|
Home |
| Browse | |
|
|
Communities & Collections |
|
|
Issue Date |
|
|
Author |
|
|
Title |
|
|
Subject |
| Sign on to: | |
|
|
Receive email updates |
|
|
My APO authorized users |
|
|
Edit Profile |
|
|
|
|
|
About DSpace |
ANSTO Publications Online >
Journal Publications >
Journal Articles >
Please use this identifier to cite or link to this item:
http://apo.ansto.gov.au/dspace/handle/10238/1473
|
| Title: | Anomalous lattice parameter increase in alkali earth aluminium substituted tungsten defect pyrochlores. |
| Authors: | Thorogood, GJ Kennedy, BJ Peterson, VK Elcombe, MM Kearley, GJ Hanna, JV Luca, V |
| Keywords: | Lattice Parameters Alkaline Earth Metal Compounds Pyrochlore Tungsten Neutron Diffraction Diffuse Scattering |
| Issue Date: | Mar-2009 |
| Publisher: | Elsevier |
| Citation: | Thorogood, G. J., Kennedy, B. J., Peterson, V. K., Elcombe, M. M., Kearley, G. J., Hanna, J. V., et al. (2009). Anomalous lattice parameter increase in alkali earth aluminium substituted tungsten defect pyrochlores. Journal of Solid State Chemistry, 182(3), 457-464. |
| Abstract: | The structures of the defect pyrochlores AAl(0.33)W(1.67)O(6) where A = K, Rb or Cs have been investigated using X-ray and neutron powder diffraction methods as well as the ab initio modelling program VASP The three cubic pyrochlores exhibit a non-linear increase in lattice parameter with respect to ionic radius of the A cation as a consequence of displacive disorder of the A-type cations. Solid state Al-27 MAS NMR studies of this pyrochlore system reveal shifts in the delta-21-22 ppm range that are indicative of pseudo-5 coordinate Al environments and emanate frorn distorted Al octahedral with one abnormally long Al. O bond. Solid state K-39, Rb-85, Rb-87 and Cs-133 MAS and static NMR Studies reflect the local cation disorder demonstrated in the structural Studies. © 2008, Elsevier Ltd. |
| URI: | http://dx.doi.org/10.1016/j.jssc.2008.11.014 http://apo.ansto.gov.au/dspace/handle/10238/1473 |
| ISSN: | 0022-4596 |
| Appears in Collections: | Journal Articles |
Files in This Item: There are no files associated with this item. |
Items in APO are protected by copyright, with all rights reserved, unless otherwise indicated.
|
DSpace Software Copyright © 2002-2010 Duraspace - Feedback |