Influence of crystal structure, ligand environment and morphology on Co L-edge XAS spectral characteristics in cobalt compounds

• The electronic structure of a material plays an important role in its functionality for different applications which can be probed using synchrotron-based spectroscopy techniques. Here, various cobalt-based compounds, differing in crystal structure, ligands surrounding the central metal ion and morphology, have been studied by soft X-ray absorption spectroscopy (XAS) at the Co L-edge in order to measure the effect of these parameters on the electronic structure. A careful qualitative analysis of the spectral branching ratio and relative intensities of the L 3 and L 2 peaks provide useful insight into the electronic properties of compounds such as CoO/Co(OH)2, CoCl2.6H2O/CoF2.4H2O, CoCl2/CoF2, Co3O4 (bulk/nano/micro). For further detailed analysis of the XAS spectra, quantitative analysis has been performed by fitting the spectral profile with simulated spectra for a number of cobalt compounds using crystal field atomic multiplet calculations.

Ämnesord

NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Nyckelord

branching ratio

cobalt L-edge

I(L3)/I(L2) ratio

NEXAFS

site symmetry

Cobalt

Cobalt compounds

Electronic properties

Electronic structure

Ligands

Metal ions

Metals

X ray absorption spectroscopy

Qualitative analysis

Relative intensity

Simulated spectra

Soft x-ray absorption spectroscopies

Spectral characteristics

Crystal structure

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