The oxidation kinetics of magnesium at low temperatures and low oxygen partial pressures |
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Authors: | M. Kurth P.C.J. Graat E.J. Mittemeijer |
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Affiliation: | Max Planck Institute for Metals Research, Heisenbergstr.3, D-70569 Stuttgart, Germany |
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Abstract: | The initial oxidation of magnesium at oxygen partial pressures between 1.3 × 10− 8 Pa and 1.3 × 10− 5 Pa and at temperatures just above room temperature has been investigated in situ with X-ray photoelectron spectroscopy (XPS) and ellipsometry. Quantitative analysis of the XPS spectra showed that the initially formed oxide has a higher Mg/O ratio (> 1.3) than bulk MgO. Ellipsometry measurements indicated that the band gap values of the oxide layers are considerably smaller than the value expected for bulk MgO ( 2.5 eV vs. 7.8 eV). From the XPS and ellipsometry data recorded as a function of oxidation time the oxidation kinetics have been determined. The kinetics has been described quantitatively with a coupled currents model, involving simultaneous transport of electrons and ions through the oxide layer. |
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Keywords: | Ellipsometry X-ray photoelectron spectroscopy (XPS) Oxidation Magnesium |
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