Bulk Properties of Transition Metals: A Challenge for the Design of Universal Density Functionals

详细信息    查看全文

• 作者：Patanachai Janthon ; Sijie (Andy) Luo ; Sergey M. Kozlov ; Francesc Vi帽es ; Jumras Limtrakul ; Donald G. Truhlar ; Francesc Illas
• 刊名：Journal of Chemical Theory and Computation
• 出版年：2014
• 出版时间：September 9, 2014
• 年：2014
• 卷：10
• 期：9
• 页码：3832-3839
• 全文大小：276K
• ISSN：1549-9626

文摘

Systematic evaluation of the accuracy of exchange-correlation functionals is essential to guide scientists in their choice of an optimal method for a given problem when using density functional theory. In this work, accuracy of one Generalized Gradient Approximation (GGA) functional, three meta-GGA functionals, one Nonseparable Gradient Approximation (NGA) functional, one meta-NGA, and three hybrid GGA functionals was evaluated for calculations of the closest interatomic distances, cohesive energies, and bulk moduli of all 3d, 4d, and 5d bulk transition metals that have face centered cubic (fcc), hexagonal closed packed (hcp), or body centered cubic (bcc) structures (a total of 27 cases). Our results show that including the extra elements of kinetic energy density and Hartree鈥揊ock exchange energy density into gradient approximation density functionals does not usually improve them. Nevertheless, the accuracies of the Tao鈥揚erdew鈥揝taroverov鈥揝cuseria (TPSS) and M06-L meta-GGAs and the MN12-L meta-NGA approach the accuracy of the Perdew鈭払urke鈭扙rnzerhof (PBE) GGA, so usage of these functionals may be advisable for systems containing both solid-state transition metals and molecular species. The N12 NGA functional is also shown to be almost as accurate as PBE for bulk transition metals, and thus it could be a good choice for studies of catalysis given its proven good performance for molecular species.