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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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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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The name marcasite has a long history of being used as a generic term to describe any yellow-brown iron sulfide. Walter Pope, a celebrated English astronomer, is credited with observing in 1655 marcasites and stones containing flecks of gold in the mercury ores of the Idrija Mine in the Julian Alps of Slovenia. These flecks of gold turned …
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The beneficial role of marcasite in iron-sulfide-based photo-electrochemical applications is reported for the first time. A spectacular improvement of the …
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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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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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The structural and electro-optical influence of marcasite on the properties of solution-processed iron pyrite thin films was investigated. Marcasite has a strong …
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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 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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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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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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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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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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What Is Marcasite Jewelry? Marcasite jewelry is any jewelry piece made out of the brittle, brassy-colored metallic stone called pyrite, a.k.a Fool's Gold (more on this confusion between marcasite …
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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 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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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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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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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 …
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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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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).
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Marcasites qualify eminently for yet another revival and have recently been seen in more movies and on celebrities. Although marcasite jewelry never entirely lost its classic fashion status, it is now more popular than ever with fashion followers as well as collectors than just a few years ago. ... concentration intent, looking very much the ...
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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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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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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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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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Hydrothermal synthesis experiments were performed in order to quantify the states of Au and As in pyrite and marcasite. The experiments were performed at 350 °C/500 bar and 490 °C/1000 bar (pyrite–pyrrhotite buffer, C(NaCl) = 15 and 35 wt.%). The synthesis products were studied by EPMA, LA-ICP-MS, and EBSD. The EPMA was …
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