Dear all,<div><br /></div><div>I want to do slab calculations of anatase (101) TiO2, but I'm a bit unsure about the correct methodology to go from an experimental CIF to a slab calculation. My current procedure would be as follows:</div><div><br /></div><div>1) Optimize CUTOFF and REL_CUTOFF using the anatase unit cell from the experimental CIF file to make sure that the energies are converged. </div><div>2) Perform CELL_OPT to make sure the calculated lattice parameters are close to those observed experimentally.</div><div>3) Create a slab from the optimized unit cell (with ASE for example) and determine the optimal number of layers, vacuum thickness and the size of slab.</div><div><br /></div><div>My questions are the following:</div><div>1) Is my procedure correct?</div><div>2) Should I include k-point sampling or MULTIPLE_UNIT_CELL in any of the steps to get correct energies and lattice parameters?</div><div>3) Should I enable KEEP_ANGLES and KEEP_SYMMETRY in the CELL_OPT step?</div><div><br /></div><div>Thanks in advance!</div><div><br /></div><div>Kind regards,</div><div>Léon</div>
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