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

Pickup, David M., Mountjoy, Gavin, Holland, Mark A., Wallidge, Graham, Newport, Robert J., 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:10.1039/b000947o) (KAR id:15952)

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Official URL: http://dx.doi.org/10.1039/b000947o

Abstract

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.

Item Type:	Article
DOI/Identification number:	10.1039/b000947o
Subjects:	Q Science
Divisions:	Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User:	J.M. Smith
Date Deposited:	08 May 2009 13:42 UTC
Last Modified:	16 Nov 2021 09:53 UTC
Resource URI:	https://kar.kent.ac.uk/id/eprint/15952 (The current URI for this page, for reference purposes)

University of Kent Author Information

Pickup, David M..

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Mountjoy, Gavin.

Creator's ORCID:	https://orcid.org/0000-0002-6495-2006
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Newport, Robert J..

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