Influence of solid-state effects on theKβ-to-Kαx-ray intensity ratios of Ni and Cu in various silicide compounds

Abstract

have been measured following excitation by 59.54 keV ␥ rays from a 200 mCi 241 Am point source. Comparison of the intensity ratios for Ni with the multiconfiguration Dirac-Fock calculations indicates decreasing 3d electron population with the increase of silicon concentration, a trend similar to the one predicted by the previous theoretical calculations ͓O. Bisi and C. Calandra, J. Phys. C 14, 5479 ͑1982͔͒. However, quantitatively our results for the Ni 3d electron population are different from the results reported there. The intensity ratios for Ni and Cu in disilicide compounds indicate enhancement of the K␤-to-K␣ ratio over the pure metal values, but for the other silicide compounds the Ni intensity ratios show opposite behavior than Cu, suggesting a difference in the nature of electron delocalization.

XPS calibration study of thin‐film nickel silicides

“…Theoretical calculations [23] show that the valence electron configurations of Ni go from 3d 8 [25] obtained quantitatively different results but the trend is similar, i.e. decreasing 3d-electron population with increased Si concentration.…”

Concept of effective states of atoms in compounds to describe properties determined by the densities of valence electrons in atomic cores

“…The studies intended to extract the information about the electronic structure in atomic cores in different chemical compounds from the XES data are performed, in particular, in Refs. [27][28][29]. The authors estimate the 3d shell occupancies in various metals by comparing the measured Kβ to Kα x-ray intensity ratios to the results of atomic multiconfiguration Dirac-Fock computations.…”

The discrepancy of the measured change of d-electron occupancy in VxNi100−x and FexNi100−x alloys using EELS and kβ-to-kα X-ray intensity ratios

“…On the other hand, many interesting properties of alloys are influenced by d-electrons in transition elements. As a result over the past half centuries the change of d-electron occupancy of transition elements in alloys has been receiving special attention and many means were adopted, such as X-ray photoemission spectroscopy (XPS) [2,[8][9][10][11][12], X-ray absorption spectroscopy (XAS) [13][14][15][16], k␤-to-k␣ X-ray intensity ratios [17][18][19][20][21], and electron energy loss spectroscopy (EELS) [4,6,7,[22][23][24]. In this paper we focus on the difference between the measured d-electron occupancy from k␤-to-k␣ X-ray intensity ratios and EELS.…”