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Browsing ELibrary by Title
Now showing items 11382-11401 of 21768
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(2003)Real-time, temperature-resolved synchrotron powder X-ray diffraction data and Rietveld refinements were used to investigate the behavior of the todorokite structure from 100 to 820 K. At 298 K, the lower valence cations, ...
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(2000)Material properties are dependent upon atomic arrangement. The structure provides a basis for calculation and for the interpretation of experiment. In the Earth context, mineral structure is composition, pressure and ...
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(2004)The structure of shafranovskite, ideally K2Na3(Mn,Fe,Na)4[Si9(O,OH) 27](OH)2·nH2O (n ∼ 2.33), a K-Na-manganese hydrous silicate from Kola peninsula, Russia, was studied using synchrotron X-ray radiation and a MAR345 ...
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SYNCHROTRON X-RAY POWDER DIFFRACTION STUDY OF NATURAL P2 /N-OMPHACITES AT HIGH-PRESSURE CONDITIONS (2001)Synchrotron X-ray powder diffraction experiments at high pressure conditions (0.0001-13 GPa) were performed at ESRF (Grenoble-F), on the beamline ID9, to investigate the bulk elastic properties of natural P2/n-omphacites, ...
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(2000)The synchrotron-XRF microprobe set-up at HASYLAB, DESY (Deutsches Elektronen-Synchrotron, Hamburg, Germany) has been evaluated in terms of accuracy and precision of trace-element analysis using a standard-free fundamenta ...
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(1990)The synergetic principle of the generation of prognostic solutions that are unaffected by stimuli was the basis for the Objective Forecast man-machine system that we developed. This system converts digital matrices of video ...
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(2004)The study of synmetamorphic granites of the Ol'khon collisional system revealed the abundance of injection veins, dikes, and intrusions. Their emplacement was controlled by ductile strikeslips that postdate and occasionally ...
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(2001)The stratigraphic record, distribution and composition of the selachian genus Lissodus is briefly reviewed. 38 species are currently recognised, with 26 further records not designated to species level. Teeth of the genus ...
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(1989)Carbonization, a recently established new type of hydrothermal metasomatic alteration, leads to enrichment of elastic rocks in carbonaceous matter on the flanks of mineralized (primarily gold) zones, as well as in the ...
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(2002)Birnessite can be used as a precursor in the preparation of manganese oxides. Synthesis of pure birnessite is difficult because of a side reaction, which yields hausmannite. This study aimed to develop a modified ...
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(1999)A series of novel inclusion compounds with compositions of RE(HCO2)3(HNO2)(H2CO2) (RE = Y, Tb, Dy, Ho, Er, Yb, Tm) were synthesized and structures were characterized by X-ray methods. The orthorhombic structure was shown ...
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(2004)During investigations of the system Sc2O3-Al2O3-TiO2-SiO2, a new, unusual microporous compound, Cs3ScSi8O19, was synthesized as colourless plates from a CsF-MoO3 flux. The crystal structure was determined from single-crystal ...
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(2005)This paper reports the results of hydrothermal synthesis in the system Na2O-MgO-FeO-Fe2O3-SiO2-H2O. Four samples of stoichiometric magnesioriebeckite composition, ideally □Na2Mg3Fe3+2 Si8O22(OH)2, were run at 700–800 °C, ...
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(1990)The present work, we synthesized germanium-containing quartz crystals from 0.5N NaOH solutions by the thermal gradient method, at crystallization temperatures from 270° to 670°C and a pressure of 1.6 kbar. The experiments ...
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(1990)One of the unsolved problems of experimental mineralogy is the synthesis of single crystals of anadalusite. Because of the geochemical similarity of aluminum to gallium, and of silicon to germanium. This permits the use ...
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(2001)Weathered and sedimentary rocks (bauxites, clays, etc.) are promising but poorly investigated and rarely used sources of REE. These rocks are characterized by very low contents of rare-metal minerals in contrast to relatively ...
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(2004)Beryllium is a significant constituent in sapphirine in some metamorphic and pegmatitic rocks, and thus could have a major effect on its stability relationships. Using the stoichiometries of reactions involving sapphirine ...
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(2002)Beryllian sapphirine Mg4−xAl4+x[Al4+x−2yBeySi2−x+yO18]O2 has been synthesized from starting compositions with y ≤ 1 at x = 0 and y ≤ 0.5 at x = 0.5, P = 0.1–1.3 GPa, T = 700–1350 °C. Electron diffraction shows the sapphirines ...
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(2004)An O2 oxidation and freeze-dry procedure has been used to synthesize birnessite through the oxidation of Mn2+ in alkali media. The effects of O2 flow rate, the fluxion velocity of reaction suspension, the reaction temperature, ...
Now showing items 11382-11401 of 21768