Results 91 to 100 of about 127 (124)
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Control of Pore Structure of Trioctahedral Magnesium-Smectite Materials
Chemistry Letters, 2000Abstract Micro-mesoporous smectite-type materials are prepared from water glass and magnesium chloride by a hydrothermal treatment and calcination without template materials. The addition of dialkyldimethyl ammonium chloride during or after the hydrothermal synthesis enlarged their pore volumes and mesopore sizes, due to changes in the ...
Masayuki Shirai +4 more
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Raman spectra and vibrational analysis of the trioctahedral mica phlogopite
American Mineralogist, 1999Raman spectra were measured and normal mode calculations were performed for phlogopite. Calculated fundamental mode frequencies were fit to observed frequencies assigned to features in the two polarized Raman spectra collected, so that unambiguous assignment of eigenmodes could be made to nearly all Raman spectral features.
David A. McKeown +2 more
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Comparative study of cesium adsorption on dioctahedral and trioctahedral smectites
Journal of Radioanalytical and Nuclear Chemistry, 2012Bentonites which are characterized by good rheological, mineralogical and chemical stability is considered used as sealing barriers in multibarrier Slovak system of deep geological repository for high-level radioactive waste and spent nuclear fuel.
M. Galamboš +5 more
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Infrared Evidence of Dioctahedral-Trioctahedral Site Occupancy in Palygorskite
Clays and Clay Minerals, 2002AbstractA Mg-rich palygorskite sample from phosphorite deposits of Ganntour (Morocco) with the structural formula Si8(Mg2.6Al1.19Fe0.33III□0.88)Ca0.056Na0.024K0.104O20(OH)2(OH2)4⋅4H2O, was studied by FTIR spectroscopy. In both OH-stretching and OH-bending regions, there is evidence of dioctahedral Al2□OH, AlFe□OH and trioctahedral Mg3OH features ...
A. Chahi, S. Petit, A. Decarreau
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Application of chemical geothermometry to low-temperature trioctahedral chlorites
Clays and Clay Minerals, 2009AbstractLow-temperature chlorites formed in diagenetic to low-grade metamorphic environments generally have greater Si contents and larger numbers of octahedral vacancies, and smaller Fe+Mg contents than higher-grade metamorphic chlorites. The compositional variations are characterized approximately by four end-member components: Al-free trioctahedral ...
Inoue, Atsuyuki +5 more
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Evidence for the Formation of Trioctahedral Clay upon Sorption of Co2+ on Quartz
Journal of Colloid and Interface Science, 1999The sorption mechanism of Co on quartz at room temperature has been investigated by an in-depth analysis of published extended X-ray absorption fine structure (EXAFS) spectroscopy and solution chemistry data. In particular, the 3.5-5 Å mid-range atomic environment of Co has been determined with unprecedented precision by combining ad initio FEFF7.02 ...
, Manceau, , Schlegel, , Nagy, , Charlet
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Crystal Chemical Models on Trioctahedral and Dioctahedral Micas
2005nd
BRIGATTI, Maria Franca +5 more
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Hydrothermal synthesis of a Cs ferruginous trioctahedral mica
1998Hydrothermal experiments aimed at the synthesis of trioctahedral ferruginous Cs micas were carried out at 100 MPa and a constant temperature in the range 500-710 degrees C or in a temperature gradient. Starting mixes consisted of SiO(2), Fe(2)O(3), Al(2)O(3), Cs(2)CO(3); there was excess water in all runs, and in some runs also an excess of CsOH or Cs ...
DRABEK, M. +4 more
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Crystal chemistry of Ba-rich trioctahedral micas-1M.
1993Ten single-crystal X-ray structure refinements of igneous and metamorphic Ba-bearing micas were determined to define the exchange vectors required to compensate for the excess in positive layer charge caused by [XII]Ba2+ for [XII]K+ substitution. The determined exchange vector is BaAlK−1Si−1.
BRIGATTI, Maria Franca, POPPI, Luciano
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