Amorphous Fe

X-ray spectroscopy (DRON-3, cadmium cathode) showed the presence of different forms of iron (a-Fe, b-Fe), amorphous carbon, possibly iron carbide and dense forms of carbon, as well as Fe2C>3 (Figure 5). The spectrum shows signals which are characteristic for Fe-C bonds and for a hexagonal symmetry of carbon. Small angle measurements also indicated the presence of amorphous iron. The presence of amorphous iron and iron carbide may explain the low oxidation of the adsorbent particles in water. 

Below are experimentally determined data by various authors (see Davison, 1991) plotted as —log [Fe ] versus pH for amorphous iron sulfide at 298 K and 0.1 MPa H2S (= 10 atm). The data with numbers refer to various aged (hours) iron sulfide. What solubility constant for FeS (amorphous) + = Fe + HS can be derived from these data ... 

Obtained by processing of a product from an Fe and Mn removal treatment unit. Properties 37% of Fe, amorphous [1670]. 

The preparation of the supported catalytic Fe-clusters have been recently reported by our laboratory for Fe/Nafion membranes [1,2,3] for Fe/Nafion/glass-mats [4,5] micro-encapsulated Fe-alginate beads [6] Fe-amorphous polycrystalline thin film fused copolymers [7] and finally Fe/silica woven fabrics [8]. Experiments were conducted with Nafion perfluorinated cation transfer membrane. Photolysis experiments were carried out by means of a Hanau Suntest Lamp with tunable light intensity equipped with an IR filter to remove infrared radiation. Light... 

Pore waters in the upper 20 cm tend to be saturated or supersaturated with respect to fine-grained FeS (amorphous) at FOAM, variably saturated or undersaturated with respect to mackinawite or greigite at DEEP, and generally undersaturated with respect to these phases at NWC. Below 20 cm at NWC and DEEP, pore waters are undersaturated with respect to the monosulfides. If sulfide equilibria control Fe concentrations below 20 cm, then the stability of the corresponding solid-phase sulfide must increase at deeper water stations. 

Early results (39,40,113) on the hydrogenation of carbon monoxide on Ni, Fe, and mixed Ni-Fe amorphous alloys with P and/or B as metalloids are summarized in Ref. 45. Experiments with 15 different amorphous catalysts and their crystallized derivatives in a flow reactor, at atmospheric pressure, and in the temperature range of 493-643 K led to the following main findings ... 

Structure Sructural parameters Nanocrystals (bcc-Fe) + Amorphous matrix Amorphous matrix + Nanocrystals (fcc-Al) Nanocrystals Fei4Nd2B (+Fe3B, bcc-Fe, Am)... 

Curie and compensation temperatures of R-Fe amorphous and crystalline alloys... 

Lub] Luborsky, F.E., Beeker, J.J., Liebermann, H.H., Replaeement of Boron by Carbon in B-C-Fe Amorphous Alloys , Rapidly Quenched Metals III Metals Soc. Part II, 249-52 (1978) (Experimental, 3)... 

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