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Assessing exchange-correlation functionals for elasticity and thermodynamics of α - ZrW2 O8 : A density functional perturbation theory study

Journal Article · · Chemical Physics Letters
 [1];  [2];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. 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 Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5)
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1426799
Alternate ID(s):
OSTI ID: 1775632
Report Number(s):
SAND--2018-1173J; 660439
Journal Information:
Chemical Physics Letters, Journal Name: Chemical Physics Letters Vol. 698; ISSN 0009-2614
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

First-Principles Structural, Mechanical, and Thermodynamic Calculations of the Negative Thermal Expansion Compound Zr 2 (WO 4 )(PO 4 ) 2 journal November 2018
Infrared and Raman spectroscopy of α-ZrW 2 O 8 : A comprehensive density functional perturbation theory and experimental study journal May 2018
Molecular dynamics simulation of zirconium tungstate amorphization and the amorphous-crystalline interface journal November 2019

Figures / Tables (6)


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