Spontaneous formation of an ordered interstratification upon Ni-exchange of Na-fluorohectorite

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Loch, Patrick ; Hunvik, Kristoffer W. Bø ; Puchtler, Florian ; Weiß, Sebastian ; Seljelid, Konstanse Kvalem ; Røren, Paul Monceyron ; Rudic, Svemir ; Raaen, Steinar ; Knudsen, Kenneth Dahl ; Bordallo, Heloisa N. ; Fossum, Jon Otto ; Breu, Josef:
Spontaneous formation of an ordered interstratification upon Ni-exchange of Na-fluorohectorite.
In: Applied Clay Science. Bd. 198 (2020) . - 105831.
ISSN 0169-1317
DOI: https://doi.org/10.1016/j.clay.2020.105831

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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] Si-8 > 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.