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Influence of Climate on the Iron Oxide Mineralogy of Terra Rossa
Goethite Hematite Pedoclimate Terra rossa XRD
2011/11/30
Abstract: Terra rossa samples were taken from the B horizons of soil profiles and from cracks within limestone in Italy. The average annual temperature (AAT) of the sites ranged from 8.4 to 20.3°C and...
Influence of Fe(II) on the Formation of the Spinel Iron Oxide in Alkaline Medium
Dissolution Ferrihydrite Maghemite Magnetite Mossbauer spectroscopy
2011/12/31
Fe(II) and Fe(III) in various proportions were coprecipitated by NH3 at pH ≈ 11. The Fe(II)/Fe(III) ratio (x) was varied from 0.10 to 0.50. After stabilization by aging at pH ≃ 8 in anaerobic co...
The Influence of Aluminum on Iron Oxides. Part XVI: Hydroxyl and Aluminum Substitution in Synthetic Hematites
Al substitution Cell-edge lengths Hematite LOI OH substitution X-ray intensity
2011/12/31
Synthetic hematites with Al substitutions between 0 and 18 mol % were synthesized at different temperatures and water activities. The cell-edge lengths a for different synthesis conditions decreased l...
Influence of Citrate on the Kinetics of Fe(II) Oxidation and the Formation of Iron Oxyhydroxides
Citrate Goethite Hydrolysis Iron oxyhydroxide Lepidocrocite Oxidation
2011/11/30
Abstract: The rate of Fe(II) oxidation at a constant rate of oxygen supply in the presence of citrate was measured at pH 6.0 at various citrate/Fe(II) molar ratios at 23.5°C in 0.01 M ferrous perchlor...
Influence of Calcium and Sodium Concentration on the Microstructure of Bentonite and Kaolin
Aggregation Bentonite Electrolyte Flocculation Kaolin Scanning electron microscopy
2012/1/5
The influence of added sodium and calcium nitrate electrolyte on the particle aggregates in the colloid fraction of natural bentonite and kaolin was studied. Clays were flocculated in distilled water ...
Influence of Dodecylamine Chloride on the Surface Free Energy of Kaolinite
Contact angle Dodecylamine chloride Hydrophobicity Kaolinite Surface free energy
2011/11/30
Abstract: Contact angles of glycerol and diiodomethane drops were measured on the surface of kaolin pellets covered with different amounts of dodecylamine chloride (DDACl) to as much as one monolayer....
The Influence of Aluminum on Iron Oxides. XV. Al-for-Fe Substitution in Synthetic Lepidocrocite
Aluminum Infrared spectroscopy Iron Lepidocrocite X-ray powder diffraction
2012/1/4
Lepidocrocite samples, γ-FeOOH, containing 0–10 mole % Al-for-Fe substitution were synthesized at 15°C and pH 8 by oxidizing mixed FeCl2-AlCl3 solutions. The unit-cell parameters a, b, and c were meas...
The Influence of Aluminum on Iron Oxides: XIV. Al-Substituted Magnetite Synthesized at Ambient Temperatures
Aluminum Goethite Iron oxide Magnetite Mossbauer spectroscopy X-ray powder diffraction
2012/1/4
Mixtures of magnetite and goethite were formed by the slow oxidation of mixed FeCl2-AlCl3 solutions in an alkaline environment at room temperature. The compositions of the products ranged from almost ...
Influence of Clay on Water Movement in Coarse-Textured Soils
Clay fraction Hydraulic conductivity Particle size Soil Water movement
2012/1/4
Effects of clay content on saturated hydraulic conductivities (k) of two coarse textured soils, Vista (mixed thermic Typic Xerochrepts) and Hanford (mixed nonacid Typic Xerorthents), and a medium text...
Influence of Hydrazine on the Vibrational Modes of Kaolinite
Fourier-transform infrared spectroscopy Hydrazine Kaolinite OH-vibration modes Raman spectroscopy X-ray powder diffraction
2012/1/4
Raman and Fourier-transform-infrared (FTIR) spectroscopic methods and X-ray powder diffraction (XRD) techniques have been used to study the influence of hydrazine on the vibrational modes of kaolinite...
Influence of Mn2+ and pH on the Formation of Iron Oxides from Ferrous Chloride and Ferrous Sulfate Solutions
Goethite Infrared spectroscopy Iron oxides Lepidocrocite Maghemite Manganese Synthesis X-ray powder diffraction
2012/1/6
The influence of Mn2+ on the formation of Fe oxides at pHs of 6.0 and 8.0 and varying Mn/Fe molar ratios (0, 0.1, 1.0, and 10.0) in the FeCl2-NH4OH and FeSO4-NH4OH systems was studied by X-ray powder ...
Influence of Structural and Adsorbed Si on the Transformation of Synthetic Ferrihydrite
Adsorption Crystal structure Ferrihydrite Infrared spectroscopy Silicon Synthesis X-ray powder diffraction
2012/1/5
The transformation of ferrihydrite to goethite and/or hematite, as influenced by the presence of co-precipitated Si, was investigated by infrared spectroscopy (IR), X-ray powder diffraction (XRD), and...
Influence of Exchangeable Cations on the Surface Free Energy of Kaolinite as Determined from Contact Angles
Contact angle Dispersion Kaolinite Surface free energy Wettability
2012/1/5
The influence of adsorbed H+, Na+, K+, Ca2+, Mg2+, Ba2+, and Al3+ ions on the wettability of a kaolinite surface was determined from contact angles, which were measured in kaolinite-water drop- air (s...
Influence of Manganese Oxide Minerals on the Formation of Iron Oxides
Akaganeite Cryptomelane Feroxyhyte Hausmannite Iron oxides Manganese Oxidation-reduction Pyrolusite Synthesis
2012/1/10
The influence of manganese oxide minerals (cryptomelane, hausmannite, and pyrolusite) on the formation of iron oxides was studied in the FeCl2-NH4OH system at different Mn/Fe molar ratios (0, 0.01, 0....
Influence of Silicon and Phosphorus on Structural and Magnetic Properties of Synthetic Goethite and Related Oxides
Electron diffraction Ferrihydrite Goethite Mossbauer spectroscopy Phosphorus Silicon X-ray powder diffraction
2012/1/9
A series of synthetic goethites containing varying amounts of Si and P dopants were characterized by X-ray powder diffraction, electron diffraction, microbeam electron diffraction, and M鰏sbauer spectr...