Alloying effects on x-ray absorption edges in nickel-platinum single crystals

Investigation of the Platinum Cluster Size and Location on Zeolite KL with 129Xe NMR, XAFS, and Xenon Adsorption

“…Sachtler and co-workers 34 have suggested that small Pt clusters supported on zeolite Y can be partially oxidized by zeolite protons upon desorption of dihydrogen due to a shift in the following equilibrium: Pt 0 + 2L‚‚‚H + f 2L‚‚‚Pt 2+ + H 2 v. It is expected that changes in the oxidation state for the Pt cluster can be reflected in the X-ray absorption near edge structure (XANES), following the XANES analysis method reported by Moraweck et al 35 Moraweck et al showed that the Pt XANES changed at both the Pt L III and L II edges upon alloying Pt with Ni. The allowed transitions corresponding to the Pt L III XANES are 2p 3/2 f 5d 3/2 and 5d 5/2 , while the transition for the Pt L II XANES is 2p 1/2 f 5d 3/2 .…”

Structural and magnetic properties of amorphous Co-W alloyed nanoparticles

“…The origin of peak I is at the density of states (DOS) of d character available at the Fermi energy, projected onto the Co site. 48,49 This is influenced by intra-atomic Co 4p-3d hybridization. Moreover, in our samples, this d DOS originates both at the Co 3d band and at the W 5d states through interatomic Co 3d-W 5d hybridization.…”

Magnetic nanoparticles studied by synchroton radiation and rf transverse susceptibility

“…Changes in the intensity of the pre-edge peak and the white line (denoted as peak I and peak II, respectively, in The Co K edge white line reflects its 4p empty states near the Fermi energy. The origin of peak I is at the density of states (DOS) of d −character available at the Fermi energy, projected onto the Co site [98,99]. This is influenced by intra-atomic Co 4p − 3d hybridization, as it will be further described in section 3.1.1.…”