STM and XPS investigation of the oxidation of the Al4(Cr,Fe) quasicrystal approximant

Hydrogen behavior in Al Cr alloys: Synchrotron-based photoelectron microscopy of the rapidly solidified structure

“…This supposes that Cr suppresses the Al surface oxidation in Cr-enriched surface regions, while oxidized aluminum dominates the Cr-free areas. These findings are supported by other investigations of the AleCr system indicating that Cr tends to be concentrated under the oxide layer [41,42] or amalgamated in metallic state into the aluminum oxide film [41].…”

“…The importance of this information is relevant to the fact that many Al-based systems have high corrosion resistance and subsequent addition of Cr can widen the stability range of these alloys and improve their resistance to oxidation in aggressive environments [41]. However, experimental studies focused on the oxidation of AleCr alloys have typically used conventional XPS technique to examine the surface composition of oxide films [41,42].…”

Chelation of metal ions with citric acid in the ammoniation process of wet‐process phosphoric acid

“…Figure presents the Al 2p core level of the water‐insoluble compounds. The Al 2p 3/2 peaks at 72.25 eV (1.158 × 10 −17 J) and 72.85 eV (1.167 × 10 −17 J) binding energy in the water‐insoluble compounds formed with the citric acid addition are near the values of pure metal; therefore, the spectrum is unresolved . Compared with the water‐insoluble compounds formed without the citric acid addition, the binding energy of Al 2p changes from 75.40 eV (1.208 × 10 −17 J) and 75.21 eV (1.205 × 10 −17 J) to 72.25 eV (1.158 × 10 −17 J) and 72.85 eV (1.167 × 10 −17 J), respectively.…”

Self-Assembly of Metal Oxide Nanoparticles in Liquid Metal toward Nucleation Control for Graphene Single-Crystal Arrays

“…As shown in Figure 2E, on the surface of the substrate, three major peaks are located at 74.09, 75.11, and 77.20 eV, corresponding to the Al 2p, Cu 3p 3/2 , and Cu 3p 1/2 bands, respectively. [22][23][24] After the removal of the surface layer, the peak intensity corresponding to Al was reduced, which demonstrates the gradually decreasing distribution of the alumina in the liquid Cu bulk, as shown in Figure 2F. Figure 2G shows the signal for O 1s band collected at the surface.…”