搜索结果: 1-9 共查到“地质学 Dioctahedral Smectites”相关记录9条 . 查询时间(0.078 秒)
A Model for the Mechanism of Fe3+ to Fe2+ Reduction in Dioctahedral Smectites
CMS Source Clay SWa-1 Dioctahedral Smectite Iron Reduction Structural Formula
2011/12/5
Abstract: A model to compensate the 2:1 layer having excess negative charge owing to the reduction of Fe3+ to Fe2+ by sodium dithionite buffered with citrate-bicarbonate in nontronite, beidellite, and...
The Near-Infrared Combination Band Frequencies of Dioctahedral Smectites, Micas, and Illites
Al content Dioctahedral smectites Micas NIR spectra
2011/12/30
The highest frequency near-infrared (NIR) combination bands for specimens of four species of mica—montmorillonite-beidellite, illite, chlorite, and kaolinite—were correlated with respect to Al2O3 cont...
Effects of Layer Charge, Charge Location, and Energy Change on Expansion Properties of Dioctahedral Smectites
Charge location Ethylene glycol Expanded phase Expansion energy Glycerol Layer charge Relative humidity Smectite
2011/12/1
Abstract: Expansion properties of ten homoionic smectites that differed in amount and location of layer charge were examined by X-ray powder diffraction analysis at various relative humidities, or aft...
Distribution of Ca and Na Ions in Dioctahedral Smectites and Interstratified Dioctahedral Mica/Smectites
Demixing Exchangeable cations Interstratified mica/smectite Relative humidity Smectite Water X-ray powder diffraction
2011/11/30
Abstract: The structures of 11 smectites and 2 interstratified mica/smectites containing mainly Ca2+ and Na+ as exchangeable cations in variable ratio were studied under a relative humidity of about 4...
Effects of Reduction and Reoxidation of Structural Iron on the Surface Charge and Dissolution of Dioctahedral Smectites
Dissolution Iron Nontronite Oxidation Reduction Smectite Surface area
2012/2/6
The effect of Fe oxidation state on the surface charge (CEC) and solubility of smectites were studied using the <2-祄, Na+-saturated fraction of an Upton, Wyoming; a Czechoslovakian; and a New Zealand ...
Reaction Series for Dioctahedral Smectites
Beidellite Cookeite Hydrothermal Mixed-layer Rectorite Sudoite Tosudite
2012/2/10
Several dioctahedral clay minerals are related through reaction series. These series can be produced hydrothermally from beidellite gel and montmorillonite by making simple changes in interlayer and s...
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...
Mossbauer spectra of 15 smectites were investigated. In these samples, ferric iron occupies both M(1) and M(2) octahedral sites, the distribution being partly determined by the relative covalency of t...
Reduction and Oxidation of Fe3+ in Dioctahedral Smectites—1: Reduction with Hydrazine and Dithionite
Reduction Oxidation Dioctahedral Smectites Hydrazine Dithionite
2012/2/13
Hydrazine and dithionite, both of which are strong reducing agents, react differently with various dioctahedral smectites. Both the nature of the reducing agent and the structure of the clay affect th...