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[求助]
vasp計(jì)算出錯(cuò),求指教
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vasp計(jì)算fe體系,超胞,54原子,計(jì)算到最后,顯示error fexcf:supplied exchange-correlation table is too small,maximal index:50334.請問這個(gè)是什么問題呢?同時(shí)上面的zbrent:accuracy dongt reached。 不知道是不是我的incar文件寫的有問題,因此把incar也文件也貼出來,還請大神指教: encut=500,Ispin=2,magmom=3*54,I start =0,I algo=38,GGA=PE,Lreal=.F.,I smear=0,sigma=0.1,I charg=2,I sif=3,I brion=2,NSW=30,EDIFF=-E-6,EDIFFG=-E-4,Lwave=F。 還望各位大神不吝賜教!感激不盡,感激不盡。 |
木蟲 (正式寫手)
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this error usually indicates that the ionic configuration gives an unreaonable charge density, therefore my first guess is that your ionic relaxation is unphysical. please have a look at your results of steps 1-3: does the total energy decrease? are the predicted geometries and interatomic distances reasonable? (If you insist on volume relaxation: does the external pressure converge?) 1) please consider whether it is reasonable to relax the cell volume and shape of a defective supercell (especially as it only contains 24 atoms!, i e the macroscopic defect concentration would be about 4%!) 2) EDIFF = 1e-4 is definitely not accurate enough if you want to optimize the structure based on the force tensors, this requires better electronic convergence (at least 1e-6) 3) POTIM may be too large, your first relaxation step might have lead to an unresonable 2nd cell configuration 引自http://cms.mpi.univie.ac.at/vasp-forum/forum_viewtopic.php?3.4205 |

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