Mechanical and Thermal Properties for Uranium and U–6Nb Alloy from First-Principles Theory
Abstract
Elasticity, lattice dynamics, and thermal expansion for uranium and U–6Nb alloy (elastic moduli) are calculated from density functional theory that is extended to include orbital polarization (DFT+OP). Introducing 12.5 at.% of niobium, substitutionally, in uranium softens all the cii elastic moduli, resulting in a significantly softer shear modulus (G). Combined with a nearly invariant bulk modulus (B), the quotient B/G increases dramatically for U–6Nb, suggesting a more ductile material. Lattice dynamics from a harmonic model coupled with a DFT+OP electronic structure is applied for α uranium, and the obtained phonon density of states compares well with inelastic neutron-scattering measurements. The Debye temperature associated with the lattice dynamics falls within the range of experimentally observed Debye temperatures and it also validates our quasi-harmonic (QH) phonon model. The QH Debye–Grüneisen phonon method is combined with a DFT+OP electronic structure and used to explore the anisotropic thermal expansion in α uranium. The anomalous negative thermal expansion (contraction) of the b lattice parameter of the α-phase orthorhombic cell is relatively well reproduced from a free-energy model consisting of QH-phonon and DFT+OP electronic structure contributions.
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1815361
- Report Number(s):
- LLNL-JRNL-823214
Journal ID: ISSN 2076-3417; 1035808; TRN: US2213521
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Sciences
- Additional Journal Information:
- Journal Volume: 11; Journal Issue: 12; Journal ID: ISSN 2076-3417
- Publisher:
- MDPI
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; U-6Nb; elastic constants; negative thermal expansion; actinides; phonons
Citation Formats
Söderlind, Per, Yang, Lin H., Landa, Alexander, and Wu, Amanda. Mechanical and Thermal Properties for Uranium and U–6Nb Alloy from First-Principles Theory. United States: N. p., 2021.
Web. doi:10.3390/app11125643.
Söderlind, Per, Yang, Lin H., Landa, Alexander, & Wu, Amanda. Mechanical and Thermal Properties for Uranium and U–6Nb Alloy from First-Principles Theory. United States. https://doi.org/10.3390/app11125643
Söderlind, Per, Yang, Lin H., Landa, Alexander, and Wu, Amanda. Fri .
"Mechanical and Thermal Properties for Uranium and U–6Nb Alloy from First-Principles Theory". United States. https://doi.org/10.3390/app11125643. https://www.osti.gov/servlets/purl/1815361.
@article{osti_1815361,
title = {Mechanical and Thermal Properties for Uranium and U–6Nb Alloy from First-Principles Theory},
author = {Söderlind, Per and Yang, Lin H. and Landa, Alexander and Wu, Amanda},
abstractNote = {Elasticity, lattice dynamics, and thermal expansion for uranium and U–6Nb alloy (elastic moduli) are calculated from density functional theory that is extended to include orbital polarization (DFT+OP). Introducing 12.5 at.% of niobium, substitutionally, in uranium softens all the cii elastic moduli, resulting in a significantly softer shear modulus (G). Combined with a nearly invariant bulk modulus (B), the quotient B/G increases dramatically for U–6Nb, suggesting a more ductile material. Lattice dynamics from a harmonic model coupled with a DFT+OP electronic structure is applied for α uranium, and the obtained phonon density of states compares well with inelastic neutron-scattering measurements. The Debye temperature associated with the lattice dynamics falls within the range of experimentally observed Debye temperatures and it also validates our quasi-harmonic (QH) phonon model. The QH Debye–Grüneisen phonon method is combined with a DFT+OP electronic structure and used to explore the anisotropic thermal expansion in α uranium. The anomalous negative thermal expansion (contraction) of the b lattice parameter of the α-phase orthorhombic cell is relatively well reproduced from a free-energy model consisting of QH-phonon and DFT+OP electronic structure contributions.},
doi = {10.3390/app11125643},
journal = {Applied Sciences},
number = 12,
volume = 11,
place = {United States},
year = {Fri Jun 18 00:00:00 EDT 2021},
month = {Fri Jun 18 00:00:00 EDT 2021}
}
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