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Now showing items 16912-16931 of 39124
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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 ...
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(2002)With a penetration depth ranging from microns to millimeters, Ångstrom-wavelength X-rays are an ideal probe for studying atomic-scale buried structures found in the natural environment, such as impurities in minerals and ...
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(1999)The location and orientation of arsenite incorporated at the CaCO3 (1014) cleavage surface from a dilute aqueous solution was examined with the X-ray standing wave (XSW) technique. The high coherent fractions measured for ...
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(1989)We experimentally studied the solubility of titanium in a basalt melt at 1200° to 1300° C both in air (pO 2 = 0.21) and in a helium atmosphere. In the latter case, we determined the partial pressure of oxygen which, depending ...
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(2003)Fe K-edge X-ray absorption near edge structure (XANES) spectra were recorded for a series of anorthite-diopside eutectic glasses containing 1 wt% 57 Fe2O3 quenched from melts equilibrated over a range of oxygen fugacities ...
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(2003)The presence and localization of organic sulfate within coral skeletons are studied by using X-ray absorption near edge structure spectroscopy (XANES) fluorescence. XANES spectra are recorded from four reference sulfur-bearing ...
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(1995)Isotopic distributions of pure solar-wind xenon and krypton are derived from an extensive data base of xenon and krypton compositions evolved from lunar and meteoritic regolith samples by acid-etching or combustion-pyrolysis ...
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XES-XEN ВОЗРАСТ ДВУХ ОБРАЗЦОВ ЦИРКОНА ИЗ НЕЙПИРСКОГО КОМПЛЕКСА (ЗЕМЛЯ ЭНДЕРБИ, ВОСТОЧНАЯ АНТАРКТИДА) (2003)Целями работы было: 1) исследование возможности применения Хе-Хе метода изотопной геохронологии для датирования древних (первичных) событий в истории докембрийских высокометаморфизованных пород, в которых наложенные процессы ...
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(Федеральное государственное бюджетное учреждение науки «Геологический институт Российской академии наук», 1989)
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(2004)XPS measurements have been made of vacuum-fractured monoclinic pyrrhotite and troilite that highlight sulfur coordination (S 2p) and iron electronic state (Fe 2p) differences between these two minerals as a result of iron ...
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(2000)The adsorption of three anions (AsO43-, PO43-, and CrO42-) and two cations (Zn2+ and Pb2+) has been determined on a new form of amorphous black ferric oxyhydroxide that resembles in local structure β-FeOOH, akaganeite. The ...
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(2001)The present study is an investigation into the surface reactions of synthetic birnessite [Mn(II)0.05Mn(III)0.25Mn(IV)0.7O1.7(OH)0.25] when reacted with dilute (5 × 10−4 M) Na-humate solution using X-ray Photoelectron ...
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(1998)Reductive dissolution of synthetic birnessite (MnO1.7(OH)0.25 or MnO1.95) by arsenious acid (H3AsO3) proceeds in two steps. The first entails reduction of Mn(IV) to Mn(III), with stoichiometry: 2MnO2+H3AsO3=2MnOOH*+H3AsO4H3AsO3 ...
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(2000)The present study is an investigation into the surface reactions of synthetic birnessite [Mn(II)0.05Mn(III)0.25Mn(IV)0.7O1.7(OH)0.25] when reacted with dilute (5 × 10−4 M) Na-humate solution using X-ray Photoelectron ...
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(1999)Reductive dissolution of synthetic 7#9-birnessite [MnO1.7(OH)0.25 or MnO1.95] by Na-oxalate produces a Mn(III) intermediate reaction product (here represented as MnOOH*) which subsequently reacts with sorbed (COO)2-2 to ...
Now showing items 16912-16931 of 39124