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Radionuclide incorporation in negative thermal expansion α-Zr(WO4)2: A density functional theory study

Journal Article · · Chemical Physics Letters

The incorporation of uranium, plutonium and technetium in the negative thermal expansion (NTE) α-Zr (WO4)2 has been investigated within the framework of density functional theory (DFT). It is found that the vacancy formation energies of the charged vacancies are overall larger than that of its counterpart neutral Frenkel defects and Schottky defects. DFT calculations suggest that U and Pu substitutions for the Zr site are preferred in α-Zr (WO4)2. In case of Tc substitution, both Tc(IV) for the Zr site and Tc(VII) for the W site are considered under oxygen-poor and oxygen-rich conditions, while Tc(VII) substitution can be improved significantly by including Y2O3 (charge compensation).

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1617302
Alternate ID(s):
OSTI ID: 1703137
Report Number(s):
SAND--2019-14350J; 682693
Journal Information:
Chemical Physics Letters, Journal Name: Chemical Physics Letters Vol. 744; ISSN 0009-2614
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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