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Composition of Clinoptilolite Formed from Volcanic Glass during Burial Diagenesis
Burial Diagenesis Cation Exchange Clinoptilolite Volcanic Glass Zeolite
2011/12/2
Abstract: The composition of clinoptilolite formed from volcanic glass was investigated from cuttings collected from the offshore MITI-Somaoki borehole, 52 km east of Soma City, Japan. Unaltered volca...
Hydrothermal Conversion of Trachytic Glass to Zeolite. 3. Monocationic Model Glasses
Analcime Chabazite Glass-to-Zeolite Conversion Phillipsite Synthesis Trachytic Glasses Zeolite Synthesis
2011/12/7
Abstract: Experiments on zeolitization were conducted on four synthetic monocationic glasses (Na, K, Ca, or Mg-rich glass) with Si/Al molar ratios of 2.67, similar in acidity to many volcanic glasses ...
Energy barriers to viscous flow and the prediction of glass transition temperatures of molten silicates
Energy barriers viscous flow glass transition temperatures molten silicates
2012/3/31
Within the framework of the Adam-Gibbs (configurational entropy) theory of viscosity,it is shown that for a given composition, the ratio of parameters Be
(a temperature inde-pendent constant) to Sc( ...
Temperature dependence of the OH- absorption in the SiO2 glass and melt to 1975 K
Temperature dependence OH- absorption SiO2 glass
2012/3/31
FTIR absorbance spectra of SiO2 glass containing 1200 ppm OH2 groups were recorded in situ to 1975 K. There are only minor changes in peak height to 1700 K, indicating that the molar extinction coeffi...
Analytical Electron Microscopic Study of the Noncrystalline Products Formed at Early Weathering Stages of Volcanic Glass
Formation Process Halloysite Noncrystalline Material Pumice Weathering Product
2011/12/22
Abstract: Formation processes of weathering products of pumice collected from a rhyolitic pyroclastic flow deposit were investigated by X-ray powder diffraction (XRD), scanning electron microscopy (SE...
Phosphorus speciation changes across the glass transition in polymerized alkali silicate glasses and melts
Phosphorus speciation glass transition alkali silicate glasses melts
2012/4/9
In situ, high-temperature Raman spectroscopy of Na,O.9SiO, glasses and melts with and without 2 mol% P,05 has been conducted to 1491 K (near the liquidus temperature). In the temperature range from 29...
Cation Exchange Capacity of Layer Silicates and Palagonitized Glass in Mafic Volcanic Rocks: A Comparative Study of Bulk Extraction and In Situ Techniques
Cation Exchange Capacity Corrensite Electron microprobe analysis Extractable cations Palagonite Smectite
2011/12/27
The cation exchange capacities (CEC) and extractable cations in smectite, corrensite and palagonitized glass from hydrothermally-altered pillow lavas and hyaloclastite breccias were measured by both b...
High-precision analysis of hydrous rhyolitic glass inclusions in quartz phenocrysts using the electron microprobe and INAA
High-precision analysis hydrous rhyolitic glass quartz phenocrysts electron microprobe INAA
2012/4/6
Ahigh-precision electron microprobe(EMP) technique hasbeendeveloped that is ca-pableofanalyzing major,minor,and trace element abundances (Si,Ti,AI,Fe,Mn,Mg,
Ca,Na,K,Cl)in hydrous rhyolitic glasses.Th...
Formation of Hydrotalcite-like Compounds During R7T7 Nuclear Waste Glass and Basaltic Glass Alteration
Basaltic glass Experimental alteration Hydrotalcite-like compounds MgCl2-CaCl2 salt solution R7T7 nuclear waste glass Saponite
2011/12/29
Alteration experiments have been performed using RTT7 and synthetic basaltic glasses in MgCl2-CaCl2 salt solution at 190∑C. The duration of experiments ranged from 0.25 to 463 days. The alteration pro...
Synthesis of Smectite from Volcanic Glass at Low Temperature
Low temperature Smectite Sodium hydroxide concentration Synthesis Volcanic glass Zeolites
2011/12/30
Smectite and zeolites were formed from a volcanic glass as the products of reaction with NaOH solution at 90°C and 100°C under atmospheric pressure. Formation conditions of smectite and various zeolit...
Formation of Allophane and Beidellite During Hydrothermal Alteration of Volcanic Glass Below 200°C
Allophane Amorphous aluminum-silicate coating Experimental alteration Smectite Transitional material Volcanic glass
2011/12/31
Experimental alteration of volcanic glass has been carried out in distilled water at 200°C and 150°C. The formation and transformation processes of alteration products have been examined by scanning e...
Structural Water in Volcanic Glass
Glass Heavy-ion Rutherford scattering High-resolution transmission electron microscopy Structural water
2011/12/1
Abstract: High-resolution transmission electron microscopy has revealed spherical and hemispherical structures on the surface of partly hydrated volcanic and synthetic glasses. These structures contra...
Secondary Phase Formation during Nuclear Waste-Glass Dissolution
Dissolution Glass Hydration Manganese oxide Nuclear waste Serpentine Smectite Uranium
2012/1/5
Secondary minerals formed during simulated weathering of nuclear waste #asses have been identified by analytical electron microscopy. A complete description of the reacted #ass, from the outermost sur...
Kinetics of Glass Dissolution and Zeolite Formation Under Hydrothermal Conditions
Clinoptilolite Dissolution Kinetics Mordenite Phillipsite Synthesis Volcanic glass Zeolite
2012/2/8
After a temperature-dependent period when little dissolution occurs, the dissolution of rhyolitic glass can be described by dC/dt = k(Cs − C), where Cs is the concentration of dissolved silica a...
Electrochemical Modifications in Kaolinite-Glass Bead Plugs
Electrochemical Modifications Kaolinite Glass Plugs
2012/2/15
Electrochemical treatment of kaolinite-glass bead plugs in the presence of water and CaCl2 solutions produces dissolution of the glass beads, corrosion of the anodes, and transport of the released ele...