Use of oxygen Auger line relative intensities for characterization of surface oxides on oxidized metals and alloys

Abstract

Exemplifying ri:sults from AES study of high temperature oxidation of dilute copper-aluminium alloys, under low pressures of oxygen, are presented to demonstrate the feasibility of using changes in relative intensities of oxygen Auger lines as :I diagnostic test for oxidation selectivity, at the very early stages of the reaction.

An Inert Metal Anode for Magnesium Electrowinning

“…The data demonstrates clearly that the surface has segregated ahuninum. This effect can be understood as an expression of minimal surface free energy, and has been previously observed using other techniques on single crystal alloys [10]. Angle from Normal (degrees) Figure 5.…”

The effects of surface oxidation and segregation on the adhesional wear behavior of aluminum—bronze alloys

“…Also shown are spectra obtained from the as-polished surfaces and the worn surfaces after 10000 cycles of wear. Figures 5(1) and 5 (11) show that CuO and Cu(OH)2 were not formed in measurable quantities for the as-polished or the wom surfaces for the 1 and 6 w/o alloys. The large decrease in the peak to background intensities was paralleled by a large increase in the surface concentration of carbon compounds.…”

“…Figures 5(1) and 5 (11) are Cu 2p spectra for the 1 and 6 w/o alloy surfaces after argon sputtering of the as-polished surface for 30 min. Also shown are spectra obtained from the as-polished surfaces and the worn surfaces after 10000 cycles of wear.…”

Segregation and preferential sputtering of Al on (100)

“…The surface of Cu 1−x Al x (100) has a (1 × 1) LEED pattern and AES results indicate weak segregation of Al on the clean αphase Cu 1−x Al x surface [1,2]. The oxidation of α-phase CuAl polycrystalline and Cu 1−x Al x (100) surfaces with Al concentrations up to 12% has recently been investigated with AES, XPS and EELS [2][3][4][5]. A strong oxygen-induced segregation of Al has been observed and no oxidation of Cu was measured until oxidation of the surface layer Al had been completed.…”