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Phase Transformations Associated with Thermal Decomposition of Duthuni Kaolin, South Africa
Phase Transformations Associated Thermal Decomposition Duthuni Kaolin South Africa
2012/3/14
Phase Transformations Associated with Thermal Decomposition of Duthuni Kaolin, South Africa.
Structural Transformations of Interstratified Illite-Smectites from Dolná Ves Hydrothermal Deposits: Dynamics and Mechanisms
Cis-octahedron Illite-smectite Illitization Phase Transformations Trans-octahedron
2011/12/23
Abstract: Structural transformations of illite-smectite samples of hydrothermal genesis with increasing contents of illite layers were studied by X-ray powder diffraction. The samples were K-saturated...
An Improved Model for Structural Transformations of Heat-Treated Aluminous Dioctahedral 2:1 Layer Silicates
Beidelites Cis-vacant octahedra Dehydroxylation Illites Montmorillonites Trans-vacant octahedra
2011/12/28
An improved model for the interpretation of thermal effects during dehydroxylation in aluminous dioctahedral 2:1 layer phyllosilicates considers trans-vacant (tv) and cis-vacant (cv) 2:1 layers and le...
Transformations of Synthetic Birnessite as Affected by pH and Manganese Concentration
Birnessite Manganese oxides Mn2+ concentration pH Structural conversion TEM XRD
2011/12/29
The amount of Mn2+ adsorbed or removed from solution by birnessite is several times greater than its reported cation exchange capacity. Extractability of the sorbed Mn2+ decreases with aging. It is un...
Diagenetic Structural Transformations in North Sea Jurassic Illite/Smectite
Chemical composition Diagenesis Illite/smectite Mossbauer spectroscopy Nuclear magnetic resonance X-ray powder diffraction
2011/11/30
Abstract: The Kimmeridgian-Volgian(-Ryazanian) claystone is the principal oil source rock in the troughs of the North Sea. Randomly (R0) ordered mixed-layer illite/smectite (I/S) appears to have trans...
The Structure and Thermal Transformations of Allophanes Studied by 29Si and 27Al High Resolution Solid-State NMR
Allophane ?Imogolite ?Dehydroxylation ?Crystal structure ?Nuclear magnetic resonance ?Thermal treatment ?X-ray powder diffraction
2011/12/31
Examination of two volcanic and two precipitated allophanes by solid-state NMR, thermal analysis and X-ray powder diffraction shows three of the samples to contain structural features similar to both ...
High-Resolution Transmission Electron Microscopy Study of Mn-Oxyhydroxide Transformations and Accompanying Phases in a Lateritic Profile of Moanda, Gabon
Energy-dispersive X-ray analysis Hausmannite High-resolution transmission electron microscopy Laterite Manganese Manganite Pyrolusite Topotactic transformation
2011/12/31
Unheated natural mixtures of manganite and secondary pyrolusite, from the same lateritic manganiferous sequence, were studied in different orientations by high-resolution transmission electron microsc...
Catalysis of Nontronite in Phenols and Glycine Transformations
Catalysis Deamination Decarboxylation Glycine Nontronite Phenol Polycondensation
2011/12/31
The catalytic power of Ca-nontronite (0.2? 祄) for the polycondensation of phenols and glycine and the associated reactions that involve the ring cleavage of phenols and the decarboxylation and deamina...
Pyrogallol Transformations as Catalyzed by Nontronite, Bentonite, and Kaolinite
Bentonite Catalysis Humic polymers Infrared spectroscopy Kaolinite Nontronite Nuclear magnetic resonance Pyrogallol
2012/1/9
The catalytic power of Ca-nontronite, Ca-bentonite, and Ca-kaolinite in promoting the abiotic ring cleavage of pyrogallol (1,2,3-trihydroxybenzene) and the associated formation of humic polymers was s...
Structure and Thermal Transformations of Imogolite Studied by 29Si and 27Al High-Resolution Solid-State Nuclear Magnetic Resonance
Aluminosilicate gel Crystal structure Dehydroxylation Imogolite Nuclear magnetic resonance Thermal treatment X-ray powder diffraction
2012/1/5
Solid-state nuclear magnetic resonance (NMR) spectroscopy, thermal analysis, and X-ray powder diffraction data on the tubular, hydrous aluminosilicate imogolite were found to be fully consistent with ...
Ion Exchange, Thermal Transformations, and Oxidizing Properties of Birnessite
Birnessite Bixbyite Buserite Cation exchange Cryptomelane Hausmannite Hollandite Oxidation Thermal treatment
2012/1/12
Synthetic sodium birnessite, having a cation-exchange capacity (CEC) of 240 meq/100 g (cmol/kg) was transformed into Li, K, Mg, Ca, Sr, Ni, and Mn2+ cationic forms by ion exchange in an aqueous medium...
Mineralogical Transformations during Weathering of Lignite Overburden in East Texas
Lignite Oxidation Reclamation Smectite Soil Weathering
2011/11/25
Abstract: Mineralogical weathering sequences in sediments overlying lignite beds were investigated in a core (27 m deep) from Calvert, Robertson County, northeast Texas. Weathering trends were evaluat...
Fe2+-Fe3+ Transformations in Clay and Resin Ion-Exchange Systems
Adsorption Electron transfer Ion-exchange resin Iron Oxidation Smectite
2012/2/9
The pH, Eh, electrical conductivity (EC), and the amounts and valency of replaceable iron were measured periodically on Fe2+- and Fe3+-saturated montmorillonite and cation-exchange resin at three temp...
Transformations of Micas in the Process of Kaolinitization of Granites and Gneisses
Transformations of Micas Kaolinitization Granites Gneisses
2012/2/13
Micas are described from the kaolin type Tertiary weathering crusts formed on granites and gneisses of Lower Silesia, Poland. In the weathering crust, large scale processes of transformation of micas ...
Mossbauer Study of Transformations Induced in Clay by Firing
Mossbauer Study Transformations Clay Firing
2012/2/15
The clay fraction of an Attic soil has been fired at temperatures up to 1100°C and the transformations induced by firing were studied by Mössbauer spectroscopy. The unfired clay contained iron in...