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nanost木蟲 (知名作家)
Dr.
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[求助]
vasp進(jìn)行結(jié)構(gòu)優(yōu)化,出現(xiàn)提示怎么解決 已有1人參與
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以下是計(jì)算過程中給我的提示,請問如何解決?謝謝 | | ADVICE TO THIS USER RUNNING 'VASP/VAMP' (HEAR YOUR MASTER'S VOICE ...): | | | | Your highest band is occupied at some k-points! Unless you are | | performing a calculation for an insulator or semiconductor, without | | unoccupied bands, you have included TOO FEW BANDS!! Please increase | | the parameter NBANDS in file 'INCAR' to ensure that the highest band | | is unoccupied at all k-points. It is always recommended to | | include a few unoccupied bands to accelerate the convergence of | | molecular dynamics runs (even for insulators or semiconductors). | | Because the presence of unoccupied bands improves wavefunction | | prediction, and helps to suppress 'band-crossings.' 我的incar設(shè)置如下 SYSTEM=AgCoO2 ISTART=0 ICHARG=2 EDIFF=1E-04 NSW=1000 PREC=M ISIF=3 IBRION=2 |

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看樣子是說NBANDS少了,在INCAR里面添加上NBANDS這個參數(shù),具體設(shè)置可以參見vasp手冊,我記得好像是(離子數(shù)與電子書之和)除2,對于過渡金屬好像是離子數(shù)X2+電子數(shù)/2,這個我記不太清楚了,你查查手冊,但是可以肯定一點(diǎn),加上去之后,計(jì)算速度奇慢無比……(我機(jī)器本來也不行) 另外,可否PREC=A? EDIFFG是多少?怎么沒有設(shè)置,這個INCAR應(yīng)該是弛豫的吧 |

木蟲 (知名作家)
Dr.

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