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1¡¢castep¶¼ÊÇ»ùÓÚØÍÊÆÆ½Ãæ²¨½øÐмÆËãµÄÂð£¿ËüÀïÃæµÄ»ù×é¶¼ÊÇÆ½Ã沨»ù×飬ֻÊÇͨ¹ý¼ÆËãµÄEnergy cutoffÈ¥µ÷½Ú»ù×éµÄ´óС½øÐмÆËãÂð£¿È»ºóØÍÊÆ´óСҲµÈÓڽضÏÄÜÁ¿Âð£¿
2¡¢¿´µ½Ò»ÆªÎÄÏ×ÖУ¬ÓÐÕâÑùÒ»¶ÎÃèÊö£¬For each structure, the cell parameters and atomic positions
were relaxed using the density functional theory and
the generalized gradient approximation (GGA) to the exchange-
correlation functional as proposed by Perdew
et al. (1996, PBE functional). The ionic cores were described
by the ultrasoft pseudopotentials Fe.pbe-nd-rrkjus.
UPF, O.pbe-rrkjus.UPF, H.pbe-rrkjus.UPF and the
norm-conserving pseudopotential Al.pbe-rrkj.UPF from
http://www.quantum-espresso.org. The wave-functions
and the charge density were expanded in plane-waves with
40 and 480 Ry cutoffs, respectively (1 Ry = 13.606 eV).
Increasing the wave-functions cutoff to 60 Ry does not
change the total energy by more than 12 meV/atom and
provides the same relative variations of the lattice parameters.
For the electronic integration, the Brillouin zone was
sampled according to the Monkhorst¨CPack scheme (Monkhorst
and Pack, 1976), using k-point grids consistent with
the supercell dimensions. k-point grids of 4  4  4 and
2  2  4 were used for the 1  1  1 and 2  2  1 rhombohedral
cells, respectively, while a 4  4  2 k-point grid
was used for the hexagonal unit-cell. This number of kpoints
is large enough to provide fully converged results.
Atomic relaxations were performed with the PWscf code£¬
ûÓиãÇå³þÆäÖÐThe wave-functions
and the charge density were expanded in plane-waves with
40 and 480 Ry cutoffs, respectively (1 Ry = 13.606 eV).ÖÐÊÇ˵µçºÉÃܶȵĵĽضÏÄÜÁ¿ÊÇ480Ry£¬»¹ÊÇʲô£¿
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