Pickup, David M. and Mountjoy, Gavin and Holland, Mark A. and Wallidge, Graham and Newport, Robert J. and Smith, Mark E. (2000) Structure of (Ta2O5)(x)(SiO2)(1-x) xerogels (x=0.05, 0.11, 0.18, 0.25 and 1.0) from FTIR, Si-29 and O-17 MAS NMR and EXAFS. Journal of Materials Chemistry, 10 (8). pp. 1887-1894. ISSN 0959-9428. (doi:https://doi.org/10.1039/b000947o) (Full text available)
A combination of Si-29 and O-17 MAS NMR, EXAFS and FT-IR spectroscopy has been used to study the atomic structure of (Ta2O5)(x)(SiO2)(1 - x) (x = 0.05, 0.11, 0.18 and 0.25) xerogels prepared by reacting partially-hydrolysed tetraethyl orthosilicate with tantalum(V) ethoxide. Amorphous tantala, a-Ta2O5, xerogels have also been prepared and their structures studied in detail for the first time. Results have shown that in all these materials, Ta adopts predominantly 5-fold coordination with respect to oxygen. For the mixed oxide xerogels, partial phase separation of the two component oxides occurs for x > 0.11.
|Divisions:||Faculties > Sciences > School of Physical Sciences > Functional Materials Group|
|Depositing User:||J.M. Smith|
|Date Deposited:||08 May 2009 13:42 UTC|
|Last Modified:||22 May 2014 11:15 UTC|
|Resource URI:||https://kar.kent.ac.uk/id/eprint/15952 (The current URI for this page, for reference purposes)|