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Synthetic Allophane and Layer-Silicate Formation in SiO2-Al2O3-FeO-Fe2O3-MgO-H2O Systems at 23°C and 89°C in a Calcareous Environment
Allophane Hisingerite Hydrous feldspathoid Nontronite Poorly-ordered layer silicates “Protoimogolite” Saponite Synthesis
2012/1/4
Solutions containing AlCl3 and Si(OH)4 (concentrations ≤ 1.5 mM with molar Si:Al ratios of 1:2, 1:1 and 3:1) and FeCl2 (0, 0.5 and 1.0 mM) were adjusted to pH 8 with Ca(OH)2, and incubated at 23°C and...
Effect of SiO2/Al2O3 Ratio on the Thermal Reactions of Allophane. II. Infrared and X-Ray Powder Diffraction Data
Allophane Imogolite Infrared spectroscopy Silica/alumina ratio Thermal stability X-ray powder diffraction
2012/2/8
Allophanes with SiO2/Al2O3 molar ratios from 1.38 to 1.92 were heated at temperatures up to 500°C, and the changes induced were investigated by means of infrared spectroscopy (IR) and X-ray powder dif...
Effect of SiO2/Al2O3 Ratio on the Thermal Reactions of Allophane
Allophane Dehydration Dehydroxylation DTA Silica/alumina ratio Thermal reactions
2012/2/8
Differences were found in the differential thermal analysis curves and in the temperatures of new-phase development between allophanes of high (1.91–1.99) and low (1.47–1.53) SiO2/Al2O3 ratios. The en...
New Stability Diagrams of some Phyllosilicates in the SiO2—Al2O3—K2O—H2O System
Phyllosilicates SiO2—Al2O3—K2O—H2O System New Stability Diagrams
2012/2/15
Aluminum is treated as a mobile, reactive component in newly designed stability diagrams for the SiO2—Al2O3—K2O—H2O system. The diagrams show that the stability field of kaolinite is strongly dependen...