Abstract
Transformations of the surface and bulk of nanoscale ytterbium films during the surface interactions of these films with different ligand molecules have been studied. It has been shown that a combination of two factors, i.e., the existence of a lone electron pair in CO and O2 molecules and the unoccupied 5d level lying near the Fermi level in metallic divalent ytterbium, causes the formation of a stable chemisorption state of the molecule-nanofilm surface layer in which donor-acceptor bonds between gas molecules and surface metal ions are formed. As a result, ytterbium on the surface and in the bulk of the nanofilm is oxidized to a non-autonomous trivalent electronic state. The depth to which this transition propagates in the nanofilm has been determined; its anomalously large value (from 9 to 22 layers according to different estimates) has been explained. It has also been shown that the ligand molecule layer on the ytterbium surface is filled in two stages. The two-stage mechanism of this process is reflected by the nonmonotonic behavior of concentration dependences of the work function of CO-Yb and O2-Yb structures.
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Original Russian Text © D.V. Buturovich, M.V. Kuz’min, M.V. Loginov, M.A. Mittsev, 2015, published in Fizika Tverdogo Tela, 2015, Vol. 57, No. 9, pp. 1822–1829.
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Buturovich, D.V., Kuz’min, M.V., Loginov, M.V. et al. Valence transition 2+ → 3+ induced in ytterbium nanofilms by CO and O2 molecules chemisorbed on their surface. Phys. Solid State 57, 1870–1877 (2015). https://doi.org/10.1134/S1063783415090061
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DOI: https://doi.org/10.1134/S1063783415090061