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[求助] 求助vasp电子步不收敛

初学vasp,最近有个问题困扰了很久了。我计算的是单原子Pd吸附在Al2O3表面上,但是光算al2o3表面没问题,很快就收敛了,一旦加上Pd原子,电子步就非常难收敛,大部分都是跑满了60步也不收敛,尝试过逐渐提高精度来逼近也没有效果。求助该如何解决。
INCAR
AL2O3
ENCUT = 400
ISTART = 1
ICHARG = 1
ISMEAR =1
SIGMA = 0.06
NSW = 200
IBRION = 2
POTIM = 0.5
EDIFF = 1E-4
EDIFFG = -0.05
PREC = Accurate
NELM = 100
NELMIN = 5
GGA = 91
VOSKOWN = 1
NPAR = 4

k点
al2o3
0
Monkhorst-Pack
3   3   1
0   0   0

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