mirror of https://github.com/phonopy/phonopy.git
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Al2O3.py | ||
BORN | ||
FORCE_SETS | ||
POSCAR | ||
README | ||
band.conf |
README
Corundum Al2O3. Forces were calculated in the 2x2x2 supercell of the hexagonal lattice. The rhombohedral primitive cell is created from the hexagonal unit cell by the transformation matrix: [ 2/3 -1/3 -1/3] [ 1/3 1/3 -2/3] [ 1/3 1/3 1/3]. Dielectric constant and Born effective charge tensors were calculated by VASP 5 with the hexagonal unit cell. BORN for the rhombohedral primitive cell was created from the site-symmetres and following the mappings: - Atom-1 in primitive cell --> Atom-4 in hexagonal unit cell. - Atom-5 in primitive cell --> Atom-28 in hexagonal unit cell. The Wyckoff positions are c and a, respectively, which can be found by % phonopy --symmetry --pa="2/3 -1/3 -1/3 1/3 1/3 -2/3 1/3 1/3 1/3" The band structure is obtained by % phonopy -v -p band.conf --nac