About Ferrous disulfide, marcasite; Ferrous disulfide, marcasite weighs 4.87 gram per cubic centimeter or 4 870 kilogram per cubic meter, i.e. density of ferrous disulfide, marcasite is equal to 4 870 kg/m³.In Imperial or US customary measurement system, the density is equal to 304.024 pound per cubic foot [lb/ft³], or 2.815 ounce per cubic inch [oz/inch³] .
The electronic, magnetic and optical properties of Co doped marcasite FeS 2 compounds have been investigated through the first-principles calculations. No imaginary frequency emerges in the phonon dispersion curves confirms the Fe 7 CoS 16 and Fe 6 Co 2 S 16 compounds are dynamical stable. Although the pure Fe 8 S 16 compound is a nonmagnetic …
About Marcasite; Marcasite weighs 4.87 gram per cubic centimeter or 4 870 kilogram per cubic meter, i.e. density of marcasite is equal to 4 870 kg/m³. In Imperial or US customary measurement system, the density is equal to 304.024 pound per cubic foot [lb/ft³], or 2.815 ounce per cubic inch [oz/inch³] .; Marcasite is a yellow rhombic crystalline system.
By annealing deposited films in a H 2 S atmosphere at around 500°C for 30 min, a pyrite film containing no marcasite or pyrrhotite is successfully obtained. All pyrite films prepared show p-type conduction. They have a carrier concentration in the range 10 16 –10 20 cm −3 a Hall mobility in the range 200–1 cm 2 /V s.
marcasite to pyrite and vice versa for photo-generated valence band holes in mixed-phase FeS 2 thin films. These findings point to efficient charge separation in the mixed systems as the …
Thin-film studies (compositional, structural, optical, and electrical) revealed that the as-prepared SnS and SnS2 films were polycrystalline in nature; exhibited orthorhombic and hexagonal crystal ...
The pyrite-marcasite phase composition depends strongly on the concentration of sodium in the growth substrate and the sulfur partial pressure during annealing. ... XRD pattern of the films, along ...
Indeed, marcasite is commonly found attached to pyrite crystals in natural minerals (Richards et al., 1995; Rakovan et al., 1986) and marcasite has frequently been observed as an intermediate metastable phase during transformation of precursor materials to pyrite in the thin-film fabrication process (Berry et al., 2012; Sun et al., 2011).
The cubic FeS2 (Pyrite) films are prepared by chemical bath deposition method (CBD) at different iron ion precursor concentrations that varying from 2.0 M to 0.5 M. X-ray diffractograms revealed ...
About Iron disulfide, marcasite; Iron disulfide, marcasite weighs 4.87 gram per cubic centimeter or 4 870 kilogram per cubic meter, i.e. density of iron disulfide, marcasite is equal to 4 870 kg/m³. In Imperial or US customary measurement system, the density is equal to 304.024 pound per cubic foot [lb/ft³], or 2.815 ounce per cubic inch [oz/inch³] .
These have employed ferric concentrations from 0.01 to 1000 mM, as ferric sulfate or ferric chloride, in both oxygen-rich and oxygen-depleted media, over a range of temperatures (20 to 90 °C) in both stirred-tank and packed-bed reactors. ... Marcasite is well-known to be more resistant to oxidation than pyrite. Hence, it is likely that the ...
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A thin film of marcasite, FeS2, was synthesized under vacuum and its structure and reactivity under oxidizing conditions was investigated by means of diffraction and surface analytical techniques ...
X-ray photoelectron spectroscopy studies found the thin marcasite film to be more reactive than natural pyrite (the most ubiquitous FeS 2 dimorph) after exposure to a gaseous O …
In order to study the dissolution kinetics of marcasite and to assess the effects of different environmental factors, marcasite dissolution was studied by means of stirred and non-stirred flow through experiments at the acidic pH range 1–3, at temperatures of 25, 50 and 70 C and at input oxygen concentrations of 6.3 10 6, 6.3 10 5 and 2.7 10 ...
In contrast, FeS 2 thin film annealed at lower temperatures have higher carrier concentrations because it contains FeS and marcasite phase. 22 Because FeS is metal and marcasite has a lower band gap than pyrite, they can cause high current on the film surface.
After the deposition of iron with various oxygen concentrations and plasma parameters, we obtained films with dominating magnetite (Fe 3 O 4) ... the absorption of the marcasite film is extended to 800 nm. The magnetite and pyrite regions of the same films are almost nontransparent, and their absorbance is over the limits of the spectrometer used.
to marcasite structure, and (106) and (304) planes, corresponding to FeS (lite) phase are observed along with the pure pyrite ... (200) at higher concentrations of iron. The films deposited at ...
The 21-hour LFM concentration includes four film courses, one film elective, and two English electives. Through coursework in film studies, students acquire skills in interpretation, analysis, and criticism; situate films within historical periods; consider the relation of film to literary texts; and study important film genres, directors, and ...
In this study, we characterized FeS 2 thin films grown by the non-vacuum spin-coating method. We annealed the samples under a sulfur atmosphere at different sulfurization temperatures. …
The transformation of pyrrhotite to Fe disulfide (pyrite and/or marcasite) under hydrothermal conditions was studied experimentally by probing the effects of temperature (up to 220 °C, vapor ...
The cubic FeS2 (Pyrite) films are prepared by chemical bath deposition method (CBD) at different iron ion precursor concentrations that varying from 2.0 M to 0.5 M. X-ray diffractograms revealed ...
concentrations of dissolved iron and lowered pH sufficiently to enable marcasite formation (Murowchick and Barnes 1987: Schoonen and ... polished to 0.1 mm on diamond-coated polishing film and examined by reflected-light microscopy with a high-power (100 3) oil-immersion ... Marcasite was detected in every black shale sample and is closely
Marcasite has a strong tendency to form simultaneously with pyrite upon sulfurization of amorphous iron-oxide precursor films, leading to a mixed-phase structure in …
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In this study, we characterized FeS 2 thin films grown by the non-vacuum spin-coating method. We annealed the samples under a sulfur atmosphere at different sulfurization temperatures. …
TY - JOUR. T1 - Enhanced Photoresponse of FeS2Films. T2 - The Role of Marcasite–Pyrite Phase Junctions. AU - Wu, Longfei. AU - Dzade, Nelson Y.
Marcasite has a strong tendency to form simultaneously with pyrite upon sulfurization of amorphous iron-oxide precursor films, leading to a mixed-phase structure in which pyrite grains …
By electrodeposition method, the nanostructured iron pyrite (FeS 2) films were deposited on the FTO substrate.X-ray diffraction (XRD) analysis showed the formation of cubic pyrite (FeS 2).Moreover, field emission scanning electron microscopy (FESEM) images showed that compared with the un-doped specimen, the morphology of the Sn-doped did not change in …
2 films with mixed pyrite-marcasite phase junctions prepared by sulfuriza-tion of sputtered Fe thin layers on highly doped Si wafers. The mixed phase films show highly improved photocur-rents at 0.5 V vs. Hg/Hg 2SO 4 of 4.30 mA cm−2 compared to 0.14 mA cm−2 of phase pure pyrite films. Apart from the con-
Film Concentration Electives. Students must dedicate three (3) of their MDST electives at the 3000-level or above to courses in which film is the main object of study. These may be chosen flexibly from offerings in Media Studies and the other UVa Departments that offer film courses. The following courses are pre-approved for this requirement.
presume that marcasite of mixed phase sample cannot be converted to pyrite on account of the low sulfurization concentration. The marcasite phase is known to have lamellae and to hinder the pyrite formation. Therefore, mixed-phase thin film shows unclear GBs. …
Arsenopyrite and marcasite of this study were obtained from Martinet skarn mineralization (eastern Pyrenees) and from the carbonate-hosted Zn-Pb deposits of Reocín (Cantabria, Spain), respectively. Some arsenopyrite and marcasite fragments were crushed in an agate mortar and sieved to a size fraction powder below 100μm. Initial
The structural and electro-optical influence of marcasite on the properties of solution-processed iron pyrite thin films was investigated. Marcasite has a strong tendency to form simultaneously with pyrite upon sulfurization of amorphous iron-oxide precursor films, leading to a mixed-phase structure in which pyrite grains are surrounded by ...
At high oxygen concentrations (e. g., atmospheric concentration) the reaction rate appears to be independent of dissolved oxygen (DO), becoming constant when DO >= 1 x 10(-4) M.
A thin film of marcasite, FeS2, was synthesized under vacuum and its structure and reactivity under oxidizing conditions was investigated by means of diffraction and surface …