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|Title: ||Cation disorder in NaW2O6+delta center dot nH(2-z)O post-ion exchange with K, Rb, Sr, and Cs|
|Authors: ||Thorogood, GJ|
|Keywords: ||X-ray diffraction|
Nuclear Magnetic Resonance
|Issue Date: ||1-Jun-2011|
|Publisher: ||PERGAMON-ELSEVIER SCIENCE LTD|
|Citation: ||Thorogood, G.J., Kennedy, B.J., Avdeev, M., Peterson, V.K., Hanna, J.V., Luca, V. (2011). Cation disorder in NaW(2)O(6+delta)center dot nH(2-z)O post-ion exchange with K, Rb, Sr, and Cs. Journal of Physics and Chemistry of Solids, 72(6), 692-700.|
|Abstract: ||The structure of the defect pyrochlore NaW2O6+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 W2O6 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 W2O6 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. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.|
|Appears in Collections:||Journal Articles|
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