Casa xps component fitting1/12/2024 ![]() ![]() Spectra are fitted with the asymmetric line shape and loss/satellite peaks for Ni metal (Table 1 and Figure 1) and an empirical fit of the NiO and Ni(OH)2 line shapes from parameters derived from standard samples (Table 1 and Figure 2). ![]() In one related experiment in this laboratory with MnO heated to 600☌ for 12 h, there was no significant change in the higher BE component ascribed to defective oxide, indicating little or no surface hydroxides are present.Ĭurve fitting techniques for nickel species use specified empirical fitting parameters that take into account the unique peak shapes of the various Ni compounds. Pure oxide samples were not heated to remove possible surface hydroxides before analysis to avoid reduction of the oxide. Inspection of the C 1s spectrum should confirm if this is occurring. It should be noted that this second peak could result from carbonates species. ![]() These contributions from defective sites are unlikely to compromise the assignment of chemical states. For all of the oxides studied here this peak has an area contribution between 20 and 40 % consistent with other powdered oxides including nickel and chromium. Other work has shown that this is a defective oxide peak and not hydroxide as the presence of hydroxide has been ruled out by other methods. For many of the pure oxide samples there is a second higher BE peak that can be ascribed to contributions from a defective oxide component inherent in these oxide surfaces. ![]()
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