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Spontaneous formation of an ordered interstratification upon Ni-exchange of Na-fluorohectorite
Abstract Interstratified structures are a common phenomenon in layered silicates and the differentiation between random and ordered interstratifications might be in some cases difficult. Atypical basal spacings observed for Ni-exchanged fluorohectorites could be related to such an ordered interstratified structure. Applying powder X-ray diffraction, thermal gravimetric analysis, and various spectroscopic techniques, an ordered interstratification of smectite-like [Ni(H2O)6]2+ and condensed, chlorite-like [Ni(OH)2−y(H2O)y]x y+interlayers, where x refers to the degree of condensation, was observed. By simple ion exchange a corrensite-like structure was obtained with a structural formula of {[Ni(OH)0.83(H2O)1.17]0.37 1.17+}Int. 1{[Ni(H2O)6]0.28 2+}Int. 2[Mg5Li] < Si8 > O20F4. Improving the contrast between the two distinct d-spacings and between the electron densities of the interlayers by partial ion exchange with a long chain alkylammonium cation or thermal annealing, helped to increase the intensity of superstructure reflections rendering the ordered interstratified structures more clearly visible.
Graphical abstract Display Omitted
Highlights Ordered or random interstratifications as reason for atypical basal spacings as observed in Ni exchanged fluorohectorite. Spontaneous formation of an ordered interstratified, corrensite-like structure upon Ni exchange. Segregation of condensed chlorite-like [Ni(OH)0.83(H2O)1.17]0.37 1.17+-interlayers and smectite-like [Ni(H2O)6]0.28 2+-interlayers.
Spontaneous formation of an ordered interstratification upon Ni-exchange of Na-fluorohectorite
Abstract Interstratified structures are a common phenomenon in layered silicates and the differentiation between random and ordered interstratifications might be in some cases difficult. Atypical basal spacings observed for Ni-exchanged fluorohectorites could be related to such an ordered interstratified structure. Applying powder X-ray diffraction, thermal gravimetric analysis, and various spectroscopic techniques, an ordered interstratification of smectite-like [Ni(H2O)6]2+ and condensed, chlorite-like [Ni(OH)2−y(H2O)y]x y+interlayers, where x refers to the degree of condensation, was observed. By simple ion exchange a corrensite-like structure was obtained with a structural formula of {[Ni(OH)0.83(H2O)1.17]0.37 1.17+}Int. 1{[Ni(H2O)6]0.28 2+}Int. 2[Mg5Li] < Si8 > O20F4. Improving the contrast between the two distinct d-spacings and between the electron densities of the interlayers by partial ion exchange with a long chain alkylammonium cation or thermal annealing, helped to increase the intensity of superstructure reflections rendering the ordered interstratified structures more clearly visible.
Graphical abstract Display Omitted
Highlights Ordered or random interstratifications as reason for atypical basal spacings as observed in Ni exchanged fluorohectorite. Spontaneous formation of an ordered interstratified, corrensite-like structure upon Ni exchange. Segregation of condensed chlorite-like [Ni(OH)0.83(H2O)1.17]0.37 1.17+-interlayers and smectite-like [Ni(H2O)6]0.28 2+-interlayers.
Spontaneous formation of an ordered interstratification upon Ni-exchange of Na-fluorohectorite
Loch, Patrick (author) / Hunvik, Kristoffer William Bø (author) / Puchtler, Florian (author) / Weiß, Sebastian (author) / Seljelid, Konstanse Kvalem (author) / Røren, Paul Monceyron (author) / Rudic, Svemir (author) / Raaen, Steinar (author) / Knudsen, Kenneth Dahl (author) / Bordallo, Heloisa N. (author)
Applied Clay Science ; 198
2020-09-03
Article (Journal)
Electronic Resource
English
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