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# Corundum Al2O3
Forces were calculated in the 2x2x1 supercell of the hexagonal lattice by VASP
with 500eV cutoff energy and 6x6x1 k-point mesh. Dielectric constant and Born
effective charge tensors were calculated with the hexagonal unit cell.
The Wyckoff positions are c and e, respectively, which can be found by
```bash
% phonopy -c POSCAR-unitcell --symmetry --pa=auto
```
`phonopy_disp.yaml` is created by
```bash
% phonopy -d --dim 2 2 1 --pa auto -c POSCAR-unitcell
```
The band structure is plotted using seekpath by
```bash
% phonopy-load --band auto -p
```
where seekpath can be installed by `pip install seekpath`.
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