Local density of unoccupied states in ion-beam-mixed Pd-Ag alloys

Journal Article · Mon Apr 01 00:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.10328· OSTI ID:282938

Chae, K H; Jung, S M; Lee, Y S; Whang, C N ^[1]; Jeon, Y ^[2]; Croft, M; Sills, D ^[3]; Ansari, P H; Mack, K ^[4]

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1. Department of Physics, Yonsei University, Seoul 120-749 (Korea)
2. Department of Physics, Jeonju University, Jeonju 560-759 (Korea)
3. Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855-0849 (United States)
4. Department of Physics, Seton Hall University, South Orange, New Jersey 07079 (United States)

X-ray absorption spectroscopy (XAS) measurements have been used to probe the electronic structure of ion-beam-mixed (IBM) Pd-Ag thin films with bulk alloys being studied for comparison. Pd {ital L}{sub 3} and Ag {ital L}{sub 3} absorption edges for pure Pd, Ag, and Pd{sub 1{minus}{ital x}}Ag{sub {ital x}} alloys are discussed. Structural information from both x-ray diffraction and the XAS fine structure oscillations are discussed. The observed decrease of the white-line feature strength, at the Pd {ital L}{sub 3} edge, indicates that the local density of unoccupied Pd 4{ital d} states declines upon alloying with Ag in a manner similar to that observed in previous bulk studies. However, while the Pd {ital d}-hole count decreases monotonically for bulk alloys, in the IBM alloys it saturates at higher levels in the Ag-rich materials. This disparity is interpreted on the basis of a modified charge transfer due to structural differences in the IBM alloys. The Ag {ital L}{sub 3} near-edge region is largely unchanged in these alloys, indicating that the charge transferred away from the Ag site is dominantly of {ital non}-{ital d} type. Our experimental results are discussed in the context of recent electronic structure calculations and of previous work on this alloy system. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 282938
• Journal Information: Physical Review, B: Condensed Matter, Vol. 53, Issue 15; Other Information: PBD: Apr 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
PALLADIUM ALLOYS
X-RAY SPECTRA
PHYSICAL PROPERTIES
SILVER ALLOYS
PALLADIUM
ELECTRONIC STRUCTURE
SILVER
SYNCHROTRON RADIATION
THIN FILMS
STOICHIOMETRY
LAYERS
ABSORPTION SPECTRA
X-RAY DIFFRACTION
INTERFACES
CRYSTAL STRUCTURE
ION BEAM INJECTION
ARGON IONS
BULK PROPERTIES