Topological short-range disorder in solid solutions: An extended x-ray-absorption fine-structure spectroscopy and computer-simulation study
- 15 September 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 38 (9), 5944-5964
- https://doi.org/10.1103/physrevb.38.5944
Abstract
The present extended x-ray-absorption fine-structure (EXAFS) investigation aims at determining the atom-pair displacements on a local scale in the system, for the three types of pairs Au-Au, Au-Ni, and Ni-Ni. X-ray-absorption spectra have been obtained above both edges (Au and Ni K), over the whole composition range. For the purpose of the separation of the Au and Ni scattering contributions, a detailed analysis of EXAFS over a wide photoelectron wave-vector range beginning close to the edge has been performed. The amplitude and phase functions for unlike-neighbor pairs have been obtained in two ways: first by using empirically refined theoretical partial phase shifts, which enabled us to calculate the total phase functions, and secondly by making use of fluorescence recorded spectra of dilute alloys from which appropriate amplitude functions have been extracted. Many low-k amplitude effects such as the photoelectron wave curvature, the experimental energy resolution, the limited core-hole lifetime, and the many-electron excitation factors have been analyzed, and taken into account, as well as the difference between p- and d-symmetry photoelectron scattering.
Keywords
This publication has 47 references indexed in Scilit:
- New high-energy approximation for x-ray-absorption near-edge structurePhysical Review B, 1986
- Applications of X-ray absorption spectroscopy in materials science: Status and new trendsZeitschrift für Physik B Condensed Matter, 1985
- EXAFS and diffractionZeitschrift für Physik B Condensed Matter, 1985
- EXAFS measurements on FeB metallic glasses: Asymmetry of the radial distribution functionSolid State Communications, 1981
- Many-body effects on extended x-ray absorption fine structure amplitudesPhysical Review B, 1980
- Determination ofandcontributions to theextended x-ray absorption fine structurePhysical Review B, 1977
- Measurement of Lorentzian linewidths: Numerical evaluation of the Voigt integralNuclear Instruments and Methods, 1976
- The probing depth in photoemission and auger-electron spectroscopyJournal of Electron Spectroscopy and Related Phenomena, 1974
- Morse-Potential Evaluation of Second- and Third-Order Elastic Constants of Some Cubic MetalsPhysical Review B, 1967
- Constitution of Binary AlloysJournal of the Electrochemical Society, 1958