Thank Pro. Gavin Abo and Pro. Mehmet Topsakal i just read paper "Calculating the effective U in APW methods. NiO // Georg K. H. Madsen and Pavel Novak"
For NiO , element Ni (3d^6 4s^2) - has 8 d electrons. we can make two calculations. One with 4.5 ↑, 4 ↓ and one with 4.5↑, 3 ↓ constrained d-electrons.Have put 8.5 and 7.5 electrons into the core. So for elements have filled eletrons (d^10)-d-fully filled . How can remove d electrons?
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