[Wien] How to get exact 25% doping ?

[Naseem Hassan]

Dear community Fellows

I created a 2*2*2 supercell and got 31 Cd atoms. I want to replace Cd atoms
by Zn atoms so that to get 25% of doping. 25% of 31 atoms is 7.75 which is
not a whole number. How to obtain whole number to get exact 25% of doping ?.

Thank You All
Naseem
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