Electronic states and structural characterization in single-crystal Fe–Ni–O alloy thin films grown by molecular beam epitaxy

X-ray Photoelectron and Absorption Spectroscopy of Metal-Rich Phosphides M2P and M3P (M = Cr−Ni)

“…Moreover, the intensity of these edges should reflect the charge on the Ni atoms, but line broadening in different compounds can be influenced by changes in site symmetry, rendering an intensity analysis somewhat problematic. 54 Qualitatively, however, there does appear to be an increase in the L-edge peak areas on progressing from Ni metal to Ni 3 P and Ni 2 P (Figure 8a), implying more unoccupied Ni-based conduction states and lending support to the presence of cationic Ni in these compounds.…”

“…In principle, the line shape of the L 3 -edge reveals information about the coordination environment of the Ni atoms (because unoccupied 3d states are being probed), but its interpretation is hampered by the fact that these environments differ substantially in Ni 2 P vs Ni 3 P (Figure ). Moreover, the intensity of these edges should reflect the charge on the Ni atoms, but line broadening in different compounds can be influenced by changes in site symmetry, rendering an intensity analysis somewhat problematic . Qualitatively, however, there does appear to be an increase in the L-edge peak areas on progressing from Ni metal to Ni 3 P and Ni 2 P (Figure a), implying more unoccupied Ni-based conduction states and lending support to the presence of cationic Ni in these compounds.…”

Epitaxial Stabilization of Oxides in Thin Films

“…In particular, both Fe 3 O 4 and NiO (rock salt structure) can grow epitaxially on MgO, but the former phase provides a better lattice match to the substrate. Respectively, in Fe 3 O 4 −NiO thin films the single-phase spinel is stable up to higher nickel content, as compared to the bulk state . Moreover, it was found that a nickel−iron distribution between tetrahedral and octahedral positions of the epitaxial films (a degree of the spinel inversion) differs from that of the bulk material with the same Ni content …”

X-ray absorption spectroscopy of Mg doped Fe3O4 thin films

“…properties in this series of samples must be related to their crystal structure and to the ratio of cations Fe/Mg. It was demonstrated that the XANES method is a powerful tool for the study of structural and electronic properties of mixed oxide systems [5,6]. In this article we report the cation distribution and valence states of Fe 1−x Mg x O y thin films based on XANES measurements at magnesium, oxygen and iron K-edges.…”