Spectroscopic fingerprints of valence and spin states in manganese oxides and fluorides
By R. Qiao, T. Chin, Stephen Harris, Shishen Yan, Wanli Yang. 2012
182 citations recorded by the source corpus.
Abstract We performed a systematic study of soft X-ray absorption spectroscopy in various manganese oxides and fluorides. Both Mn L -edges and ligand (O and F) K -edges are presented and compared with each other. Despite the distinct crystal structure and covalent/ionic nature in different systems, the Mn- L spectra fingerprint the Mn valence and spin states through spectral lineshape and energy position consistently and evidently. The clear O- and F- K pre-edge features in our high resolution spectra enable a quantitative definition of the molecular orbital diagram with different Mn valence. In addition, while the binding energy difference of the O-1 s core electrons leads to a small shift of the O- K leading edges between trivalent and quadrivalent manganese oxides, a significant edge shift, with an order of magnitude larger in energy, was found between divalent and trivalent compounds, which is attributed to the spin exchange stabilization of half-filled 3 d system. This shift is much enhanced in the ionic fluoride system. This work provides the spectroscopic foundation for further studies of complicated Mn compounds.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Inorganic Chemistry
View Paper: https://www.semanticscholar.org/paper/c6dc3432c1c2afc658afcf8b64eb35cbbb11196c
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In Electronic, Optical and Magnetic Materials
Citations in the corpus
- Direct Experimental Probe of the Ni(II)/Ni(III)/Ni(IV) Redox Evolution in LiNi0.5Mn1.5O4 Electrodes (2015, methodology): “The cathode samples were then loaded into the ultra-high vacuum sXAS characterization chamber through a sample transfer kit to avoid any air exposure.(16)”
- Chemical Aspects of the Candidate Antiferromagnetic Topological Insulator MnBi2Te4 (2018, background): “[45,46] Similarly, the XPS line shapes of the Mn 2p levels (Figure 3) resemble spectra of Mn compounds in which Mn is divalent.”