首页 | 本学科首页   官方微博 | 高级检索  
     


The oxidation kinetics of magnesium at low temperatures and low oxygen partial pressures
Authors:M. Kurth   P.C.J. Graat  E.J. Mittemeijer  
Affiliation:

Max Planck Institute for Metals Research, Heisenbergstr.3, D-70569 Stuttgart, Germany

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.
Keywords:Ellipsometry   X-ray photoelectron spectroscopy (XPS)   Oxidation   Magnesium
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号