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Browsing ELibrary by Title
Now showing items 13848-13867 of 21768
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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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(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 ...
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(1997)The standard form of the Scherrer equation, which has been used to calculate the mean thickness of the coherent scattering domain (CSD) of illite crystals from X-ray diffraction (XRD) full width data at half maximum (FWHM) ...
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(1998)A modified version of the Bertaut-Warren-Averbach (BWA) technique (Bertaut 1949, 1950; Warren and Averbach 1950) has been developed to measure coherent scattering domain (CSD) sizes and strains in minerals by analysis of ...
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(2002)Carbonate rocks frequently contain some silicate minerals and various xenoliths. Calcareous mudstone is also widely distributed. There is no report of practical analytical method of mixtures of silicate and carbonate by ...
Now showing items 13848-13867 of 21768