II)‐F . This peak shifts to a higher bonding energy of 713.5 eV after charging to 4.5 V, indicating the formation of Fe(III)‐F .…”

Investigation of multiplet splitting of Fe 2p XPS spectra and bonding in iron compounds

“…22 This difference in BE was attributed to an increase in covalent bond character (decrease in ionic bond character) of the Fe-F bond of FeF 3 compared with that of FeF 2 . 22 The same observation was found during this study.…”

“…22 This difference in BE was attributed to an increase in covalent bond character (decrease in ionic bond character) of the Fe-F bond of FeF 3 compared with that of FeF 2 . 22 The same observation was found during this study. To determine the degree of ionic bonding found in the various iron compounds, the difference in electronegativity between either high-spin Fe 2C or Fe 3C and the corresponding ligand was determined and then plotted against the Fe 2p 3/2 BE.…”