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Dear all,
How can I calculate the oxygen vacancy in -2 charge state in CuO? Is it correct to change the NELECT-tag by increasing two electrons? If so, how can I do to differ the frenkel defect between neutral copper vacancy and interstitial and negative copper vacancy and positive interstitial? They both have zero net charge.
Thank you!

as vasp is not based on localized wavefunctions, any charge added to the cell cannot be assigned to a particular site. You can however check where the charge is localized by having a look at the charge density differences of the converged, self-consistent charges of the neutral and the charged cells