Photoemission (XPS, UPS) studies of Pd-Si metallic glasses

Oelhafen, P.; Liard, Maxime; Güntherodt, H.‐J.; Berresheim, K.; Polaschegg, Hans D.

doi:10.1016/0038-1098(79)90113-3

Cited by 57 publications

(4 citation statements)

References 8 publications

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“…248 While not often a requirement for pure metals, the enhanced resolution allows for more detailed analysis of composite materials where determination of orbital characteristics in the DOS may be more complicated. 249 There are a number of terms which are vital to understanding molecular electronics including, but not limited to: the vacuum level (E VAC -the energy level at which an electron is at rest a few nm outside of the atom), the Fermi energy (E F -in metals this is the boundary between occupied and unoccupied states in the continuum, in semiconductors this is a statistical state within the band gap) and work function (the energy required to take an electron from E F to E VAC ). 250 Understanding the work function is key to improving our knowledge of semiconductors and developing improved materials.…”

Section: Electronic Structurementioning

confidence: 99%

Advanced XPS characterization: XPS-based multi-technique analyses for comprehensive understanding of functional materials

Isaacs

Davies-Jones

Davies

et al. 2021

Mater. Chem. Front.

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Section: Electronic Structurementioning

confidence: 99%

Advanced XPS characterization: XPS-based multi-technique analyses for comprehensive understanding of functional materials

Isaacs

Davies-Jones

Davies

et al. 2021

Mater. Chem. Front.

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“…The situation in the case of the Pd-Si alloy alone is different. The DOS a t E , in the Pd-Xi alloy i s lower than in Pd metal and remains unchanged for different Si concentrations [6]. This change can be attributed to the filling of the Pd VB by the conduction electrons of Si, which results in a shift of the Pd d-band to higher BE [4].…”

Section: Discussionmentioning

confidence: 95%

Photoemission Studies of Pd_80−xSi₂₀Co_x Amorphous Alloys

Hricovíni¹,

Mikušík²,

Krempaský³

1983

Physica Status Solidi (b)

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(a) X-ray and W photoemission measurements of the core levels and valence bands of Pdso -,Si,,Co, amorphous alloys are reported. XPS spectra show a broadening of the cobalt 2p-levels in the alloys while the binding energies are the same as in the polycrystalline Co. The behaviour of Co atoms during the alloying process is discussed. UPS spectra of the valence bands show a shift of Pd 4d-band to higher binding energies and a cobalt contribution to the density of states above the Fermi level of Pd-Si alloy.Nous prksentons les mesures de photoemission stimulBe par des rayons x et la lumihre UV des niveaux internes et des bandes de valence des alliages amorphes Pdso-,Si,,Co,.Les spectres XPS montrent un Blargissement du niveau 2p de Co dans les alliages tandis que les Bnergies de liason sont les m6mes comme pour Co polycrystallin. On discute le comportement des atoms Co pendant la formation des alliages. Les spectres UPS des bandes de valence montrent un dBplacement de la bande 4d de Pd vers les Bnergies plus grandes et une contribution de Co B la densite des Btats au dessus du niveau de Fermi des alliages Pd-Si.

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“…For this reason, we argue that the center atoms are the solute Cu(Al) and the surrounding atoms the solvent Zr. In fact, earlier ultraviolet photoelectron spectroscopy (UPS) investigations on Zr 1−x Cu x systems [25,26] could point out that the d-band of Zr and Cu shifts oppositely to the low and high energy direction respectively, and the electronic structure at E f is accordingly dominant by the d-band of Zr. The result observed here is an indication of the chemical order associated with the strong interaction between Zr and Cu due to a large negative heat of mixing [1].…”

Section: Stm Current Images and Chemical Orderingmentioning

confidence: 99%

Local atomic order of a metallic glass made visible by scanning tunneling microscopy

Luo

Samwer

2018

J. Phys.: Condens. Matter

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Exploring the atomic level structure in amorphous materials by STM becomes extremely difficult due to the localized electronic states. Here we carried out STM studies on a quasi-low-dimensional film of metallic glass ZrCuAl which is 'ultrathin' compared with the localization length and/or the length scale of short range order. The local electronic structure must appear more inherent, having states at E available for tip-sample tunneling current. To enhance imaging contrasts between long-range and short-range orders, the highly oriented pyrolytic graphite was chosen as substrate, so that the structural heterogeneity arising from competition between the glass former ability and the epitaxy can be ascertained. A chemical order predicted for this system was observed in atomic ordered regimes (1-2 monolayers), accompanied with a superstructure with the period Zr-Cu(Al)-Zr along three hexagonal axes. The result implies a chemical short range order in disordered regimes, where polyhedral clusters are dominant with the solute atom Cu(Al) in the center. An attempt for the structural modelling was made based on high resolution STM images, giving icosahedral order on the surface and different Voronoi clusters in 3D space.

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Photoemission (XPS, UPS) studies of Pd-Si metallic glasses

Cited by 57 publications

References 8 publications

Advanced XPS characterization: XPS-based multi-technique analyses for comprehensive understanding of functional materials

Advanced XPS characterization: XPS-based multi-technique analyses for comprehensive understanding of functional materials

Photoemission Studies of Pd_80−xSi₂₀Co_x Amorphous Alloys

Local atomic order of a metallic glass made visible by scanning tunneling microscopy

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Photoemission (XPS, UPS) studies of Pd-Si metallic glasses

Cited by 57 publications

References 8 publications

Advanced XPS characterization: XPS-based multi-technique analyses for comprehensive understanding of functional materials

Advanced XPS characterization: XPS-based multi-technique analyses for comprehensive understanding of functional materials

Photoemission Studies of Pd80−xSi20Cox Amorphous Alloys

Local atomic order of a metallic glass made visible by scanning tunneling microscopy

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Photoemission Studies of Pd_80−xSi₂₀Co_x Amorphous Alloys