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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 …
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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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Marcasite jewelry is jewelry made from pyrite, or fool's gold. Marcasite itself, a mineral in its own right, is too brittle to be used in jewelry. Marcasite jewelry upkeep depends on good day-to-day habits, but when a full cleaning is in order, it's important to take the correct steps to avoid doing more harm than good to this fragile stone.
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Marcasite (FeS 2) is widespread in nature, its oxidation plays a vital role in acid mine drainage, mineral resource recovery, and photoelectric material applications. …
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Concentration of the polysulfide impurity on the thin films appears to be significantly less than the same species on cleaved marcasite samples reported on in prior work in another laboratory. Even though the thin film had a low density of nonstoichiometric species, such as S 2−, it showed significant oxidation in a H 2 O/O 2 environment.
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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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Central Wales Orefield: marcasite is widespread as a late-stage mineral in the polyphase lodes of this area and was in fact worked in a limited manner as 'pyrites', for sulphuric acid manufacture (Jones, 1922). As a late-stage mineral it often net-veins earlier mineralization (Mason, 1994, 1997): this contamination affected some lead-zinc ores so badly as to …
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Marcasite Meanings, Zodiacs, Planets, Elements, Colors, Chakras, and more. Science & Origin of MarcasiteMarcasite is an Iron oxide that has the exact same chemical makeup of @Pyrite@, but forms in a completely different crystal structure. Unlike Pyrite, Marcasite does not exhibit a cubic identity, instead, it crystallizes in a variety of other forms, such …
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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 …
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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 …
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This study evaluated the oxidation of research-grade marcasite and pyrite in shake flask experiments using iron-oxidizing bacteria and archaea at 22, 45, and 65 °C. Dissolved iron concentration and pH were monitored at intervals. The results showed that marcasite was more reactive than pyrite to both microbiological and chemical oxidation.
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The molecular formula of marcasite is FeS 2, and marcasite belongs to an orthorhombic crystal system with a space group of Pnnm.Its unit cell model is shown in Fig. 1.Fe atoms are located in bulk center and at eight top corners of the unit cell; each Fe atom is coordinated with six neighboring S atoms, and each S atom is coordinated with three …
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What is Marcasite Jewelry? Marcasite is made out of brittle and brassy colored metallic stones called pyrite, also known as Fool's Gold. Pyrite is a gemstone that's very similar looking to gold but can also be darker and metallic looking like the marcasite gemstone. The tiny pieces of marcasite are used in silver jewelry to create iconic ...
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Despite the natural abundance of pyrite and marcasite and their intergrowth, and a wealth of information they can provide on the physical–chemical conditions of mineral deposits, a complete mechanistic and kinetic study on the phase transformation from the thermodynamically metastable polymorph marcasite to the stable polymorph pyrite is …
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At high oxygen concentrations (e.g., atmospheric concentration) the reaction rate appears to be independent of dissolved oxygen (DO), becoming constant when DO 1 10 4 M. ... Elsetinow et al. (2003) investigated a synthetic thin film of marcasite by means of XPS and AFM (Atomic Force Microscope) and found that the S2p spectral region was ...
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Marcasite frequently occurs as twinned, dipyramidal, orthorhombic crystals with coxcomb or spear-like habits. With its weak atomic bonding, marcasite is unstable and susceptible to rapid oxidation, especially in wet or humid conditions. It eventually oxidizes into melanterite (FeSO4·7H20), a crumbly, yellowish-white hydrous iron sulfate.
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The carrier concentration of the thin films annealed at 400 °C is higher due to containing a small quantity of marcasite with a band gap E gd = 0.34 eV than the thin films annealed at 500 °C with a single-phase pyrite. The Hall mobility increases markedly with the rising of annealing temperature below 500 °C and a slow decrease above 500 °C.
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The same analysis for the film sample with B → 0 and at T = 373 K gives n film = 1.95 × 10 20 cm −3 and μ film = −90 cm 2 V −1 s −1; and at T = 469 K, n film = 3 × 10 20 cm −3 and ...
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Solar energy is the extreme realistic solution to regularly growing energy crisis. Several solar energy conversion systems have been in harnessing into useful form of energy. The performance of solar energy devices depends on the properties of nanomaterial used for solar energy conversion. As the primary sources of energy are …
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Geologic Occurrence of Marcasite. Most marcasite forms in one of three ways: 1) as a primary sedimentary mineral; 2) as a product of low-temperature hydrothermal activity; and, 3) as a secondary mineral that forms during the alteration of other sulfides such as pyrrhotite or chalcopyrite.Most conditions of marcasite formation are at relatively low …
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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 …
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Marcasite is a gemstone that requires extra attention to care and cleaning than others. Marcasite gems can tarnish when exposed to high humidity, so it's best to not submerge the stone in water or use steam cleaners and boiling methods. Harsh chemicals can dull the shine of marcasite. To clean marcasite, gently wipe with a very soft, damp cloth.
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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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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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We have measured the uranium and thorium concentrations in lorandite, realgar and marcasite samples from the mine by observing fission fragments produced in neutron induced fission. The fragments were recorded in Makrofol KG film and the measurement technique has a good level of sensitivity. Excellent discrimination against …
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This article reports on in situ and ex situ experiments on the phase transformation from marcasite to pyrite, the two polymorphs of FeS 2. The …
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Marcasite is a brassy yellow gemstone with a brilliant metallic luster. The stone is quite similar to pyrite, with only a few notable differences but lots of intertwined history.. Throughout the years, …
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Marcasite is a stone that is chemically the same as Pyrite, but the two stones differ by their crystalline structures. It is a pale yellow color to almost white and has a bright metallic luster. Marcasite tarnishes to yellowish or brownish color and gives a black streak. It has a Mohs hardness of 6-6.5. How to Use Marcasite: Use as appropriate.
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In this study, we report experimental results on the effects of the marcasite on the structural and opto-electrical properties of solution-processed iron pyrite thin films to provide more complete insight into the role of marcasite.
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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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The phase transformation from marcasite-containing pyrite to pure pyrite occurs between 350 and 400 °C. The structural phase formation on the films depends on the sulfurization...
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The film deposited at AC < 14 M concentration showed pyrite as well as marcasite phases while the films that were grown at 14 M had only pyrite phase with cubic structure. The later films showed uniform and better surface morphology compared to the films formed at concentrations lower than 14 M. The EDAX analysis revealed the …
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Marcasite Stone has a high vibrational energy that needs clearing, cleansing, and replenishing its energies. Cleansing and recharging it using a smudging ritual by burning sage and letting the smoke over the …
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Marcasite in Jewelry Design Marcasite is a complementary element of many designs. Many feature white-hued metals like silver, sterling silver, gold, or polished steel. The color contrast it makes is distinctive and charming. Pairing pure gold and marcasite is pretty rare. Both are fairly delicate and easy to damage.
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Genuine marcasite comes from the mineral pyrite, which is a beautiful, metallised stone similar in appearance to gold which is why it is often referred to as 'Fools Gold'. The basic composition of pyrite is iron sulphide, but true marcasite has to be white iron sulphide based. It has a cubic or 'pyritohedral' structure, meaning it has ...
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For marcasite, when HNO 3 concentration was 1 M, only 18% of the marcasite was decomposed in 10 min. With an increase in HNO 3 concentration to 3 M, marcasite could be approximately fully decomposed in the same leaching time.. When compared to pyrite, it was demonstrated that marcasite was much more readily …
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