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Amorphous Aluminum Hydroxide Formed at the Earliest Weathering Stages of K-Feldspar
Aluminum hydroxide Gibbsite Halloysite K-feldspar Weathering product
2011/12/27
Weathering products formed on the surface of K-feldspar in Yakushima Island, Japan were investigated by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron micros...
Selective Gas Adsorption by Amorphous Clay-Mineral Derivatives
Amorphous Derivative Gas Adsorption Gas Separation Halloysite Kaolinite Montmorillonite Potassium Fluoride CMS Source Clay SAz-1 Specific Surface
2011/12/7
Abstract: Amorphous derivates prepared by aqueous reaction of various aluminosilicate clay minerals with concentrated KF solution at 80–110°C were studied for their gas adsorption properties. The four...
Electron irradiation-induced phase segregation in crystalline and amorphous apatite: A TEM study
Electron irradiation-induced phase segregation crystalline amorphous apatite A TEM study
2012/4/6
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ofbeamenergiesandbeamcurrents.Irradiationofcrysta...
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...
Surface Charge Characteristics of Amorphous Aluminosilicates
Surface Charge Characteristics Amorphous Aluminosilicates hydrous alumina
2012/2/13
The surface charge characteristics of a range of synthetic amorphous aluminosilicates, hydrous alumina, hydrous silica and two allophanic soil clays were determined by the retention of Na+ and Cl as c...
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. ...
The Interaction of Water with Goethite (α-FeOOH) and Amorphous Hydrated Ferric Oxide Surfaces
Goethite (α-FeOOH) Amorphous Hydrated Ferric Oxide Surfaces
2011/11/18
Abstract: The interaction of water with synthetically prepared goethite (α-FeOOH) and amorphous hydrated ferric oxide surfaces was studied using i.r. absorption and water vapor adsorption measurements...
Trace Element Concentration in Amorphous Clays of Volcanic Ash Soils in Oregon
Trace Element Concentration Amorphous Clays Volcanic Ash Soils
2012/2/20
Clay fractions in soils from a transect of the Mazama ash deposit (6600-yr-old) contained more than 80% amorphous material. Instrumental neutron activation analysis was used to compare the trace eleme...
Effects of Amorphous Constituents on Some Mineralogical and Chemical Properties of a Panamanian Latosol
Amorphous Constituents Mineralogical Chemical Properties Panamanian Latosol
2012/2/20
X-ray diffraction studies revealed sesquioxide coatings existed on the surfaces of the clay minerals. Mineralogically, the soil was composed of kaolin, amorphous minerals, hydrated iron and aluminum o...
Structural Organization in Amorphous Silico-Aluminas
Structural Organization Amorphous Silico-Aluminas
2012/2/21
A structure model for amorphous hydrated or dehydrated silico-aluminas with composition varying between 0 < Al: Al+Si < 1 is presented. A central core made from a tetrahedral network in which silicon ...