Oxidation of lanthanum overlay ers on Cu(111)

The oxidation of ultrathin lanthanum overlayers on Cu(111) has been studied by XPS, ISS, TPD and LEED. At 300 K the deposited La films are readily oxidised by exposure to O 2 to give a disordered La 2O 3 film. This oxide may then be ordered by annealing at over 700 K in vacuum, producing a surface a...

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Bibliographic Details
Published in:Surface science 1995, Vol.322 (1), p.41-50
Main Authors: de Asha, A.M., Nix, R.M.
Format: Article
Language:English
Subjects:
Copper
Epitaxy
Growth
Lanthanides
Lanthanum oxide
Low energy electron diffraction (LEED)
Oxidation
X-ray photoelectron spectroscopy
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Summary:The oxidation of ultrathin lanthanum overlayers on Cu(111) has been studied by XPS, ISS, TPD and LEED. At 300 K the deposited La films are readily oxidised by exposure to O 2 to give a disordered La 2O 3 film. This oxide may then be ordered by annealing at over 700 K in vacuum, producing a surface analogous to La 2O 3(001). Further heating in a low pressure of oxygen induces an irreversible structural transformation to a more complex oxide structure which still exhibits a coincidence relationship with the substrate. All the oxide films are stable to 873 K, after which a gradual reduction in the apparent surface La and O concentrations is observed.
ISSN:0039-6028
1879-2758
DOI:10.1016/0039-6028(95)90015-2