Study on Coloration Mechanism of Chinese Ancient Ceramics by X-ray Absorption Near-edge Structure

Unveiling the Genesis and Effectiveness of Negative Fading in Nanostructured Iron Oxide Anode Materials for Lithium-Ion Batteries

“…However, after the 2FD state, a clear Fe metal phase was identified both in the XANES and EXAFS profiles, indicating the conversion reaction was promoted by the active sites significantly generated in the mesoporous structure. After the first cycle, only the Fe–O coordination shell was recovered, whereas the Fe–Fe coordination shell was not recovered in accordance with the highly defective oxide observed after cycling. ,− In the XANES spectra of the 1FC and 2FC states of the meso-Fe 2 O 3 electrode, the typical pre-edge peak of Fe 3+ at 7114.5 eV was monitored, identical to that of Fe 2 O 3 in the pristine state. − However, the intensity of pre-edge increased after the first cycle, indicating the changes of local symmetry. About the local geometry transition, the position of the white line at 7132.2 eV and the additional peak at 7147.6 eV suggests the possibility of the existence of FeOOH (Fe 3+ ) phase. , And the tetrahedral character in ferrihydrite demonstrates the reason for the local symmetry change as observed in the pre-edge spectra .…”

The compositional characterization and coloring mechanism of Tianqing porcelain from the Huangpu kiln based on EDXRF, SEM, and XAFS analyses

“…4, the absorption edge shifts to higher energy as the valence state of the absorber atom in the sample increases. 14 The pre-edge peak and the absorption edge energy of magnetite (Fe 2+ , Fe 3+ ) are located at a lower position than those in compounds containing trivalent iron. Iron oxides exhibit a small pre-edge peak on the lower-energy side of the absorption edge, corresponding to transitions from 1s to 3d levels.…”

“…The pre-edge peak also shifts to higher energy with increasing valence state of the absorber atom. 14–16…”