In situ study of the initial stages of oxidation of alloy u-6wt.% nb with angle resolved x-ray photoelectron spectroscopy (ARXPS)

In situ study of the initial stages of oxidation of alloy u-6wt.% nb with angle resolved x-ray photoelectron spectroscopy (ARXPS)

In this work the initial stages of oxidation of a uranium-base alloy (U - 6 wt.% Nb) during exposure to a UHV environment consisting primarily of H2O, CO and CO2 have been studied using the specific surface analysis technique of angled resolved X-ray photoelectron spectroscopy (ARXPS). Examination o...

Full description

Bibliographic Details
Main Authors: Embong, Zaidi, Younes, Charles M., Scott, Thomas B., Allen, Geoffery C.
Format: Article
Published: Penerbit UTHM 2009
Subjects:
QD Chemistry
Online Access:http://eprints.uthm.edu.my/546/
http://eprints.uthm.edu.my/546/1/JST_Vol12_F4.pdf
id uthm-546
recordtype eprints
spelling uthm-5462011-04-29T06:41:02Z In situ study of the initial stages of oxidation of alloy u-6wt.% nb with angle resolved x-ray photoelectron spectroscopy (ARXPS) Embong, Zaidi Younes, Charles M. Scott, Thomas B. Allen, Geoffery C. QD Chemistry In this work the initial stages of oxidation of a uranium-base alloy (U - 6 wt.% Nb) during exposure to a UHV environment consisting primarily of H2O, CO and CO2 have been studied using the specific surface analysis technique of angled resolved X-ray photoelectron spectroscopy (ARXPS). Examination of the sputter cleaned surface of the alloy has been performed at different take-off angles varying between 0° and 60° prior to and after a prolonged exposure to the UHV atmosphere for approximately 2 hours. The photoelectron spectra recorded for U 4f, Nb 3d and O 1s indicated that the adsorption and dissociation of H2O, CO and CO2 on the alloy surface first leads to the formation of UO2 intermixed with NbO. Other oxides including NbO2 and Nb2O5 along with hydroxyl compounds were clearly detected after exposure times exceeding one hour (360 L). The formation of a critical density of Nb2O5 at the metal-oxide interface is suggested to play a key role in preventing the diffusion of ionic species such as O- and OH– into the oxide-metal interface region, thus conferring a much higher resistance to oxidation and corrosion on the alloy, as compared with that of the unalloyed uranium metal. Penerbit UTHM 2009 Article PeerReviewed application/pdf http://eprints.uthm.edu.my/546/1/JST_Vol12_F4.pdf Embong, Zaidi and Younes, Charles M. and Scott, Thomas B. and Allen, Geoffery C. (2009) In situ study of the initial stages of oxidation of alloy u-6wt.% nb with angle resolved x-ray photoelectron spectroscopy (ARXPS). Journal of Science and Technology, 1 (1). pp. 43-55. ISSN 1985-8809 http://eprints.uthm.edu.my/546/
repository_type Digital Repository
institution_category Local University
institution Universiti Tun Hussein Onn Malaysia
building UTHM Institutional Repository
collection Online Access
topic QD Chemistry
spellingShingle QD Chemistry
Embong, Zaidi
Younes, Charles M.
Scott, Thomas B.
Allen, Geoffery C.
In situ study of the initial stages of oxidation of alloy u-6wt.% nb with angle resolved x-ray photoelectron spectroscopy (ARXPS)
description In this work the initial stages of oxidation of a uranium-base alloy (U - 6 wt.% Nb) during exposure to a UHV environment consisting primarily of H2O, CO and CO2 have been studied using the specific surface analysis technique of angled resolved X-ray photoelectron spectroscopy (ARXPS). Examination of the sputter cleaned surface of the alloy has been performed at different take-off angles varying between 0° and 60° prior to and after a prolonged exposure to the UHV atmosphere for approximately 2 hours. The photoelectron spectra recorded for U 4f, Nb 3d and O 1s indicated that the adsorption and dissociation of H2O, CO and CO2 on the alloy surface first leads to the formation of UO2 intermixed with NbO. Other oxides including NbO2 and Nb2O5 along with hydroxyl compounds were clearly detected after exposure times exceeding one hour (360 L). The formation of a critical density of Nb2O5 at the metal-oxide interface is suggested to play a key role in preventing the diffusion of ionic species such as O- and OH– into the oxide-metal interface region, thus conferring a much higher resistance to oxidation and corrosion on the alloy, as compared with that of the unalloyed uranium metal.
format Article
author Embong, Zaidi
Younes, Charles M.
Scott, Thomas B.
Allen, Geoffery C.
author_facet Embong, Zaidi
Younes, Charles M.
Scott, Thomas B.
Allen, Geoffery C.
author_sort Embong, Zaidi
title In situ study of the initial stages of oxidation of alloy u-6wt.% nb with angle resolved x-ray photoelectron spectroscopy (ARXPS)
title_short In situ study of the initial stages of oxidation of alloy u-6wt.% nb with angle resolved x-ray photoelectron spectroscopy (ARXPS)
title_full In situ study of the initial stages of oxidation of alloy u-6wt.% nb with angle resolved x-ray photoelectron spectroscopy (ARXPS)
title_fullStr In situ study of the initial stages of oxidation of alloy u-6wt.% nb with angle resolved x-ray photoelectron spectroscopy (ARXPS)
title_full_unstemmed In situ study of the initial stages of oxidation of alloy u-6wt.% nb with angle resolved x-ray photoelectron spectroscopy (ARXPS)
title_sort in situ study of the initial stages of oxidation of alloy u-6wt.% nb with angle resolved x-ray photoelectron spectroscopy (arxps)
publisher Penerbit UTHM
publishDate 2009
url http://eprints.uthm.edu.my/546/
http://eprints.uthm.edu.my/546/1/JST_Vol12_F4.pdf
first_indexed 2018-09-05T10:42:55Z
last_indexed 2018-09-05T10:42:55Z
_version_ 1610763914620960768

Similar Items