搜索结果: 1-15 共查到“理学 Mossbauer spectroscopy”相关记录17条 . 查询时间(0.497 秒)
Iron-Oxide Mineralogy of a Mollisol from Argentina: A Study by Selective-Dissolution Techniques, X-Ray Diffraction, and Mossbauer Spectroscopy
Ammonium-Oxalate Dissolution Treatment Chemical Analysis Dithionite-Citrate-Bicarbonate Dissolution Treatment Dithionite-Ethylenediaminetetraacetic Acid Dissolution Treatment
2011/12/6
Abstract: Selective-dissolution techniques by ammonium oxalate (OX), dithionite-citrate-bicarbonate (DCB), and dithionite-ethylenediaminetetraacetic acid (D-EDTA), and X-ray diffraction and M鰏sbauer s...
Crystal Structure Refinement and Mossbauer Spectroscopy of an Ordered, Triclinic Clinochlore
Cation Ordering Chlorite Clinochlore Crystal Structure Mossbauer
2011/12/22
Abstract: The crystal structure of a natural, ordered IIb-4 triclinic clinochlore has been refined in space group C1¯ from 4282 unique X-ray intensity measurements of which 3833 are greater than ...
Variable-Temperature Mossbauer Spectroscopy of Nano-Sized Maghemite and Al-Substituted Maghemites
Al substitution Maghemite Mossbauer effect
2011/12/28
Synthetic aluminum-substituted maghemite samples, γ-(Fe1-xAlx)2O3, have been prepared by thermal decomposition of Al-lepidocrocite (γ-Fe1-xAlxOOH), with x = 0, 0.04, 0.06, 0.14 and 0.18. The particles...
Studies of the Reactivity of the Ferrihydrite Surface by Iron Isotopic Exchange and Mossbauer Spectroscopy
Adsorption Arsenate Dissolution kinetics Ferrihydrite Iron octahedra Mossbauer spectroscopy Reactive sites Solubility Surface chemistry
2011/12/1
Abstract: Two-line ferrihydrite is an important adsorbent of many toxics in natural and anthropogenic systems; however, the specific structural sites responsible for the high adsorption capacity are n...
Comparison of Pedogenic and Sedimentary Greigite by X-ray Diffraction and Mossbauer Spectroscopy
Greigite Mossbauer Sediment Soil XRD
2011/12/29
Greigites from a gley and a Tertiary sediment were investigated by X-ray diffraction and Mössbauer spectroscopy. The cell-edge length a of 9.8639 Å ± 0.0003 Å for the soil greigite wa...
Computer Simulation of Cation Distribution in Dioctahedral 2:1 Layer Silicates Using IR-Data: Application to Mossbauer Spectroscopy of a Glauconite Sample
Cation distribution Computer simulation Glauconite Mossbauer spectra
2011/12/31
A new approach is described to computer simulate cation distribution in octahedral sheets of dioctahedral 2:1 layer silicates with vacant trans-octahedra. This approach makes use of the information on...
Synthesis of 1:1 and 2:1 Iron Phyllosilicates and Characterization of their Iron State by Mossbauer Spectroscopy
Iron Mossbauer spectroscopy Phyllosilicate Synthesis
2012/1/4
Iron phyllosilicates with 1:1 and 2:1 layer structures were prepared from silicic acid, ferrous sulfate and sodium hydroxide. Hydrothermal treatment at 100?00癈 of a reaction mixture with an initial Fe...
Structural Study of a Benzidine-Vermiculite Intercalate Having a High Tetrahedral-Iron Content by 57Fe Mossbauer Spectroscopy
Benzidinium ion Intercalate Iron Mossbauer spectra Vermiculite
2012/1/10
57Fe Mössbauer spectra obtained at room temperature and 78 K for natural Mg-saturated, Ca-saturated, and benzidinium-intercalated vermiculite having a high tetrahedral iron content are presented....
Iron Substitution in Montmorillonite, Illite, and Glauconite by 57Fe Mossbauer Spectroscopy
Glauconite Illite Iron Montmorillonite Mossbauer spectra
2012/1/10
The 57Fe M鰏sbauer spectra of an iron-rich montmorillonite, an illite, and two glauconites were measured and computer-fitted with appropriate Fe3+ and Fe2+ doublet resonances. The broad experimental Fe...
57Fe Mossbauer Spectroscopy of Montmorillonites: A New Interpretation
Iron Montmorillonite Mossbauer spectroscopy Octahedral sites Tetrahedral sites
2012/1/12
The 57Fe M鰏sbauer spectra of several montmorillonites, measured at room temperature and 453 K, showed a considerably broadened Fe3+ resonance which can be computer-fitted with a similarly broadened Fe...
Characterization of Goethite and Hematite in a Tunisian Soil Profile by Mossbauer Spectroscopy
Aluminum Goethite Hematite Iron Manganese Mossbauer spectroscopy Soil
2012/1/12
As part of the characterization of a Tunisian red soil profile, six samples, taken at different depths, were investigated by M鰏sbauer spectroscopy at room temperature and at 80 K to obtain information...
Quantitative Determination of Aluminum-Substituted Goethite-Hematite Mixtures by Mossbauer Spectroscopy
Aluminum Goethite Hematite Mossbauer spectroscopy Quantitative mineralogy
2012/1/12
Mixtures of synthetic Al-substituted goethite (α-Fe0.814Al0.186OOH) and hematite (α-Fe1.658Al0.342O3) (75, 50, 25, 3% hematite by weight) were studied by Mössbauer spectroscopy to evaluate the us...
Structural Studies of Nontronites with Different Iron Contents by 57Fe Mossbauer Spectroscopy
Interlayer cation Iron Mossbauer spectroscopy Nontronite Structural sites
2012/2/1
The 57Fe M鰏sbauer spectra of a series of untreated and Ca-saturated nontronites showed a predominant Fe3+ resonance which was computer-fitted with two Fe3+ doublets defining iron in non-equivalent cis...
Characterization of Adsorbed Iron in Montmorillonite by Mossbauer Spectroscopy
Debye temperature Iron Montmorillonite Mossbauer spectroscopy Water
2011/11/23
Abstract: The Mössbauer effect of Fe57 was used to probe and characterize iron ions adsorbed on the interlayer surfaces of montmorillonite. Measurements were performed with Fe- and Ca-saturated m...
Application of Electron Paramagnetic Resonance and Mossbauer Spectroscopy in the Investigation of Kaolinite-Group Minerals
Dickite Electron paramagnetic resonance Halloysite Iron Kaolinite Mossbauer spectroscopy Nacrite
2011/11/22
Abstract: Samples of nacrite, dickite, kaolinite, and halloysite were investigated using X-band electron paramagnetic resonance (EPR) and Mössbauer spectroscopy. Fe3+ gave rise to EPR signals at ...