authors: bishop, jessica , unger, ryan , john d. auxier ii ...-jessica-jl_inmmconfe.pdf · authors:...
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Figure 1: A ring of 99.96% pure electro-refined plutonium (LANL).
Isotope Ratio Mass Spectrometry
Electropolishing Heating
O0
→ Water vapor and atmospheric oxygen are
the most likely sources of oxygen in the oxide layer
Figure 4: Total oxygen content vs. temperature for three runs.
Figure 5: Oxygen fractionation vs. temperature for three runs.
Figure 6: Total oxygen content and oxygen fractionation split vs. time.
Equation 1: Isotopic fractionation of oxygen utilizing ratio of heavy to light isotopes in the sample as compared to International Atomic Energy Agency (IAEA) standards.
Figure 7: All possible sources of oxygen in the experiment. Rainwater was collected in Knoxville, TN and is representative of water vapor. Atmospheric oxygen is a global average (Kroopnick, P., & Craig, H., “Atmospheric oxygen: isotopic composition and solubility fractionation” Science, 175(4017), 54-55, (1972).)
Figure 8: Fractionation factor (derived from Eq. 1) of sample sources as compared to literature values (Bernstein).
O2-
O2-
Atmospheric Oxygen
Water Vapor
KOH solution
Oxidation States:
Figure 10: Log plot of CuO growth over temperature series.
Figure 9: Raman spectra of copper oxide growth with increasing temperature; Figure on left is samples from Run 1 and figure on right is samples from Runs 2 and 3.
Figure 2: Electropolishing experimental set up with 2 wt%KOH solution.
Figure 3: Carbolite furnace environment for accelerated aging and oxidation.
Authors: Bishop, Jessica1 , Unger, Ryan1 , John D. Auxier II 1,2,3, Maik Lang1,2, Howard L. Hall 1,2,31Department of Nuclear Engineering; 2UT Radiochemistry Center of Excellence; 3UT Institute for Nuclear Security at the University of
Tennessee, Knoxville
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2. M. P. Brady, et al.”Tracer Film Growth Study of Hydrogen and Oxygen from the Corrosion of Magnesium in Water,” J. Electrochem. Soc. 161(9): C395-C404, (2014); doi:10.1149/2.0821409jes
3. N. Bertrand, et al. “Iron Oxidation at Low Temperature (260 – 500°C) in Air and the Effect of Water Vapor,” Oxid Met 73:139-162, (2010); doi:10.1007/211085-009-9171-04. Bao, Huiming, et al. “Oxygen isotope fractionation in ferric oxide-water systems: Low temperature synthesis” Geochimica et Cosmochimica Acta, Vol. 63, No. 5, pp. 599–613, (1999).5. Shao-Kuan Lee, et al. “Oxidation Behavior of Copper at a Temperature below 300°C and the Methodology for Passivation” Materials Research 19(1): 51-56 (2016).6. Bernstein, Richard B., “Oxygen-18 Isotope Effect in the Reaction of Oxygen with Copper” The Journal of Chemical Physics, 23, 10, (1955).