期刊
JOURNAL OF COMPUTATIONAL CHEMISTRY
卷 43, 期 7, 页码 448-456出版社
WILEY
DOI: 10.1002/jcc.26804
关键词
basis set superposition error; computational uncertainty; density functional error; ionic liquids; molecular crystals; phonons; quasi-harmonic approximation
资金
- Grantova Agentura Ceske Republiky [19-04150Y]
- Ministry of Education, Youth and Sports
- Czech Science Foundation
Five ionic liquids were used to benchmark the performance of quasi-harmonic DFT calculations, with PBE-D3 combined with a triple-zeta GTO basis set often yielding the most accurate predictions. The error cancellation between basis set superposition and PBE imperfections strongly affects the overall accuracy, unlike B3LYP/GTO calculations, hindering systematic convergence towards higher accuracy.
Five ionic liquids are selected for benchmarking the performance of quasi-harmonic density functional theory (DFT) calculations of structural, phonon, and thermodynamic properties of their crystals. Data predicted by individual computational setups are sorted, establishing a distinct hierarchy among the first-principles approaches. PBE-D3 and B3LYP-D3 functionals are coupled with various plane wave and Gaussian-type orbital (GTO) basis sets. Propagation of the basis set superposition error and of the imperfections of both functionals into finite-temperature properties is discussed in detail. PBE-D3 together with a triple-zeta GTO basis set often yields the most accurate predictions of predicted molar volume and heat capacity with errors at 1% and 8%, respectively, representing the state-of-the-art for quasi-harmonic DFT calculations for crystalline ionic liquids. Fortuitous error cancellation between the basis-set superposition (overbinding) and PBE imperfection (overexpanding) strongly affects the overall accuracy, unlike the case of B3LYP/GTO calculations, impeding systematic convergence of the methodology towards higher accuracy.
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