Assessing exchange-correlation functionals for elasticity and thermodynamics of - : A density functional perturbation theory study
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Univ. of Nevada, Las Vegas, NV (United States). Dept. of Physics and Astronomy
Elastic and thermodynamic properties of negative thermal expansion (NTE) αα-ZrW2O8 have been calculated using PBEsol and PBE exchange-correlation functionals within the framework of density functional perturbation theory (DFPT). Measured elastic constants are reproduced within ~2% with PBEsol and 6% with PBE. The thermal evolution of the Grüneisen parameter computed within the quasi-harmonic approximation exhibits negative values below the Debye temperature, consistent with observation. The standard molar heat capacity is predicted to be C $$O\atop{P}$$=192.2 and 193.8 J mol-1K-1 with PBEsol and PBE, respectively. These results suggest superior accuracy of DFPT/PBEsol for studying the lattice dynamics, elasticity and thermodynamics of NTE materials.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5); USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC04-94AL85000; NA0003525
- OSTI ID:
- 1426799
- Alternate ID(s):
- OSTI ID: 1775632
- Report Number(s):
- SAND-2018-1173J; 660439; TRN: US1802452
- Journal Information:
- Chemical Physics Letters, Vol. 698; ISSN 0009-2614
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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First-Principles Structural, Mechanical, and Thermodynamic Calculations of the Negative Thermal Expansion Compound Zr 2 (WO 4 )(PO 4 ) 2
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