Journal article
Gamma-point lattice free energy estimates from O(1) force calculations
Nano-Microstructures in Materials, Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark1
Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Department of Physics, Technical University of Denmark4
We present a new method for estimating the vibrational free energy of crystal (and molecular) structures employing only a single force calculation, for a particularly displaced configuration, in addition to the calculation of the ground state configuration. This displacement vector is the sum of the phonon eigenvectors obtained from a fast-relative to, e.g., density-functional theory (DFT)-Hessian calculation using interatomic potentials.
These potentials are based here on effective charges obtained from a DFT calculation of the ground state electronic charge density but could also be based on other, e.g., empiric approaches.
Language: | English |
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Publisher: | American Institute of Physics |
Year: | 2008 |
Pages: | 184708 |
ISSN: | 10897690 and 00219606 |
Types: | Journal article |
DOI: | 10.1063/1.2919122 |
ORCIDs: | Vegge, Tejs |
ALUMINUM AUGMENTED-WAVE METHOD DENSITY-FUNCTIONAL THEORY HYDROGEN STORAGE MOLECULES PHASES PSEUDOPOTENTIALS SOLIDS