搜索结果: 1-15 共查到“地质学 I.R. Spectra”相关记录29条 . 查询时间(0.174 秒)
Hydroxyl-Stretching Bands in Curve-Fitted Micro-Raman, Photoacoustic and Transmission Infrared Spectra of Dickite from St. Claire, Pennsylvania
Curve-fitting Dickite Infrared LO and TO Crystal Modes Micro-Raman OH bands SEM
2011/12/5
Abstract: The OH-stretching region in curve-fitted micro-Raman, photoacoustic and transmission IR spectra of St. Claire dickite was investigated. Polarized Raman spectra recorded from the (001) and (0...
Structural Fe3+ in Natural Kaolinites: New Insights from Electron Paramagnetic Resonance Spectra Fitting at X and Q-Band Frequencies
Dickite Disorder EPR Fe3+ Kaolinite
2011/12/7
Abstract: Structural Fe3+ in kaolinites and dickites covering a broad range of disorder was investigated using electron paramagnetic resonance (EPR) spectroscopy at both the X and Q-band frequencies. ...
Diffuse Reflectance Spectra of Al Substituted Goethite: A Ligand Field Approach
Band Decomposition Bond Distances Diffuse Reflectance Spectroscopy Goethite Ligand Field Splitting Racah-Parameters
2011/12/6
Abstract: Previous investigations of goethite revealed a substantial variation of color and diffuse reflectance spectra (DRS) in the extended visible range (350–2200 nm). To better understand the caus...
Vibrational spectra of dense, hydrous magnesium silicates at high pressure: Importance of the hydrogen bond angle
high pressure hydrogen bond angle dense hydrous magnesium silicates
2012/3/31
Changes in configuration and hydrogen bonding are inferred from the complex responses of
peak parameters (frequency, width, height, and area) to compression for various hydroxyl groups) depend not on...
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...
Interpretation of XPS Mn(2p) spectra of Mn oxyhydroxides and constraints on the mechanism of MnO2 precipitation
Interpretation XPS Mn(2p) spectra Mn oxyhydroxides MnO2 precipitation
2012/3/31
Calculated Mn(2p3/2) X-ray photoelectron spectra (XPS) of Mn21,Mn31, and Mn41 free ions are strikingly similar to Mn(2p3/2) spectra of Mn21-, Mn31-, and Mn41
-oxides and oxyhydroxides, indicating tha...
Refined Relationships between Chemical Composition of Dioctahedral Fine-Grained Micaceous Minerals and Their Infrared Spectra within the OH Stretching Region. Part II: The Main Factors Affecting OH Vibrations and Quantitative Analysis
Cation Mass Cation Valency IR Spectra OH Stretching Frequencies Quantitative Analysis
2011/12/9
Abstract: A new model for the interpretation of dioctahedral mica infrared (IR) spectra in the OH stretching vibration region is proposed. It is based on the analysis of the main factors responsible f...
Refined Relationships between Chemical Composition of Dioctahedral Fine-Grained Mica Minerals and Their Infrared Spectra within the OH Stretching Region. Part I: Identification of the OH Stretching Bands
Celadonite Glauconite Illite IR Spectra Leucophyllite OH Stretching Frequency
2011/12/9
Abstract: A large and representative collection of clay-size dioctahedral mica minerals differing in their chemical compositions has been studied by infrared (IR) spectroscopy in the OH stretching vib...
Structure and crystal field spectra of Co3Al2(SiO4)3 and (Mg, Ni)3Al2(SiO4)3 garnet
Structure crystal field spectra Co3Al2(SiO4)3 (Mg, Ni)3Al2(SiO4)3 garnet
2012/4/5
Synthetic C03A12(Si04)3garnet and (Mg,Ni)3A12(Si04)3 garnet with Ni/(Ni + Mg)= 0.15-0.18 have been studied by single-crystal X-ray diffraction and optical spectroscopy. The X-ray data confirm that COH...
The Center Shift in Mössbauer Spectra of Maghemite and Aluminum Maghemites
Al-Maghemite Center shift Maghemite Mossbauer effect
2011/12/29
Synthetic, relatively well-crystallized aluminum-substituted maghemite samples, γ-(Aly·Fe1−y)2O3, with y = 0, 0.032, 0.058, 0.084, 0.106 and 0.151 have been studied by X-ray diffraction and zero...
Mossbauer Spectra of Soil Kaolins from South-Western Australia
Iron Kaolin Mossbauer spectroscopy
2011/12/31
Six well-characterized soil kaolins from widely separated sites in south-western Australia and four reference kaolins were studied by 57Fe M鰏sbauer spectroscopy at room temperature after removal of no...
Near-Infrared Reflectance Spectra of Mixtures of Kaolin-Group Minerals: Use in Clay Mineral Studies
Dickite Interstratification Kaolinite Near-infrared spectroscopy Order-disorder X-ray powder diffraction
2012/1/9
Near-infrared (NIR) reflectance spectra for mixtures of ordered kaolinite and ordered dickite have been found to simulate the spectral response of disordered kaolinite. The amount of octahedral vacanc...
Interpretation of Mossbauer Spectra of Nontronite, Celadonite, and Glauconite
Atomic coordinates Celadonite Electric field gradient Glauconite Mossbauer spectroscopy Nontronite
2012/1/11
A new approach to the interpretation of Mössbauer spectra of Fe3+-phyllosilicates having vacant trans-octahedra is based on (1) crystal structure simulation methods that allow for the size and th...
Effect of Adsorbed Iron on Thermoluminescence and Electron Spin Resonance Spectra of Ca-Fe-Exchanged Montmorillonite
Electron spin resonance Iron Montmorillonite Surface adsorption Thermoluminescence
2012/1/13
The electron spin resonance (ESR) spectra and the natural and gamma-induced thermoluminescence (TL) glow curves of a series of variably cation-exchanged Fe-Ca-clays prepared from SWy-1 montmorillonite...
Iron Sites in Nontronite and the Effect of Interlayer Cations From Mossbauer Spectra
Interlayer cation Iron Mossbauer spectroscopy Nontronite Octahedral site
2011/11/25
Abstract: The 57Fe Mössbauer spectra of untreated, Ca- and K-saturated nontronite from Garfield, Washington, were measured. The spectrum of the untreated sample was computer-fitted to 8 peaks def...