scholarly journals An X-ray photoelectron spectroscopy study of the products of the interaction of gaseous IrF6 with fine UO2F2

2007 ◽  
Vol 22 (1) ◽  
pp. 3-10 ◽  
Author(s):  
Vladimir Prusakov ◽  
Yury Teterin ◽  
Nikolai Trotsenko ◽  
Konstantin Maslakov ◽  
Anton Teterin ◽  
...  
Keyword(s):  
Nuclear Fuel ◽  
Photoelectron Spectroscopy ◽  
Spent Nuclear Fuel ◽  
Model Reaction ◽  
Special Treatment ◽  
Spectroscopy Study ◽  
Gaseous Mixtures ◽  
X Ray ◽  
Sorption Column ◽  
Fuel Reprocessing

Nuclear fuel reprocessing by fluorination, a dry method of regeneration of spent nuclear fuel, uses UO2F2 for the separation of plutonium from gaseous mixtures. Since plutonium requires special treatment, IrF6 was used as a thermodynamic model of PuF6. The model reaction of the interaction of gaseous IrF6 with fine UO2F2 in the sorption column revealed a change of color of the sorption column contents from pale-yellow to gray and black, indicating the formation of products of such an interaction. The X-ray photoelectron spectroscopy study showed that the interaction of gaseous IrF6 with fine UO2F2 at 125 ?C results in the formation of stable iridium compounds where the iridium oxidation state is close to Ir3+. The dependence of the elemental compositions of the layers in the sorption column on the penetration depth of IrF6 was established.

The influence of hydrogen peroxide and hydrogen on the corrosion of simulated spent nuclear fuel

2015 ◽  
Vol 180 ◽  
pp. 283-299 ◽  
Author(s):  
Mayuri Razdan ◽  
David W. Shoesmith
Keyword(s):  
Nuclear Fuel ◽  
Photoelectron Spectroscopy ◽  
Spent Nuclear Fuel ◽  
Corrosion Potential ◽  
Surface Oxidation ◽  
Metal Particles ◽  
Chemical Dissolution ◽  
Convective Conditions ◽  
X Ray ◽  
Irreversible Oxidation

The synergistic influence between H2O2 and H2 on the corrosion of SIMFUEL (simulated spent nuclear fuel) has been studied in solutions with and without added HCO3−/CO32−. The response of the surface to increasing concentrations of added H2O2 was monitored by measuring the corrosion potential in either Ar or Ar/H2-purged solutions. Using X-ray photoelectron spectroscopy it was shown that the extent of surface oxidation (UV + UVI content) was directly related to the corrosion potential. Variations in corrosion potential with time, redox conditions, HCO3−/CO32− concentration, and convective conditions showed that surface oxidation induced by H2O2 could be reversed by reaction with H2, the latter reaction occurring dominantly on the noble metal particles in the SIMFUEL. For sufficiently large H2O2 concentrations, the influence of H2 was overwhelmed and irreversible oxidation of the surface to UVI occurred. Subsequently, corrosion was controlled by the chemical dissolution rate of this UVI layer.

Oxidation of Si(100) in nitric oxide at low pressures: An x-ray photoelectron spectroscopy study

1997 ◽  
Vol 70 (1) ◽  
pp. 63-65 ◽  
Author(s):  
A. Kamath ◽  
D. L. Kwong ◽  
Y. M. Sun ◽  
P. M. Blass ◽  
S. Whaley ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Photoelectron Spectroscopy ◽  
Spectroscopy Study ◽  
X Ray ◽  
Low Pressures
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