XPS study of fresh and oxidized (Pb,Ge)Te surfacesстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The oxidation of (Pb,Ge)Te crystal surfaces at ambient temperature and humidity was studied by means of XPS in a time range from minutes to months. Vacuum-cleaved crystal was used for the experiment. It was found that Ge in a PbTe lattice occupies two different positions. At one of them, donor behaviour is revealed and the concentration of donor atoms increases at temperatures lower than those of the cubic-rhombohedral phase transition. It was found that oxidation takes place even after a few minutes of air exposure. Germanium atoms oxidize entirely to oxidation state +4, this being followed by slow oxidation of tellurium atoms from oxidation state -2 to +4. After a long air exposure, significant surface enrichment in Pb was observed. Copyright (C) 2002 John Wiley Sons, Ltd.