Discrimination between γ'-Fe4N and ε-Fe2-3N iron nitride compounds using PCA of Auger electron spectra
In: Papers presented at ECASIA'05: Proceedings of the 11th European Conference on Applications of Surface and Interface Analysis, 25-30 September 2005, Vienna, AustriaSurface and interface analysis 38(4):620-623; Jg. 38 (2006) 4, S. 620-623
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Zugriff:
AES offers high spatial resolution that is useful when analysing cross sections of nitrided steels. To discriminate between different iron nitride compounds in such an analysis, so-called factor analysis (FA) can be applied. This requires acquisition of Auger electron spectra which are associated with either the γ-Fe4N or the ε-Fe2-3N phases as principal components. In this study, the N KLL and Fe LMM Auger electron spectral lines of γ'-Fe4N and ε-Fe2-3N phases were acquired in great detail from the pure γ'-Fe4N and ε-Fe2-3N phases obtained by gaseous nitriding of pure iron. To this end, two different samples of known composition were analysed. Firstly, Auger electron spectra were recorded from a nitrided layer with large γ'-Fe4N grains (∼30 μm) on top of an iron substrate. Secondly, Auger electron spectra were recorded from an ε-Fe2-3N outer layer (∼6 μm) with 26 at.% N, on a γ'-Fe4N layer (∼4 μm) with 20 at.% N, created on top of an iron substrate. The latter sample was also used for FA. It is shown that principal component analysis of a series of N KLL Auger electron spectra recorded from the iron nitride double layer could be represented by three contributions. These principal components are associated with γ'-Fe4N, ε-Fe2-3N and the background. On the other hand, when a background subtraction was applied to the acquired N KLL Auger electron spectra, it was not possible to discriminate between the two iron nitride phases.
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Discrimination between γ'-Fe4N and ε-Fe2-3N iron nitride compounds using PCA of Auger electron spectra
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Autor/in / Beteiligte Person: | VANDENDAEL, I ; SLOOF, W. G ; STEENHAUT, O ; HUBIN, A ; VEREECKEN, J |
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Quelle: | Papers presented at ECASIA'05: Proceedings of the 11th European Conference on Applications of Surface and Interface Analysis, 25-30 September 2005, Vienna, AustriaSurface and interface analysis 38(4):620-623; Jg. 38 (2006) 4, S. 620-623 |
Veröffentlichung: | Chichester: Wiley, 2006 |
Medientyp: | Konferenz |
Umfang: | print, 15 ref |
ISSN: | 0142-2421 (print) |
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