| Xiaoli WangRietveld Refinement of Structural Parameters of Dioctahedral Smectites |
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| | voorkant | achterkant |
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ISBN: | 978-3-8440-6119-2 |
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Reeks: | Materialwissenschaft |
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Trefwoorden: | Dioctahedral smectites; Rietveld method; Turbostratic disorder; Crystal structure |
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Soort publicatie: | Dissertatie |
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Taal: | Engels |
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Pagina's: | 172 pagina's |
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Gewicht: | 255 g |
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Formaat: | 21 x 14,8 cm |
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Bindung: | Softcover |
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Prijs: | 48,80 € / 61,10 SFr |
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Verschijningsdatum: | Augustus 2018 |
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Kopen: | |
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Samenvatting | Turbostratically disordered structures like smectites can be treated within the Rietveld method by a supercell approach. However, the refinement of some important structural features, such as interlayer site occupation as a measure for layer charge density, proportion of cis- and trans-vacant layers and the octahedral site occupancy by iron have not been done successfully yet. A structural model containing the atomic coordinates of 2:1 layers and an interstratified structure consisting of cis- and trans-vacant layers was chosen. The Rietveld refinement was primarily carried on the simulated patterns. The same model was applied on purified montmorillonite and beidellite samples. A specific model was used for purified nontronite samples owing to the high iron content. Finally, these two structural models were applied on smectite-rich samples with natural impurities, e.g. bentonites without previous purification. All samples were exchanged with Cu-triethylenetetramine to avoid the problems of unknown cation species and complex hydration behavior in the interlayer.
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