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Cation disorder in NaW2O6+δ·nH2−zO post-ion exchange with K, Rb, Sr, and Cs
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Thorogood, Gordon J., Kennedy, Brendan J., Avdeev, Maxim, Peterson, Vanessa K., Hanna, John V. and Luca, Vittorio (2011) Cation disorder in NaW2O6+δ·nH2−zO post-ion exchange with K, Rb, Sr, and Cs. Journal of Physics and Chemistry of Solids, Vol.72 (No.6). pp. 692-700. doi:10.1016/j.jpcs.2011.02.018
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Official URL: http://dx.doi.org/10.1016/j.jpcs.2011.02.018
Abstract
The structure of the defect pyrochlore NaW(2)O(6+delta)center dot nH(2-z)O after ion exchange with K, Rb, Sr or Cs for Na has been investigated using thermal analysis, solid-state nuclear magnetic resonance, laboratory X-ray and neutron diffraction methods. Neutron diffraction studies show that both the A-type cations (Na(+), K(+), Rb(+), and/or Cs(+)) and the water molecules reside within the channels that form in the 111 direction of the W(2)O(6) framework and that these strongly interact. The analytical results suggest that the water and A-type cations compete for space in the tunnels within the W(2)O(6) pyrochlore framework, with the total number of water molecules and cations being approximately constant in the six samples investigated. The interplay between the cations and water explains the non-linear dependence of the a lattice parameter on the choice of cation. It appears that the ion-exchange capacity of the material will be controlled by the amount of water initially present in the sample.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Neutrons -- Scattering, X-rays -- Diffraction, Magnetic resonance imaging, Oxides, Cations | ||||
| Journal or Publication Title: | Journal of Physics and Chemistry of Solids | ||||
| Publisher: | Elsevier Ltd. | ||||
| ISSN: | 00223697 | ||||
| Official Date: | June 2011 | ||||
| Dates: |
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| Volume: | Vol.72 | ||||
| Number: | No.6 | ||||
| Page Range: | pp. 692-700 | ||||
| DOI: | 10.1016/j.jpcs.2011.02.018 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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