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靜態(tài)計算時出現警告
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靜態(tài)計算時的INCAR如下: SYSTEM = ENCUT = ISTART = 0 ICHARG = 2 ISMEAR = -5 ISPIN = 2 NELM = 2000 EDIFF = 1E-4 IALGO = 48 LREAL = Auto GGA = 91 VOSKOWN = 1 但是在計算中出現警告如下: RMM: 22 -0.310967594429E+03 0.21293E+00 -0.24248E+00 10244 0.439E+00 0.422E+01 WARNING: DENTET: can't reach specified precision Number of Electrons is NELECT = 476.996768664236 RMM: 23 -0.310376643978E+03 0.59095E+00 -0.83636E-01 10268 0.266E+00 0.375E+01 RMM: 43 -0.309736141363E+03 0.53076E-02 -0.50929E-02 10165 0.574E-01 0.356E+00 RMM: 44 -0.309811626871E+03 -0.75486E-01 -0.48571E-02 10210 0.597E-01 0.369E+00 WARNING: DENTET: can't reach specified precision Number of Electrons is NELECT = 477.041023713897 RMM: 45 -0.309698348515E+03 0.11328E+00 -0.13902E-02 10260 0.310E-01BRMIX: very serious problems the old and the new charge density differ old charge density: 476.99930 new 477.04032 0.319E+00 WARNING: DENTET: can't reach specified precision Number of Electrons is NELECT = 476.985853390457 RMM: 46 -0.310016610388E+03 -0.31826E+00 -0.42439E-02 10215 0.447E-01BRMIX: very serious problems the old and the new charge density differ old charge density: 477.04032 new 476.98515 0.296E+00 RMM: 47 -0.309997772396E+03 0.18838E-01 -0.27267E-02 10259 0.413E-01BRMIX: very serious problems the old and the new charge density differ old charge density: 476.98515 new 476.99930 0.198E+00 RMM: 48 -0.310064999937E+03 -0.67228E-01 -0.44514E-02 10200 0.397E-01 0.171E+00 這些警告對電荷密度的結果有影響嗎?應該如何消除? |
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the reason for this error message (DENTET) is that the Fermi level cannot be determined accurately enough by the tetrahedron method (i.e, the integrated DOS stays different from the number of valence electrons) please try (one of) the following: --choose a different BZ integration scheme (ISMEAR) --if you want or have to keep the tetrahedron integration, -- increase the number of k-points (mind that Gamma has to be included in the k-mesh) -- increase NEDOS 以上是vasp論壇對此類問題的回復 大意是費米能級不能精確確定。解決辦法有如下三條: 1. 改變ISMEAR(如使用ISMEAR=0) 2. 增加K點 3. 增加NEDOS(DOS的采點個數) |
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