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23 Jan 2018
06 Jun 2018
A supercell can be easily constructed by VESTA by the following steps:
1) Preparing the unit cell, e.g., in VASP POSCAR format
2) Select the menu "Edit" and then "unit cell"
3) Select the button "Trasform" and them enter you size of the supercell, e. g., 3x3x3 to the the diagonal elements of transformation matrix. Click OK
4) There is an option to export the coordinates in the VASP format.
Regarding the construction of the surface, you can follow the steps in the link below. It is comprehensively written by Emre S. Tasci.
Hopefully, these may help you.
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05 Apr 2019
Really good blog to get basic information. All the best.
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