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Surface energies of simple metals from slabs: Comparison of exchange‐correlation density functionals
Author(s) -
Fiolhais Carlos,
Almeida L. M.
Publication year - 2004
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.20321
Subject(s) - jellium , pseudopotential , local density approximation , simple (philosophy) , surface (topology) , chemistry , density functional theory , slab , series (stratigraphy) , molecular physics , computational chemistry , physics , electron , atomic physics , quantum mechanics , mathematics , geometry , paleontology , philosophy , epistemology , geophysics , biology
Abstract Surface energies of some simple metals (Be, Al, Mg, Li, and Na) were calculated within density functional theory. Various approximations for the exchange and correlation were tested: local density approximation (LDA), generalized gradient approximations (GGA), and meta–generalized gradient approximation (MGGA). We used the Crystal98 code to calculate slabs with one to 10 layers using both all‐electron and pseudopotential approaches. The extraction of the surface energy from the series of slab energies was done by the linear‐fitting method. Our LDA and GGA results agree reasonably well with those from other authors. The MGGA values are, in general, close to LDA and higher than GGA ones, a pattern also observed in the jellium model. They also agree reasonably well with the experimental data. © 2004 Wiley Periodicals, Inc. Int J Quantum Chem, 2005