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Cation and vacancy disorder in U1−yNdyO2.00−x alloys

Published online by Cambridge University Press:  14 September 2015

Rozaliya I. Barabash ,
Stewart L. Voit ,
Dilpuneet S. Aidhy ,
Seung Min Lee ,
Travis W. Knight ,
David J. Sprouster  and
Lynne E. Ecker
Rozaliya I. Barabash*
Affiliation:
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
Stewart L. Voit
Affiliation:
Fuel Cycle and Isotopes Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
Dilpuneet S. Aidhy
Affiliation:
Department of Mechanical Engineering, University of Wyoming, Laramie, WY 82071, USA
Seung Min Lee
Affiliation:
Nuclear Engineering Department, College of Engineering and Computing, The University of South Carolina, Columbia, South Carolina 29208, USA
Travis W. Knight
Affiliation:
Nuclear Engineering Department, College of Engineering and Computing, The University of South Carolina, Columbia, South Carolina 29208, USA
David J. Sprouster*
Affiliation:
Nuclear Science and Technology Department, Brookhaven National Laboratory, Upton, New York 11973, USA
Lynne E. Ecker
Affiliation:
Nuclear Science and Technology Department, Brookhaven National Laboratory, Upton, New York 11973, USA
*
a)Address all correspondence to these authors. e-mail: rbarabas@utk.edu
b)e-mail: dsprouster@bnl.gov
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Abstract

In the present article, the intermixing and clustering of U/Nd, O, and vacancies were studied by both laboratory and synchrotron-based x-ray diffraction in U1−yNdyO2−x alloys. It was found that an increased holding time at the high experimental temperature during initial alloy preparation results in a lower disorder of the Nd distribution in the alloys. Adjustment of the oxygen concentration in the U1−yNdyO2−x alloys with different Nd concentrations was accompanied by the formation of vacancies on the oxygen sublattice and a nanocrystalline component. The lattice parameters in the U1−yNdyO2−x alloys were also found to deviate significantly from Vegard's law when the Nd concentration was high (53%) and decreased with increasing oxygen concentration. Such changes indicate the formation of large vacancy concentrations during oxygen adjustment at these high temperatures. The change in the vacancy concentration after the oxygen adjustment was estimated relative to Nd concentration and oxygen stoichiometry.

Keywords

x-ray diffraction (XRD)alloynuclear materials
Type
Invited Feature Paper
Information
Journal of Materials Research , Volume 30 , Issue 20 , 28 October 2015 , pp. 3026 - 3040
Copyright
Copyright © Materials Research Society 2015 

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References

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