Structural and compositional variations in Ta3N5 produced by high-temperature ammonolysis of tantalum oxide
Structural and compositional variations in Ta3N5 produced by high-temperature ammonolysis of tantalum oxide
A series of samples of Ta3N5 (Cmcm, a = 3.89 Å, b = 10.22 Å, c = 10.28 Å) have been produced by high temperature ammonolysis of amorphous tantalum oxide under various temperature and heating time regimes. These were characterised by powder diffraction (x-ray and neutron), combustion microanalysis, thermogravimetric analysis and transmission electron microscopy. All samples were found to contain oxide in the 3-coordinate anion site and the b-axis length was sensitive to compositional variation. Samples heated for longer times at higher temperatures were anion deficient. The compositions of the samples have been related to their optical band gap UV-visible spectra. This work highlights the importance of careful compositional analysis when samples of nitride materials are produced for real-world applications.
tantalum nitride, non-stoichiometry, oxide, powder neutron diffraction, band gap
3518-3524
Henderson, Stuart J.
826c12ca-263f-4fb7-84a8-98bd1d025a10
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
November 2006
Henderson, Stuart J.
826c12ca-263f-4fb7-84a8-98bd1d025a10
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Henderson, Stuart J. and Hector, Andrew L.
(2006)
Structural and compositional variations in Ta3N5 produced by high-temperature ammonolysis of tantalum oxide.
Journal of Solid State Chemistry, 179 (11), .
(doi:10.1016/j.jssc.2006.07.021).
Abstract
A series of samples of Ta3N5 (Cmcm, a = 3.89 Å, b = 10.22 Å, c = 10.28 Å) have been produced by high temperature ammonolysis of amorphous tantalum oxide under various temperature and heating time regimes. These were characterised by powder diffraction (x-ray and neutron), combustion microanalysis, thermogravimetric analysis and transmission electron microscopy. All samples were found to contain oxide in the 3-coordinate anion site and the b-axis length was sensitive to compositional variation. Samples heated for longer times at higher temperatures were anion deficient. The compositions of the samples have been related to their optical band gap UV-visible spectra. This work highlights the importance of careful compositional analysis when samples of nitride materials are produced for real-world applications.
This record has no associated files available for download.
More information
Submitted date: 21 March 2006
Published date: November 2006
Keywords:
tantalum nitride, non-stoichiometry, oxide, powder neutron diffraction, band gap
Identifiers
Local EPrints ID: 43290
URI: http://eprints.soton.ac.uk/id/eprint/43290
ISSN: 0022-4596
PURE UUID: 16a79055-9bb1-46da-a498-c900ed4ef913
Catalogue record
Date deposited: 22 Jan 2007
Last modified: 16 Mar 2024 02:53
Export record
Altmetrics
Contributors
Author:
Stuart J. Henderson
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
