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The formation of carbonate species on alumina upon CO and CO 2 exposure was studied by PM-IRAS and XPS, utilizing the model system of an ultrathin alumina film grown on NiAl(110). No carbonates were detected under UHV conditions, even after exposures up to 100.000L of the gasses. In contrast, in a 100mbar CO 2 atmosphere the formation of monodentate carbonates was identified. The surface...
The adsorption of H 2 and H 2 O on differently pretreated β-Ga 2 O 3 samples, exhibiting variable surface chemistry and surface defect concentration, was studied by temperature-programmed reduction, oxidation, and desorption; Fourier transform infrared spectroscopy; and electric impedance measurements. Adsorption of H 2 at 300–473 K resulted in the formation...
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