Electronic-structure study of Ni<SUB>81</SUB>Cr<SUB>15</SUB>B<SUB>4</SUB> metallic glass using photoemission spectroscopy

X-ray- and ultraviolet-photoelectron spectroscopic studies of the core levels and the valence band of amorphous and crystalline (annealed at 800 K) Ni81Cr15B4 metallic glass are presented, and a comparison has been made of the valence-band spectra with those of the constituent elements. The single broad band appearing in the vicinity of the Fermi level in the spectrum of amorphous Ni81Cr15B4 is attributed to the d-band combination of both nickel and chromium. The low-lying states arise due to hybridization of metal-metalloid levels. The Ni3B phase has been detected in crystalline Ni81Cr15B4. The binding energy changes in the Ni 2p3/2, Cr 2p3/2, and B 1s levels, the variation of the Ni 2p3/2 satellite intensity, and asymmetry-index changes for the core lines have been used to support the above picture as well as to arrive at a comprehensive understanding of the density-of-states variation at the Fermi level. The charge-transfer mechanism between constituent elements in metallic glasses is also discussed

Photoelectron spectroscopic studies of the interface reactions between lead and the high-T<SUB>c</SUB> Bi<SUB>2</SUB>Sr<SUB>2</SUB>CaCu<SUB>2</SUB>O<SUB>8</SUB> superconductor

Interface characteristics between Pb and the Bi2Sr2CaCu2O8 oxide superconductor were studied by X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). The core level results show the partial conversion of CU2+ to the Cu1+ state. Pb adatoms extract oxygen from the substrate, by disturbing Bi-O, Sr-O and Cu-O bonds and form an orthorhombic oxide. The interfacial reaction is compared within 40 &#197; thickness

X-ray-photoelectron-spectroscopy study of the electronic structure of Ni-P metallic glasses

X-ray-photoelectron-spectroscopy studies of the core levels and the valence band for Ni79P21 and Ni89P11 glassy alloys are presented at room temperature and above their crystallization temperatures. The binding energy changes in Ni 2p3/2 and P 2p core-level lines and the variation in the satellite intensities as well as the changes in their asymmetry index are combined with Ni valence-band spectra and their satellite intensities to arrive at a comprehensive electronic structure for these alloys. The observed increase and decrease in the density of states at EF for Ni89P11 and Ni79P21 are discussed with reference to the short-range stability and glass-forming ability