A standard form of spectra for quantitative ESCA-analysis

Berresheim, K.; Mattern-Klosson, Monika; Wilmers, M.

doi:10.1007/bf00322121

Cited by 54 publications

(20 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This value is the average binding energy measured for the C1s signals collected on thermal and tribostressed samples at lower temperature. The thickness and composition of the layers were calculated applying a three-layer model [23], where the peak areas were corrected for the photoionisation crosssection r i according to Scofield [24], the analyser transmission function T(E i ) of the instrument [25], the density of the model compound q divided by the atomic weight of the element A i , the inelastic mean free path (IMFP) k(E i ) according to Tanuma et al [26,27] and cos(h), where h is the emission angle (see figure 3). The three layers were iron oxide as a semi-infinite substrate, covered with the reaction layer, which, in turn, was coated with an organic layer.…”

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 99%

XPS study of the influence of temperature on ZnDTP tribofilm composition

2006

View full text Add to dashboard Cite

Antiwear additives, such as zinc dialkyldithiophosphate (ZnDTP), find application in many different industrial sectors. Although it is understood that certain ZnDTP concentrations need to be used to achieve an effective antiwear performance, there has been very little work published concerning the effect of temperature on the interactions of the additive and its adsorption mechanism on steel. In this article, 100Cr6 (52100) steel ball-on-disc experiments under solutions of zinc dialkyldithiophosphate (ZnDTP) in poly-a-olefin (PAO) were performed at different temperatures, ranging from 25 to 180°C. The discs were analysed after the experiments by means of small-area, imaging and angle-resolved X-ray photoelectron spectroscopy (XPS). The composition of the reaction film was found to change as a function of the applied temperature and also to vary within the film as a function of depth: Longer polyphosphate chains were found at higher temperatures as well as towards the outer part of the reaction film.

show abstract

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 99%

XPS study of the influence of temperature on ZnDTP tribofilm composition

2006

View full text Add to dashboard Cite

show abstract

“…The sensitivity factors were calculated from the Scofield photoionization cross sections [35], the inelastic mean free path corrected for the emission angle, and the transmission function of the analyzer, as described in Ref. [36], assuming the sample to be homogeneous. The inelastic mean free path, i.e.…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

Surface reactivity of tributyl thiophosphate: effects of temperature and mechanical stress

et al. 2006

View full text Add to dashboard Cite

The surface reactivity of tributyl thiophosphate on iron surfaces has been studied in situ by attenuated total reflection Fouriertransform infrared spectroscopy, X-ray photoelectron spectroscopy and temperature-programmed reaction and desorption spectroscopies. The results show that at temperatures lower than 373 K the molecule forms a physisorbed layer on the iron substrate. At 373 K a reaction takes place with the formation of an organic layer, together with iron polyphosphate and sulfate. At higher temperatures temperature-programmed desorption results suggest that the mechanism involves P-O bond scission to yield butoxy groups. This could be preceded by P=S bond scission to give tributyl phosphite, which then, in turn, undergoes P-O bond scission to produce butoxy groups. The results obtained following tribological testing are in agreement with those of thermal tests: evidence of polyphosphate and sulfate formation is found.

show abstract

“…These values are valid for inorganic compounds according to Seah and Dench (1979). The transmission function correction was calculated according to Berresheim et al (1991). The parameters and the sensitivity factors are listed in Table 1.…”

mentioning

confidence: 99%