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Effect of Phosphate on the Crystallization of Hematite, Goethite, and Lepidocrocite from Ferrihydrite
Crystallization Ferrihydrite Goethite Hematite Lepidocrocite Phosphate
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2011/12/7
Abstract: We investigated the crystallization of ferrihydrite prepared by hydrolysis of Fe(NO3)3 solutions containing phosphate. Crystallization was studied at different pH (3–9), temperatures (298, 3...
Hydrothermal Crystallization of Ammonium-Saponite at 200C and Autogenous Water Pressure
Cation Exchange Capacity Saponite Synthesis X-ray Diffraction X-ray Fluorescence
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2011/12/1
Abstract: The effects of reaction time (2 to 72 h) and NH4+/Al3+ molar ratio (1.6, 2.4 and 3.2) on the hydrothermal synthesis of ammonium-saponites are investigated. The gels are obtained by mixing po...
Sinoite (Si2N2O): Crystallization from EL chondrite impact melts
Sinoite Si2N2O Crystallization EL impact melts
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2012/4/6
Sinoite(Si N O)waspreviouslyobservedonlyinEL6chondritesandrecentlymodeled
ashavingformedovergeologictimescalesatmetamorphictemperaturesof950C.I
foundseveral10¤C21m-sizedsubhedralandeuhedralgrainsoft...
Effect of Time and Temperature on the Chemical Composition and Crystallization of Mixed Iron and Aluminum Species
Aluminum Crystallization Gibbsite Iron
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2011/12/1
Abstract: We studied the influence of time ageing (up to 120 d at 50°C or 30d at 95°C) on the mineralogical and chemical composition of hydrolytic species of mixed aluminum and iron samples formed at ...
The Use of Color to Quantify the Effects of pH and Temperature on the Crystallization Kinetics of Goethite Under Highly Alkaline Conditions
Color Colorimetry Crystallization Goethite Hematite Kinetics L*a*b* color space
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2011/12/28
The crystallization kinetics of goethite were studied colorimetrically under highly alkaline conditions (pH 10.1–12.2) at temperatures from 40° to 85°C. Color changes during crystallization from fresh...
Smectite-Illite Transition in Barbados Accretionary Wedge Sediments: TEM and AEM Evidence for Dissolution/Crystallization at Low Temperature
Accretionary wedge AEM analyses Barbados Electron diffraction Fluid-sediment interaction Illite Mixed-layer Smectite TEM images
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2011/12/1
Abstract: Sediments from depths to 670 m in the Barbados accretionary complex and transecting the décollement zone have been studied by transmission and analytical electron microscopy (TEM/AEM). The s...
Effects of Humic Acid on the Crystallization of Aluminum Hydroxides
Aluminum hydroxide Bayerite Boehmite Crystallization Gibbsite Humic acid X-ray powder diffraction
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2011/11/30
Abstract: The effects of humic acid (HA) on the crystallization of precipitation products of Al under mildly acidic to alkaline conditions were investigated. The extent of Al precipitation substantial...
Effect of Cysteine and Manganese on the Crystallization of Noncrystalline Iron(III) Hydroxide at pH 8
Crystallization Cysteine Ferrihydrite Goethite Iron oxides Manganese
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2011/11/30
Abstract: To provide a greater understanding of the crystallization of iron oxides under natural aqueous conditions, the combined effect of an inorganic ion (Mn2+) and a reducing organic ligand (L-cys...
A First-Order Markov-Chain Model of Zeolite Crystallization
Crystallization Markov-chain model Rate constants Silica oligomers Zeolites
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2012/1/6
A method using a finite, first-order Markov chain is presented to estimate rate constants for zeolite formation from experimental nuclear magnetic resonance (NMR) data on the abundance of different si...
Mechanisms of Gibbsite Crystallization from Partially Neutralized Aluminum Chloride Solutions
Aluminum hydroxide Crystallization Gibbsite OH-Al polymer Nucleation
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2011/11/28
Abstract: To interpret the erratic conditions, rates, and extent of gibbsite crystallization from partially neutralized AlCl3 solution, the following hypothesis is proposed: The initial OH-Al polymers...
Crystallization of Iron Oxides on Calcite Surfaces in Static Systems
Calcite Crystallization Goethite Iron oxide Lepidocrocite Synthesis
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2012/1/13
Iron salts react readily with calcite in oxidizing calcareous environments to produce solid phase Fe-oxides. These reactions represent important processes in aqueous, geologic, and pedogenic environme...
Influence of Relative Humidity on the Crystallization of Fe(III) Oxides From Ferrihydrite
Ferrihydrite Goethite Hematite Iron oxides Relative humidity Synthesis
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2012/2/7
Ferrihydrite prepared in different manners was kept under relative humidities ranging from 75 to 100% and at temperatures of 45° and 55°C for 180 days. Ferrihydrite transformed to hematite and goethit...
Influence of Organic Anions on the Crystallization of Ferrihydrite
Crystallization Ferrihydrite Goethite Hematite Hydroxy-carboxylic acid
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2012/2/10
Hydroxy-carboxylic acids inhibit the crystallization of ferrihydrite in the pH range 9–11 in the order citric > meso tartaric > L-tartaric ≫ lactic and favor hematite formation relative to goeth...
Kaolinite Synthesis. I. Crystallization Conditions at Low Temperatures and Calculation of Thermodynamic Equilibria. Application to Laboratory and Field Observations
Aluminum Hydroxide Kaolinite Synthesis Thermodynamic
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2012/2/10
The equilibrium diagrams developed for Al-hydroxide and for kaolinite by Garrels and Christ (1965) have been modified by taking into account the existence of gels. From the stability zones obtained, t...
Kaolinite Crystallization at Room Temperature by Homogeneous Precipitation—III: Hydrolysis of Feldspars
Kaolinite Crystallization Homogeneous Precipitation Hydrolysis of Feldspars
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2011/11/18
Abstract: The kaolinite crystallization by homogeneous precipitation with previous hydrolysis of the feldspars added has been followed by pH and potassium concentration measurements. The synthesized p...