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A New Iron Sulfide Precipitated from Saline Solutions

^a Technion-Israel Institute of Technology, Faculty of Agricultural Engineering, IL-32000 Haifa, Israel
^b Dept of Soil and Crop Sciences, College of Agriculture and Life Sciences, Texas A&M University, College Station, TX 77843-2474

View larger version (22K): [in a new window]   Fig. 1. X-ray diffraction curves of precipitated iron sulfides from the reactions between sulfide ions and three Fe sources in saline environments at different times. Goethite in NaCl solution (A). Ferrihydrite in NaCl solution (B). Ferrihydrite in artificial seawater (C). S = rhombic sulfur; P = pyrite, N = NaCl; peak labels are in nanometers.

View larger version (144K): [in a new window]   Fig. 2. Transmission electron microscope image of FeS with long lattice fringes spaced at approximately 1 nm trending downward to the right (A); long lattice fringes at various orientations (B); and short lattice fringes some parallel and others converging in almost horizontal orientation (C). The scale is in nanometers.

View larger version (93K): [in a new window]   Fig. 3. Proposed structure for dorite is composed of two sheets of edge-linked tetrahedra, one orderly like mackinawite and the other containing many defects. The two sheets with only light tetrahedra have the mackinawite structure with Fe in all tetrahedral positions and sulfur atoms at the vertices. The other sheets do not have Fe atoms in all the tetrahedral sites with the larger, darker tetrahedra having water molecules filling out the Fe coordination shell.