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An in situ Raman spectroscopic study of Na2Si2O5 at high pressures and temperatures: Structures of compressed liquids and glasses
situ Raman spectroscopic study Na2Si2O5 high pressures temperatures Structures glasses
2012/4/5
Raman spectra ofNa2Si20sglassand Na2Si20sliquid have been collected in situ to pressuresof16GPaat300Kand 10GPaat885K.Inglasscompressed at300K,bands
associated withintertetrahedral bridging 0 atoms de...
Mossbauer Spectroscopic Evidence for Citrate-Bicarbonate-Dithionite Extraction of Maghemite from Soils
Mossbauer spectroscopy Soil genesis
2011/12/1
Abstract: In a previous paper, we used powder X-ray diffraction and changes in magnetic susceptibility to argue the importance of pedogenic maghemite to soils and the efficacy of the chemical extracta...
Spectroscopic Approach for Investigating the Status and Mobility of Ti in Kaolinitic Materials
Diffuse reflectance spectroscopy Kaolins Ti-mobility Ti-status
2011/12/28
The form under which Ti occurs in kaolinitic materials from various environments has been investigated using second derivative diffuse reflectance spectroscopy. The position of the absorption edge may...
Infrared Spectroscopic Analyses on the Nature of Water in Montmorillonite
Montmorillonite Spectroscopy Water
2011/12/29
Interlayer cations and moisture content greatly influence the molecular vibrations of H2O in montmorillonite as shown through reflectance spectroscopy in the infrared. The absorptions due to H2O have ...
The Transformation of Lepidocrocite During Heating: A Magnetic and Spectroscopic Study
Dehydroxilation IR spectra Lepidocrocite Maghemite Phase transformation
2011/12/29
Infrared (IR) spectroscopy, in combination with magnetic methods, was used to study the thermally induced transformation of synthetic lepidocrocite (γ-FeOOH) to maghemite (γ-Fe2O3). Magnetic analyses ...
Rietveld Refinement and Fourier-Transform Infrared Spectroscopic Study of the Dickite Structure at Low Temperature
Dickite FTIR Infrared spectroscopy Low temperature Neutron powder diffraction Rietveld refinement
2011/12/29
The full structure of dickite from St. Claire, Pennsylvania, including hydrogen atoms, was refined in space group Cc using time-of-flight neutron powder diffraction data obtained at 12 K and Rietveld ...
Adsorption and Spectroscopic Studies on the Interactions of Cobalt(III) Chelates with Clays
Clay-metal chelate interactions
2011/12/1
Abstract: The interactions of the following three kinds of racemic and enantiomeric cobalt(III) chelates with montmorillonite and saponite are studied: [Co(en)3]3+ (en = ethylenediamine), [Co(diNOsar)...
X-ray Photoelectron Spectroscopic Study of Cobalt(II) and Nickel(II) Sorbed on Hectorite and Montmorillonite
Cation exchange Cobalt Hectorite Ligand exchange Montmorillonite Nickel X-ray photoelectron spectroscopy
2011/11/30
Abstract: The safe disposal of 60Co, 63Ni, and 59Ni has required considerable information on the interactions of Co2+ and Ni2+ with clay minerals in the geosphere. X-ray photoelectron spectroscopy (XP...
57Fe Mossbauer Spectroscopic Study of Structural Changes During Dehydration of Nontronite: Effect of Different Exchangeable Cations
Mossbauer Dehydration Nontronite Cation migration Tetrahedral site
2012/1/4
Dehydration-induced migration of different exchangeable cations toward the layers of nontronite has been studied by M鰏sbauer spectroscopy. As interlayer water is removed exchangeable cations migrate t...
Mossbauer Spectroscopic Identification of Iron Oxides in Nontronite from Hohen Hagen, Federal Republic of Germany
Goethite Iron Maghemite Magnetic properties Mossbauer spectroscopy Nontronite
2012/1/9
Iron impurities in the Hohen Hagen nontronite (NG-1) were identified as maghemite and goethite. The phase identified as maghemite was magnetically ordered at both room temperature and 87 K, with hyper...
X-ray Photoelectron Spectroscopic Study of the Effect of Heating on Montmorillonite Containing Sodium and Potassium Cations
Montmorillonite Noncrystalline Surface composition Thermal treatment X-ray photo-electron spectroscopy X-ray powder diffraction
2012/1/13
The effect of heating on montmorillonites containing exchangeable Na and K has been studied by X-ray photoelectron spectroscopy (XPS). The surface composition of the unheated montmorillonite was consi...
Infrared Spectroscopic Study of the Formamide-Na-Montmorillonite Complex. Conversion of s-Triazine to Formamide
Formamide Herbicide Hydrolysis Infrared spectroscopy Intercalation Montmorillonite s-Triazine
2012/1/12
The adsorption and degradation on montmorillonite of s-triazine, the parent compound of a major group of triazine-based herbicides, were studied by Fourier-transform infrared spectroscopy. The origina...
Magnetic Ordering at 4.2 and 1.3 K in Nontronites of Different Iron Contents: A 57Fe M鰏sbauer Spectroscopic Study
Interlayer site Iron Magnetic ordering Mossbauer spectroscopy Nontronite Octahedral site Tetrahedral site
2012/1/11
The 57Fe M鰏sbauer spectra of six nontronite samples were measured at appropriate temperatures of 4.2 and 1.3 K. Three of the nontronites gave a complex magnetic hyperfine spectrum showing magnetic ord...
Mossbauer Spectroscopic Study of the Iron Mineralogy of Post-Glacial Marine Clays
Hematite Iron Magnetite Mossbauer spectroscopy Quick clay Smectite Yield strength
2012/1/12
Three post-glacial marine clays from eastern Canada and one marine clay from Japan have been studied by M鰏sbauer spectroscopy to ascertain their iron mineralogy. Small amounts of hematite (in two samp...
Raman Spectroscopic Study of Kaolinite in Aqueous Suspension
Aqueous suspension Infrared spectroscopy Kaolinite pH Raman spectroscopy
2012/2/2
The vibrational modes of clay minerals in aqueous suspension are uniquely accessible to Raman spectroscopy, but this potentially powerful approach has not been applied heretofore to study clays in aqu...