Effect of sulphur on the surface segregation in Co50Ni50 alloy

Godowski, P. J.; Rudny, J.

doi:10.1002/pssa.2210990223

Cited by 5 publications

(1 citation statement)

References 10 publications

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“…One has to allow for all these contributions in order to perform a reconstruction of the true concentration profile [15][16][17][18][19][20]. It is known that 95% of the total number of the secondary electrons are generated in a surface layer with a thickness of 3l 0 cos j [5][6][7][8][9]14].…”

Section: Mathematical Treatment Of Spectramentioning

confidence: 99%

Nondestructive Depth Profiling by Electron Spectroscopy with a Tuned Energy Excitation Source

Horodetsky

Kleiman

2002

phys. stat. sol. (a)

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A novel nondestructive layer-by-layer method of chemical analysis that can be realized in an ordinary electron spectrometer is proposed. This method is based on the ionization spectroscopy (IS) and involves two sequential operations: a) collection of a series of experimental IS spectra taken at various primary beam energies; and b) recovering of the true concentration or phase depth profile using a reconstruction procedure that involves a mathematical treatment of these spectra. The proposed method was used to study the behavior of a FeNi 3 (100) alloy at temperatures close to the order-disorder transition temperature (T or ¼ 776 K). Using the reconstruction procedure, an oscillatory concentration profile in ten upper layers of FeNi 3 (100) alloy was obtained. The proposed method was also used in an investigation of the temperature dependence of the composition in the first ten layers of the Co 50 Ni 50 (100) alloy. In the temperature range 900 to 1200 K, the composition of all analyzed surface layers stabilized and remained the same, consisting of pure cobalt in the first layer, with its concentration decreasing in the three underlying layers to 82, 68 and 55 at%, respectively. These results correlate with LEED analysis that also had shown the existence of an hcp Co phase at the Co 50 Ni 50 (100) alloy surface.

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