<div dir="ltr">Hi<div>How to construct and imply a 2x2x2 supercell for ibrav=2 i.e. cubic fcc lattice of rock-salt NaCl type structure having space group 225.<br>also suggest how to get atomic position for it. My single unit cell input file is as <br> <br>&CONTROL<br>                calculation = 'scf' ,<br>               restart_mode = 'from_scratch' ,<br>                     outdir = '/OUT PUT DIR' ,<br>                 pseudo_dir = '/TEMP' ,<br>                     prefix = 'ppppp' ,<br>                    <br> /<br> &SYSTEM<br>                      ibrav = 2,<br>                  celldm(1) = 9.07124,<br>                        nat = 2,<br>                       ntyp = 2,<br>                    ecutwfc = 60.0 ,<br>                    ecutrho = 500.0 ,<br>                space_group = 225 ,<br> /<br> &ELECTRONS<br>                   conv_thr = 1.0d-8 ,<br>                mixing_mode = 'plain' ,<br>                <br> /<br>ATOMIC_SPECIES<br>  Cd 112.41100 Cd.pbe-dn-rrkjus_psl.0.3.1.UPF <br>   O  16.00000 O_pbe_v1.2.uspp.F.UPF <br>ATOMIC_POSITIONS crystal_sg <br>  Cd     0.000000000   0.000000000   0.000000000   <br>   O     0.500000000   0.500000000   0.500000000   <br>K_POINTS automatic <br> 12 12 12  0 0 0 <br><br><br></div>
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