Analysis of XPS spectra of Fe²⁺ and Fe³⁺ ions in oxide materials

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• 作者：Toru Yamashita ; Peter Hayes
• 关键词：XPS ; Iron oxide ; Quantitative analysis ; Chemical state
• 刊名：Applied Surface Science
• 出版年：2008
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：15 February 2008
• 卷：254
• 期：8
• 页码：2441-2449
• 文件大小：869 K

摘要

Samples of the iron oxides Fe_0.94O, Fe₃O₄, Fe₂O₃, and Fe₂SiO₄ were prepared by high temperature equilibration in controlled gas atmospheres. The samples were fractured in vacuum and high resolution XPS spectra of the fractured surfaces were measured. The peak positions and peak shape parameters of Fe 3p for Fe²⁺ and Fe³⁺ were derived from the Fe 3p XPS spectra of the standard samples of 2FeO·SiO₂ and Fe₂O₃, respectively. Using these parameters, the Fe 3p peaks of Fe₃O₄ and Fe_1−yO are analysed. The results indicate that high resolution XPS techniques can be used to determine the Fe²⁺/Fe³⁺ ratios in metal oxides. The technique has the potential for application to other transition metal oxide systems.