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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 …
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In addition, the pyrite/marcasite film has been found to have a larger diffusion coefficient for photogenerated minority carriers than the phase-pure pyrite film from electrochemical impedance analyses, resulting in a higher photocurrent density, as determined through photoelectrochemical measurement. ... We prove that this low concentration of ...
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400 °C is optimal sulfurization temperature for pure pyrite FeS2 thin film, expecting better performance as light-absorber.
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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 ...
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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 …
WhatsApp: +86 18221755073
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 ...
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Li et al., found that they could control both the size and shape of their products by varying the concentration of FeCl 2 in their reaction. Low concentrations of FeCl 2 in oleylamine ... The asymmetrical groups gave mixed phase pyrite/marcasite films, whilst the use of dihexyldithiocarbamates led to a mixture of pyrite and pyrrhotite.
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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.
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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 ...
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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.
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Some pyrrhotite crystals are rimmed by thin marcasite films and penetrated by FeS 2 (marcasite ?) along the cleavage planes (Fig. 9). ... which occurs in concentrations ranging from 2.7 to 6.3 µg ...
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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. …
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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
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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 ...
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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 ...
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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.
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TY - JOUR. T1 - Enhanced Photoresponse of FeS2Films. T2 - The Role of Marcasite–Pyrite Phase Junctions. AU - Wu, Longfei. AU - Dzade, Nelson Y.
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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 …
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Thallium in hydrothermal systems is bound with sulphides, such as pyrite, sphalerite or marcasite. The ventilation of such sulphides results in the dissemination of thallium in sedimentary rocks and organic compounds. The concentration of thallium in igneous rocks ranges from 0.05 to 1.7 mg kg −1 (Lin and Nriagu 1998).
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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 …
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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 ...
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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.
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Moon et al. [20] studied the structural and electro-optical influence of m-FeS 2 on the properties of solution-processed p-FeS 2 thin films, the results indicate that m-FeS 2 should have a band gap of approximately 0.85–0.88 eV with a higher absorption coefficient than pyrite, and the pyrite/marcasite film have a larger photocurrent density.
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DOI: 10.1016/J.SOLENER.2017.11.026 Corpus ID: 104188191; Structural, optical and electrical impacts of marcasite in pyrite thin films @article{Moon2018StructuralOA, title={Structural, optical and electrical impacts of marcasite in pyrite thin films}, author={Dong Gwon Moon and Shanza Rehan and Soo Yeon Lim and Dahyun Nam and Il Wan Seo and Jihye Gwak and Hyeonsik …
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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.
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The cubic FeS 2 (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 that the presence of (110) plane, corresponding to marcasite structure, and (106) and (304) planes, corresponding to FeS (lite) phase are observed along with the …
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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. …
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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 ...
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Optical measurements of films rich in marcasite (orthorhombic FeS2) show that marcasite has a band gap at least as large as pyrite and that the two polymorphs share similar absorptivity spectra ...
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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
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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] .
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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 ...
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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 …
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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 ...
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