Importance of atomic-like basis set optimization for DFT modelling of nanomaterials
Автор: Anikina E.V., Balyakin I.A., Beskachko V.P.
Рубрика: Физика
Статья в выпуске: 2 т.11, 2019 года.
Бесплатный доступ
Atomic-like orbital basis sets allow efficient calculation of nanomaterial’s surface properties within the density functional theory. However, unlike plane wave basis sets, they require thorough optimization on a reference system before modelling systems of interest. We considered the basis set optimization procedure for several structures: bulk tantalum carbide, oxygen molecule, bulk lithium, and α-carbyne. We showed that during the optimization procedure not only the total energy of a reference system should be monitored but other physical characteristics (bond length and atomic charges) too. Moreover, optimal basis parameters could not correspond to the minimum total energy of a reference system to get the correct physical properties. We obtained optimal orbital parameters, which can be used for modelling of the following systems: oxygen adsorption on tantalum carbide surface, and Li-functionalized carbyne. Considering oxygen adsorption on TaC surface and Li-functionalization of carbyne, we also demonstrated that the basis set optimization influences binding energies and atomic charges of an adsorbent and a surface.
Density functional theory, atomic-like basis set, projector-augmentedwave method, adsorption
Короткий адрес: https://sciup.org/147232813
IDR: 147232813 | DOI: 10.14529/mmph190206
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