Results 61 to 70 of about 18,694 (284)
Decoding Variants of Pyrite, Arsenopyrite, and Marcasite Using an Electron Counting Rule
Angewandte Chemie International Edition, EarlyView.A new ‘structure determining electron’ (SDE) rule allows identifying marcasite (M), arsenopyrite (A), and pyrite (P) related compounds based on the electron distribution around transition metals. It offers a framework for categorising structural variants as compounds with M, A, and P layers. Nine new ternary representatives, including the first to show
Kristian Witthaut +2 more
wiley +1 more source
Meitan kexue jishu, 2023 The No. 9 coal of Yunjialing Coal Mine in Handan Coalfield, which is subject to obvious magmatic intrusion, is taken as the research object. Optical microscope observation, electron probe energy spectrometry (EPMA-EDS), X-ray diffractometer (XRD), X-ray ...
Zhiyong WANG +6 more
doaj +1 more source
Sequential Polymerization of Nitrogen at High Pressures
Chemistry–Methods, EarlyView.Polynitrogen anions, including N2, N4, N6 rings, N18 rings, and N chains, form under high pressure. These anions exhibit unique bonding structures that are stabilized in such conditions. Detailed information regarding their formation and properties is available in the article.
Huawei Chen +2 more
wiley +1 more source
The effect of adsorbed lipid on pyrite oxidation under biotic conditions
Geochemical Transactions, 2006 The chemolithoautotrophic bacterium, Acidithiobacillus ferrooxidans, commonly occurs in acid mine drainage (AMD) environments where it is responsible for catalyzing the oxidation of pyrite and concomitant development of acidic conditions.
Strongin Daniel R +4 more
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An experimental and computational investigation of structure and magnetism in pyrite Co$_{1-x}$Fe$_x$S$_2$: Chemical bonding and half-metallicity [PDF]
Phys. Rev. B 70 (2004) 214409(1-8)., 2004 Bulk samples of the pyrite chalcogenide solid solutions Co$_{1-x}$Fe$_x$S$_2$ 0 <= x <= 0.5, have been prepared and their crystal structures and magnetic properties studied by X-ray diffraction and SQUID magnetization measurements. Across the solution series, the distance between sulfur atoms in the persulfide (S$_2^{2-}$) unit remains nearly constant.
arxiv +1 more source
ON THE ESTIMATION OF SULPHUR IN PYRITES. [PDF]
Journal of the American Chemical Society, 1896 n ...
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ChemPlusChem, EarlyView.First analytical evidence and replication of yet undescribed substantial change in gilding technology in the early modern period ‐ the replacement of imported red clay (bole) with locally available bauxite. Proof of its source ‐ Croatian Minjera, according to a unique find of mineral diaspore.
David Hradil +3 more
wiley +1 more source
The Scientific World Journal, 2013 Acidithiobacillus ferrooxidans (A. ferrooxidans) was applied in coal biodesulfurization and coal’s pyrite bioleaching. The result showed that A. ferrooxidans had significantly promoted the biodesulfurization of coal and bioleaching of coal’s pyrite ...
Fen-Fen Hong +5 more
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Yankuang ceshi, 2018 BACKGROUND Microscopy and Electron Microprobe are the main methods for the study of gold-bearing minerals. Using these methods, the content and morphology of gold-bearing minerals and their spatial relationship with other minerals were studied in the ...
JING Guo-qiang +4 more
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Preview, 2019 Non omne quod fulget est aurumThis medieval Latin caveat was used by William Shakespeare in 1596 in the Merchant of Venice (Act 2, Scene 7): and by Miguel de Cervantes in 1615 in his Don Quixote (P...
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