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A Synthetic Na-Rich Mica: Synthesis and Characterization by 27Al and 29Si Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
KGa-1 MAS NMR Spectroscopy Metakaolinite Mica Na Mica Synthetic Clay Mineral
2011/12/7
Abstract: A swelling mica, Na2Mg3(Al2Si2)O10F2·xH2O, (hereafter “Na-4 mica”) was synthesized from metakaolinite + MgO and Mg aluminosilicate gels at different temperatures and durations using NaF flux...
Effects of Secondary Iron Phases on Kaolinite 27Al MAS NMR Spectra
27Al NMR Spectroscopy Goethite Halloysite Hematite Iron Kaolinite Magnetic Susceptibility
2011/12/8
Abstract: Eight kaolinite and 2 halloysite samples were analyzed using 27Al magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy, chemical analysis and magnetic susceptibility to und...
Cation mixing in natural MgAl2O4 spinel: A high-temperature 27Al NMR study
Cation mixing MgAl2O4 spinel high-temperature 27Al NMR study
2012/4/6
ThepositionaldisorderofMg andAl cationsbetweenthetetrahedralandoctahedralsitesinnaturalMgAlO spinelhasbeeninvestigatedby AlMASNMRatroomtem-2 427peratureandin-situhigh-temperatureAlNMRspectroscopyupto1...
Fe ordering in kaolinite: Insights from 29Si and 27Al MAS NMR spectroscopy
Fe ordering kaolinite Insights 29Si 27Al MAS NMR spectroscopy
2012/4/5
Kaolinite-richsamples wereselectedfor 27 Aland 29SiMASNMRstudy to explore the effectofFeontheir spectraandprovide insight into the nature ofFeorderingin kaolinite. Initial characterization bychemicala...
27Al MAS NMR and Aluminum X-ray Absorption Near Edge Structure Study of Imogolite and Allophanes
Allophane Aluminum Imogolite NMR XANES
2011/12/29
This paper compares the results of 27Al nuclear magnetic resonance spectroscopy (NMR) and Al-K-edge X-ray Absorption Near Edge Structure (XANES) of natural imogolite and allophanes and some crystallin...
A Chemical, XRD, and 27Al MAS NMR Investigation of Miocene Gulf Coast Shales with Application to Understanding Illite/Smectite Crystal-Chemistry
Burial diagenesis Gulf Coast Illite/smectite Miocene NMR
2011/12/30
This study assesses the distribution of Al and Fe in mixed-layer illite/smectites (I/S) in shales undergoing burial diagenetic changes, using evidence from 27Al NMR, XRD, and chemical analyses. Sample...
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 ...
Mechanisms of Palygorskite and Sepiolite Alteration as Deduced from Solid-State 27Al and 29Si Nuclear Magnetic Resonance Spectroscopy
Al coordination Hydrothermal transformation Nuclear magnetic resonance Palygorskite Sepiolite Smectite X-ray powder diffraction
2012/1/6
The mechanisms of palygorskite and sepiolite alteration to smectite under mild hydrothermal conditions were investigated by solid-state 27Al and 29Si magic-angle spinning-nuclear magnetic resonance (M...
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 ...