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The Influence of Aluminum on the Formation of Iron Oxides. IV. The Influence of [Al], [OH], and Temperature
Aluminum Ferrihydrite Goethite Hematite Iron oxides
2012/2/9
Ferrihydrite was transformed to goethite and/or hematite at various temperatures, [OH], and [Al]. Increasing temperature and [Al] favored hematite, increasing [OH] favored goethite. A given [Al] induc...
Origin of Iron-Rich Montmorillonite from the Manganese Nodule Belt of the North Equatorial Pacific
Authigenic Formation Deep-Sea Clay Manganese Nodule Belt Montmorillonite Pacific Sediments Smectite
2012/2/9
Clay minerals in the upper 50 cm of sediment that surround the Cu- and Ni-rich manganese nodules in the North Equatorial Pacific form two fractions: terrigenous (mostly eolian) illite, chlorite, and k...
The Influence of Aluminum on Iron Oxides. Part II. Preparation and Properties of Al-Substituted Hematites
Aluminum Ferrihydrite Goethite Hematite Iron
2012/2/9
Aluminum-substituted hematites (Fe2−xAlxO3) were synthesized from Fe-Al coprecipitates at pH 5.5, 7.0, and in 10−1, 10−2, and 10−2 M KOH at 70°C. As little as 1 mole % Al suppr...
The Influence of Aluminum on Iron Oxides. Part I. The Influence of Al on Fe Oxide Formation from the Fe(II) System
Aluminum Ferrihydrite Goethite Iron Lepidocrocite Maghemite
2012/2/10
The influence of Al on the products formed by aerial oxidation at pH 5.5–7 and 20°C of Fe(II) chloride, sulfate and carbonate solutions, was examined. In all cases Al at levels Al/Al + Fe = 0.09–0.30 ...
Synthesis of Iron Layer Silicate Minerals under Natural Conditions
Chamosite Greenalite Iron Lembergite Nontronite Synthesis
2011/11/18
Abstract: The low temperature synthesis of iron silicate minerals with clay structures is possible at surface temperatures only under reducing conditions. Under oxidizing conditions clay minerals coul...
Electron Spin Resonance Studies of Iron Oxides Associated with the Surface of Kaolins
Goethite Hematite Iron Kaolin Lepidocrocite
2012/2/10
The different types of iron oxide phases associated with the surfaces of two suites of kaolins from Georgia, U.S.A., and from the Southwest Peninsula of England, have been identified using electron sp...
Amorphous and Crystalline Titanium and Iron-Titanium Oxides in Synthetic Preparations, at near Ambient Conditions, and in Soil Clays
Anatase Goethite Hematite Iron Pseudorutile Synthesis Titanium
2012/2/10
A series of mixed iron and titanium oxide coprecipitates ranging in composition between 0 < Ti/Ti + Fe < 1 was synthesized and aged under varying conditions of pH, temperature and time in order to est...
Reduction and Oxidation of Fe3+ in Dioctahedral Smectites桰II.* Oxidation of Octahedral Iron in Montmorillonite
Exchange Iron Oxidation Reduction
2012/2/10
Structural Fe2+ in montmorillonite is readily oxidized by contact with water, salt solutions or on mild heating. This is shown clearly by the M鰏sbauer spectra and is associated with a sharpening of th...
Crystal Nucleation and Growth in Hydrolysing Iron(III) Chloride Solutions
Crystal Nucleation Hydrolysing Iron Chloride Solutions
2011/11/18
Abstract: 0.5 molal iron(III) chloride solutions were hydrolysed at room temperature by base additions in the range OH/Fe mole ratio 0–2.75. After an ageing period the hydrolysed solutions were used t...
Analysis of Iron-Bearing Clay Minerals by Electron Spectroscopy for Chemical Analysis (ESCA)
Clay Minerals Electron Spectroscopy Chemical Analysis (ESCA)
2012/2/13
Nontronite and biotite were analyzed by Electron Spectroscopy for Chemical Analysis (ESCA). Both minerals yielded ESCA spectra with well-defined peaks and the elements identified by the ESCA spectra w...
The Formation of Hematite from Amorphous Iron(III)Hydroxide
Formation of Hematite Amorphous Iron(III)Hydroxide
2011/11/18
Abstract: The formation of hematite from amorphous Fe(III)hydroxide in aqueous systems at pH 6 and 70°C, both with and without oxalate, was followed by kinetic measurements, electron microscopy, i.r. ...
Stability of Mixed Iron and Aluminum Hydrous Oxides on Montmorillonite
Mixed Iron Aluminum Hydrous Oxides Montmorillonite
2011/11/18
Abstract: Montmorillonite clay samples were coated with 16 m-equiv/g of clay or iron plus aluminum as hydrous oxides and aged 1 yr, in suspensions of pH 6 or 8. The magnesium exchange capacity (MgEC) ...
Electron-microscopic and Mossbauer Spectroscopic Studies of Iron-Stained Kaolinite Minerals
Electron-microscopic Mossbauer Spectroscopic Iron-Stained Kaolinite Minerals
2012/2/15
An electron-microscopic and M鰏sbauer spectroscopic study of a range of kaolinites has revealed three distinct types of iron contamination within these minerals: a) Ferric ion may substitute for alumin...
Hisingerite Occurring as a Weathering Product of Iron-Rich Saponite
Hisingerite Occurring Iron-Rich Saponite
2012/2/14
Hisingerite occurs as a weathering product of iron-rich saponite in rhyolitic tuff of Oya, Tochigi Prefecture. The chemical composition: SiO2, 40·68%; Al2O3, 4·44%; Fe2O3, 28·54%; MgO, 1·85%; CaO, 1·4...
Isomorphous Substitution of Iron for Aluminium in some Soil Kaolinites
Isomorphous Substitution Iron Aluminium Soil Kaolinites
2012/2/14
Clay (<2 祄) and fine silt (2?0 祄) fractions of twenty seven soil samples from eight tropical ferruginous profiles of the Mysore Plateau (India) were analysed for kaolinite by dehydroxylation and selec...