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傻孩阿布

铁虫 (初入文坛)

[求助] vasp计算出错,求指教

vasp计算fe体系,超胞,54原子,计算到最后,显示error fexcf:supplied exchange-correlation table is too small,maximal index:50334.请问这个是什么问题呢?同时上面的zbrent:accuracy dongt reached。
不知道是不是我的incar文件写的有问题,因此把incar也文件也贴出来,还请大神指教:
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。
还望各位大神不吝赐教!感激不尽,感激不尽。
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tonglijia

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【答案】应助回帖

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感谢参与,应助指数 +1
liliangfang: 金币+3, 谢谢交流 2013-09-15 09:06:06
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
人,要靠自己!!!
2楼2013-09-14 17:01:36
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