Iron depth profile

M. F. Toney and S. Brennan. Structural Depth Profiling of Iron Oxide Thin Films using Grazing Incidence Asymmetric Bra X-ray DiflFraction. J. Appl. Phys. 65J 4763, 1989. 

Fig. 2.9. Depth profiles ofthin (3-5-nm) oxide films [2.10] on (A) pure iron, (B) Fe-12Cr-l Mo alloy.

The electron interaction between nanosized gold particles and iron oxide support is only one factor which determines the properties of the gold/oxide system. For instance, in the Au/FeO,c/Si02/Si(l 0 0) model sample the depth profile (after successive Ar ion bombardment at a... 

The depth profiling studies suggest that two different processes govern the formation of automotive exhaust particles. The elemental surface predominance on large particles is attributed to the deposition of volatile Pb and S species (e.g. PbBrCl, SO2) onto the surfaces of refractory iron-containing particles in the automotive exhaust system (11,12). The iron-rich particles are probably derived from corrosion and ablation of the exhaust system. The smaller, more homogeneous particles may form by a nucleation process in which PbBrCl forms rather pure molten droplets when the exhaust system temperature falls below the saturation point (12). 

Quantitative Auger electron spectroscopy depth profiling of iron oxides formed on Fe (100) and polycrystalline Fe by exposure to gas phase oxygen and borate buffer solution. Langmuir 6 1683-1690... 

F. Bodart, G. Deconninck, Concentration depth profiling in fluorine implanted iron, Nucl. Instr. Meth. 197 (1982) 59-63. 

Figure 7.14 Depth profiles of the 3-to-2 photon ratio for plain silica Xerogel and versions that include tantalum (blue upward triangles) or iron (green downward triangles). In the plain and tantalum case, positronium can move far through the open sponge like network of channels. This is reduced dramatically for the case of embedded iron. The line stems from a fit to extract the escape depth of 880 nm.

Figure 33.8 XPS depth profile of plasma polymer of TMS deposited on (a) (Ar-hH2) plasma treated pure iron, (b) O2 plasma treated pure iron.

Figure 8 Depth profile (meters below land surface) of the stratigraphy, sulfate reduction rates, sulfate concentration, iron sulfide content of sediments, and dissolved organic carbon in groundwater obtained from an...

XPS analysis of the corrosion film on Cor-Ten A, Table VI, gives results similar to those obtained by corrosion film mass balance, TGA, and XRD. The principal film constituents in the outer 10 nm of the film are 202 and FeOOH, with there being somewhat more iron present as Fc203 than FeOOH. This would be expected in a film that dehydrates. However, if this is true, then the 2 1 atomic ratio of oxygen to iron indicates that even the outermost surface of the film contains substantial water. ISS depth profiles for the... 

So far, dissolved iron has been discnssed with respect to the assimilation by phytoplankton. The chemical state of bioavailable dissolved species is presently a matter of intensive stndies and discussions. Due to thermodynamic reasons concentrations of free ions of dissolved iron are extremely low under oxic and pH-nentral conditions. A discussion paper by Johnson et al. (1997) reviews regional distributions and depth profiles of dissolved iron and points ont that at greater depth the iron concentrations always remain constant of 0.6 nM. Other elements with such short residence time (100 to 200 years) typically continuously decrease with depth and age. This suggests a substantial decrease in the iron removal rate below this concentration. As organic ligands with a binding capacity of 0.6 nM Fe have been found (Rue and Bruland 1995 Wn and Luther... 

Figure 3 Depth profiles for nitrate and filterable concentrations of trace element nutrients (iron, zinc, and cobalt) in the subarctic North Pacific Ocean (ocean station Papa, 50.0°N, 145.0°W, Aug. 1987). Data from Martin JH, Gordon RM, Fitzwater S, and Broenkow WW (1989) VERTEX Phytoplankton/iron studies in the Gulf of Alaska. Deep-Sea Research 36 649-680.

Figure 8 Depth profiles of dissolved Iron In (A) the North Pacific (solid symbols 50°N 145°W Martin et ai, 1989) and the North Atlantic (open symbols 47°N 20°W Martin et al., 1993), and (B) the central North Pacific (28°N, 155°W Bruland eta ., 1994).

FIGURE 10.28 Depth profile of dissolved iron in a flooded organic soil. (Redrawn from D Angelo and Reddy, 1994a.)... 

Studies of passivation layers and corrosion phenomena, particularly with iron and magnesium using EXAFS, NEXAFS and related X-ray absorption spectroscopies have been reviewed elsewhere [589]. Using GIXAFS, depth profiling has become possible and spatially resolved studies of silver dissolution and lithium intercalation have been reported. 

Z. Szklarska-Smialowska, H. Vierfhaus, M. Janik-Czakor, Electron spectroscopy analysis of in-depth profiles of passive films formed on iron in Cl containing solutions, Corros. Sci. 16 (1976) 649-652. 

Materials science (microelectronics analysis, surface layers, multilayers, PIXE channeling of dopants in crystals, depth profiling, binary alloys, impurities deposited in nuclear fusion devices, magnetic relaxation in nanocrystalline iron, insulating materials, radiation-induced segregation, superconductors, catalysts, and diffusion studies). 

Figure 6.21 Auger depth profiles measured on Fe-25Cr alloy anodically passivated at 0 V and at 0.5 V in solutions of 0.4 M Na2S04 + 0.1 M H2SO4 and of 1 M NaOH, respectively. In acid solution the passive film is enriched in chromium oxide while in alkaline solution it contains mostly iron oxide [21].

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