Quadrupolar transitions and medium-range-order effects in metalK-edge x-ray absorption spectra of3dtransition-metal compounds

Interpretation of the Ni K-edge EXAFS in nanocrystalline nickel oxide using molecular dynamics simulations

“…1) was assigned to the quadrupole 1s→3d transition from the analysis of resonant x-ray magnetic scattering in [27]. Its quadrupole origin was also supported by several theoretical calculations [29,31,32].…”

“…The preedge region of the XANES provides with the information on the local electronic structure at the absorbing Ni atoms in the presence of the core-hole. In particular, the Ni K-edge absorption is caused by the transition of a 1s electron of nickel from its The interpretation of the Ni K-edge XANES in NiO has been a topic of extensive studies in the past [26,27,28,29,30,31,32,33]. The use of the multiple-scattering approach allowed understanding the origin of main peaks to be due to the scattering by atoms of the first ten coordination shells surrounding the absorber [26,30].…”

XAFS studies of the short-range order in Ni nanoparticles embedded in carbonacoues matrix

“…They are widely described features of transition metal absorption spectra (e.g. [7][8][9][10][11]). The Ni K edge position in the energy scale was chosen as the coordinate of the first inflection point associated with the pre-edge bump.…”

Effect of annealing on the structural role of Fe in composite Fe- and Zn-rich materials: A XAFS study

“…The Lorentzian at 7113.0 eV represents Fe 3+ in tetrahedral sites while the one at 7113.4-7113.6 eV corresponds to Fe 3+ in octahedral sites [9][10][11]. The last peak at 7116.2-7116.8 eV is attributed to the clustering of Fe in octahedral complexes [21] and its contribution is not discussed any further. Thus, according to the NEXAFS analysis, only Fe 3+ are detected and in agreement with the EXAFS analysis The compositional changes also affect the area under the preedge peak of the glassy samples.…”