Spontaneous formation of an ordered interstratification upon Ni-exchange of Na-fluorohectorite
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Spontaneous formation of an ordered interstratification upon Ni-exchange of Na-fluorohectorite. / Loch, Patrick; Hunvik, Kristoffer William Bo; Puchtler, Florian; Weiss, Sebastian; Seljelid, Konstanse Kvalem; Roren, Paul Monceyron; Rudic, Svemir; Raaen, Steinar; Knudsen, Kenneth Dahl; Bordallo, Heloisa N.; Fossum, Jon Otto; Breu, Josef.
In: Applied Clay Science, Vol. 198, 105831, 15.11.2020.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Spontaneous formation of an ordered interstratification upon Ni-exchange of Na-fluorohectorite
AU - Loch, Patrick
AU - Hunvik, Kristoffer William Bo
AU - Puchtler, Florian
AU - Weiss, Sebastian
AU - Seljelid, Konstanse Kvalem
AU - Roren, Paul Monceyron
AU - Rudic, Svemir
AU - Raaen, Steinar
AU - Knudsen, Kenneth Dahl
AU - Bordallo, Heloisa N.
AU - Fossum, Jon Otto
AU - Breu, Josef
PY - 2020/11/15
Y1 - 2020/11/15
N2 - 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.
AB - 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.
KW - Ni-exchange
KW - Smectite
KW - Fluorohectorite
KW - Ordered interstratification
KW - Chlorite
KW - Corrensite
U2 - 10.1016/j.clay.2020.105831
DO - 10.1016/j.clay.2020.105831
M3 - Journal article
VL - 198
JO - Applied Clay Science
JF - Applied Clay Science
SN - 0169-1317
M1 - 105831
ER -
ID: 255161798