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guodonglin至尊木蟲 (職業(yè)作家)
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[求助]
vasp優(yōu)化難收斂,請大家給我看看
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vasp優(yōu)化難收斂,請大家給我看看。INCAR如下: SYSTEM=LPO ENCUT=500 ISTART=0 ICHARG=2 NELM=80 EDIFF=0.1E-03 NSW=80 EDIFFG=-0.01 IBRION=2 ISIF=3 #RWIGS=1.535 1.233 0.820 1.164 #LORBIT=11 NGX=105;NGY=108;NGZ=50 LREAL=.TRUE. ISMEAR=-5 SIGMA=0.14 GGA=PE ALGO=Normal PREC=Accurate 現(xiàn)在已經(jīng)運行到60多步了,還不收斂,急啊,請大家給我點建議,謝謝大家 [ 來自科研家族 磁性材料 ] |
至尊木蟲 (職業(yè)作家)
捐助貴賓 (正式寫手)

捐助貴賓 (正式寫手)

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Efficient relaxation from an unreasonable starting guess If you want to do an efficient relaxation from a configuration that is not close to the minimum, set the following values in the INCAR file (for briefness the recommended setup is lacking, see Sec. 6.2.3): NELMIN = 5 # do a minimum of four electronic steps EDIFF = 1E-2 # low accuracy EDIFFG = -0.3 # accuracy of ions not too high NSW = 10 # 10 ionic steps in ions IBRION = 2 # use CG algorithm This way only low accuracy will be required in the first few steps, but since a minimum of 5 electronic steps is done the accuracy of the calculated electronic groundstate will gradually improve. If you are a slightly advanced user you can also use the damped MD algorithm, which is usually more efficient than the CG one: IBRION = 1 ; SMASS = 0.4 # damped MD POTIM = 0.4 # time step needs to chosen with care In this case, a too large POTIM will result in divergence. |
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