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Browsing ELibrary by Title
Now showing items 13966-13985 of 21934
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WITTITE WITH SE-RICH COSALITE AND BISMUTHINITE FROM NEVSKOE TIN DEPOSIT (MAGADAN DISTRICT, RUSSIA) (1992)A second confirmed occurrence of wittite, one of the four known Pb-Bi-Se-sulfosalts, has been found in the Nevskoe tin deposit (Eastern Siberia). Microprobe analyses of wittite show pronounced variation of Se content (from ...
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(1988)Processes that alter wolframite already begin under endogene conditions, almost immediately after its crystallization from hydrothermal solutions, and lead to its total breakdown or replacement at that time or later in the ...
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(2000)Measurements of the dissolution rates of wollastonite in solutions with pH ranging from 2 to 6 in an externally recycled mixed flow reactor show that the concentrations of Ca and Si in the reactor effluent decline with ...
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(2002)X-ray absorption fine structure (XAFS) measurements was used at the U L3-edge to directly determine the pH dependence of the cell wall functional groups responsible for the absorption of aqueous UO22+ to Bacillus subtilis ...
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(2003)X-ray absorption fine structure (XAFS) spectroscopic analysis at the As, Se, and Mn K-edges was used to study arsenate [As(V)O-4(3-)] and selenite [Se(IV)O-3(2-)] sorption complexes on the synthetic hydrous manganese oxides ...
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(1999)Sorption processes typically control trace metal concentrations in aquatic systems. To illustrate the impact of various types of surface sites on metal ion sorption behavior, Co(II) and Sr(II) sorption by several clay ...
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(2003)We present X-ray absorption near-edge structure (XANES) spectroscopy of 11 silicate and aluminosilicate minerals and two glasses at the SiK and SiL2,3, and OK edges. The similar nearest-neighbor environments lead to similar ...
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(2002)X-ray absorption spectroscopy (XAS) has developed into a powerful tool for the study of all types of materials since the early 1970s, when strong sources such as synchrotrons became available from which experimental spectra ...
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(2002)We report results from in situ extended X-ray absorption fine structure (EXAFS) spectroscopy studies of Cu(II) and Zn(II) complexes forming at the calcite surface following adsorption from preequilibrated calcite-saturated ...
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(2000)Sulfate is one of the most abundant inorganic ligands in the lithosphere and hydrosphere. It plays a major role in mediating mineral dissolution and precipitation, crystal growth, mineral–water and air–water interfacial ...
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(2004)The high-pressure behaviour of millerite NiS up to 34.7 GPa was studied using single-crystal X-ray diffraction techniques. Under ambient pressure, 8.3, 19.2 and 26.8 GPa crystal-structure determinations were performed. No ...
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(2002)We synthesized compounds with stoichiometry of natural brabantite M2+Th(PO4)2 with M2+=Ca, Cd, Sr, Pb, Ba at 1 bar, 1200 °C and 2.5 kbar, 700 °C. Those compounds were studied by powder X-ray diffraction and electron ...
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(1995)Angle resolved X-ray photoelectron spectroscopy (ARXPS) of air-oxidized pyrrhotite (Fe7S8) surfaces reveals two distinctive compositional zones. The outer most zone is composed of iron oxyhydroxide, whereas the underlying ...
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(2000)Polished albite single crystals were dissolved in flow or semi-batch reactors containing solutions at pH 2.9+/-0.1 at 5°, 50°, and 90°C until steady state dissolution was achieved. At steady state, all effluent solutions ...
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(2006)Cleaved surfaces of dolomite were studied using ex-situ X-ray photoelectron spectroscopy (XPS) following exposure of the surfaces to various experimental conditions. Dolomite samples exposed to air, to a highly undersaturated ...
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(1995)Samples of natural pyrrhotite and pyrite were fractured within the analytical chamber of an X-ray photoelectron spectrometer. The pristine mineral surfaces were then exposed, in the absence of oxygen, to total doses of ...
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(2001)The crystal structure of intermediate incommensurate tridymite was refined at 150 °C from powder data. Upon cooling from above 220 °C, the basic structure with space group symmetry C2221 gradually distorted from orthorhombic ...
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(2002)Two MgAl2O4 stoichiometric spinel crystals, one natural and one synthetic, were heated from 25 to 950 °C and studied in situ by single-crystal X-ray diffraction. The natural crystal, quenched from 850 °C, was further ...
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(2002)The first direct measurements are reported for the structure of the hydrated La3+ ion in an aqueous solution (containing 0.007 m La) over a range of temperatures from 25 to 300degreesC and pressures LIP to 1600 bars. The ...
Now showing items 13966-13985 of 21934