Amorphous iron-based

Abr] Abrosimova, G.E., Serebryakov, A.V., Sokolovskaya, Zh.D., Change of Structure and Magnetic Properties of Amorphous Iron Base Metal - Metalloid Alloys (in Russian), Fiz. Met. Metalloved., 66(4), 727-730 (1988) (Experimental, Phase Relations, Magn. Prop., 11)... 

With the emplacement of the cover, the atmospheric oxygen that fuelled the precipitation of secondary As phases was essentially eliminated. Secondary phases such as jarosite, scorodite and amorphous iron sulfo-arsenates became unstable in the present conditions in the ARS (Salzsauler et at. 2005). Reductive dissolution of the secondary phases and residual arsenopyrite gives rise to 100 mg/L As in pore water at the base of the residue pile (Salzsauler et al. 2005). 

RELATION BETWEEN MAGNETIC PROPERTIES AND THE STRUCTURE OF IRON-BASED AMORPHOUS ALLOYS DETERMINED BY ELECTRON DIFFRACTION... 

Figure 8.6 Size distributions (particles below lpm) based on particle number for different natural water systems Gulf of Mexico (Harris, 1977), foraminifera and diatoms from near-surface South-lndian Ocean (Lai and Lerman, 1975), coastal surface waters of North Pacific Ocean (off Tokyo Bay) (Koike et al., 1990), Grimsel test site groundwater (Switzerland) (Degueldre, 1990), Markham Clinton groundwater (UK) (Longworth et al., 1990), amorphous iron oxy(hydroxo)phos-phate at the oxic/anoxic boundary of Lake Bret (Switzerland) (Buffle et al., 1989), Rhine River (The Netherlands) (van de Meentef al., 1983), Rhine River (Basle, Switzerland) (Newman etal., 1994), St Lawrence River (Canada) (Comba and Kaiser, 1990). Distributions recalculated from the original data as explained in Filella and Buffle (1993) (reproduced from Filella and Buffle, 1993, by permission of the copyright holders, Elsevier Science Publishers BV, Amsterdam).

The surface activation consisting of zinc deposition, heat treatment, and subsequent leaching of zinc (63, 64) was applied to different amorphous iron-, cobalt-, nickel-, and palladium-based alloys (63, 64). SEM measurements indicated the formation of a porous surface layer. Cyclic voltammetric examinations suggested an increase of surface area by about two orders of magnitude. Heat treatments at higher temperatures resulted in thicker, more porous surface layers and higher electrocatalytic activities (Table II). Palladium-phosphorus alloys with Ni, Pt, Ru, or Rh proved to be the best specimens. Pd-Ni-P with 5% Ni, after treatment at 573 K, exhibited even higher activity than that of the Pt-Pt electrode (Table II). These amorphous alloy electrodes were active in the oxidation of methanol, formaldehyde, and sodium formate. 

The overall goal of this study is to develop superior catalysts suitable for use in modem advanced slurry phase or membrane reactors. Successful investigations have produced an iron-based unsupported catalyst with high activity and extended catalyst life (improved attrition resistance). This catalyst was used by the authors to understand the phase transformations from iron oxide precursors after activation to iron carbide crystallites and to characterize the presence of characteristic amorphous carbon species that have been reported to envelop the spent Fe-FTS catalyst grains in form of surface layers. Previous studies suggest two different phases to be considered as the active phase including iron oxide and a mixture of x snd e -carbides (Table 1) and in some instances minor amounts of metallic iron, however the spatial distribution of the different... 

Iron-Based Amorphous Alloys Of all amorphous magnetic alloys, the iron-rich alloys on the basis Fe.v.80 (Si, B) 20 have the highest saturation polarization of 1.5-1.8 T. Because of their relatively high saturation magnetostriction (A,s) of around 30 x 10 , their use as soft magnetic material is limited. The application is focused on transformers at low and... 

J. P. Allemand, F. Fouquet and J. Perez, Influence of Structural Relaxation and Hydrogen Permeation on the Magnetoelastic Effect in Iron-Based Amorphous Alloys, ini Rapidly-Quenched Metals" Vol. 2, S. Steeb and H. Warlimont eds., North-Holland, Amsterdam (1985). 

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