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Browsing ELibrary by Title
Now showing items 11166-11185 of 21821
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(2004)The main objective of this paper is to apply an NMR-based methodology to clay minerals that provides resolution enhancement in 27Al NMR spectra, permitting the differentiation of aluminum ions with one same coordination ...
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(2001)A series of 21 cordierites with 0.06<Fe2+ cations pfu <1.54 from different petrogenetic environments were studied by polarized electronic absorption single-crystal spectroscopy and 57Fe Mssbauer spectroscopy (MS). The ...
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(2001)A series of 21 cordierites with 0.06<Fe2+ cations pfu <1.54 from different petrogenetic environments were studied by polarized electronic absorption single-crystal spectroscopy and 57Fe Mssbauer spectroscopy (MS). The ...
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(1997)The geochemistry of Co at the Earth's surface is closely associated with that of man- ganese oxides. This geochemical association results from the oxidation of highly soluble Co21 to weakly soluble Co31 species, coupled ...
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(2003)Phase transitions in the BaAl2O4-SrAl2O4 solid solution have been analysed as a function of temperature and composition using infrared (IR) powder absorption spectroscopy. The improper ferroelectric phase transition P6322 ...
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(1987)Data is presented on the behavior of natural natrolite Na 2Al 2Si 3O 10·2H 2O from the Kola Peninsula under hydrostatic pressures of up to 50 kbar at room temperature. We studied transparent colorless prismatic monocrystalline ...
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(2004)The Zilair Synclinorium is one of the largest structural units on the western slope of the southern Ural. In the west, its northern and southern parts join the Bashkir Anticlinorium and the Ural Foredeep, respectively. In ...
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(1999)Several minerals and inorganic compounds contain (XA 4) tetrahedra, with anions, X (O 2– , N 3– , and F –), as central atoms and cations, A (Cu 2+ , Zn 2+ , Pb 2+ , Bi 3+ , REE 3+ , etc.), as ligands. These tetrahe-dra are ...
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(1988)Much attention has recently been paid to the structure of kimberlite fields at different crustal levels. Here we try, from the results of mass logging of wells drilled in the Malaya Botuobuya district, to clarify whether ...
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(2001)The sequential displacement mechanism based on the oxygen-lattice cubic closest packing (c.c.p.) in the <2 0 1> direction was proposed in this study. All displacements of cations are within the OT and the O layers with the ...
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(2001)Seismic activity in southern Sakhalin is related to zones of submeridionally striking faults (upthrow and normal faults) separating ridges and intermountain depressions, and transorogenic faults of the NW (sinistral ...
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(2002)Ten hausmannite crystals (from Ilfeld and Friedrichrode, Harz, Germany), belonging to the (Mn1-xZnx)Mn2O4 (O ≤ × ≤ 0.26) system (141/amd hausmannite structure type), were characterized by chemical (electron microprobe) and ...
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(2002)Mn K-edge EXAFS spectroscopy of solid-solution samples encompassing the complete MnCO3-CaCO3 series shows that first-shell Mn-O distances deviate little from the 2.19-A distance observed in pure MnCO3. Very slight lengthening ...
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(1995)Ab initio, molecular orbital calculations of the structures, energetics, and vibrational spectra of six T2Obr-CO2 clusters and five T-[CO3]-T clusters (T = Al or Si, with and without Na+ present) have been completed using ...
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(2002)Trioctahedral ferromagnesium micas from the Archaean amphibolites of the Kola super-deep borehole (KSDB-3) complex have been compared with those from analogous Archaean surface rocks in an integrated study of their chemical ...
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STRUCTURAL STUDY OF MAGNESIOAXINITE AND ITS CRYSTAL-CHEMICAL RELATIONS WITH AXINITE-GROUP MINERALS (2000)The magnesium end-member of the axinite mineral group was studied by single-crystal X-ray diffraction and refined in the P1 space group (R = 2.2 %). Cell parameters are a = 7.1381(3) Å, b = 9.1626(4) Å, c = 8.9421(4) Å, α ...
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(2000)The structural transformation of dioctahedral 2:1 layer silicates (illite, montmorillonite, glauconite, and celadonite) during a dehydoxylation-rehydroxylation process has been studied by X-ray diffraction, thermal analysis, ...
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(1996)In following up a recent proof of a structural substitution of octahedral FeIII by VIII and CrIII in synthetic goethite, the same substitution was now recorded in goethites and hematites from lateritic crusts. Substitution ...
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(2000)
Now showing items 11166-11185 of 21821