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[求助]
CINEB過渡態(tài)不收斂
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NEW=2000,現(xiàn)在算了5天了,算到1350多步了,還沒有收斂。做的是甲醇分子在銳鈦礦晶面上脫去一個H原子。始態(tài)和終態(tài)都是優(yōu)化好的結(jié)構(gòu)。先把INCAR貼出來,請大俠們幫忙看看。萬分感謝 Start parameter for this run LPLANE = .TRUE. ISTART = 0 ICHARG= 2 NEB tag LCLIMB = .TRUE. ICHAIN = 0 IMAGES = 4 SPRING = -5 EFIRST = -679.747953 ev ELAST = -679.966761 ev MAXMOVE = 0.2 TIMESTEP = 0.1 NSIM = 4 Electronic Relaxation ENCUT = 400 ev PREC = Normal ISIF = 2 EDIFF = 1E-4 EDIFFG = -0.01 NELMIN= 6 LREAL= Auto ALGO = Fast DOS related values ISMEAR = 0 SIGMA = 0.1 NEDOS = 300 ISPIN = 2 Ionic Relaxtion ISMEAR = 0 NSW = 2000 IBRION = 3 POTIM = 0.0 IOPT = 7 NBLOCK = 1 Write flag LWAVE = .FALSE. LCHARG = .FALSE. LVTOT = .FALSE. LORBIT = .FALSE. |
金蟲 (小有名氣)
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樓主可以試試IOPT=2,用CG方法優(yōu)化給出勢能面的曲率應(yīng)該會好些,IOPT=7是基于quick-min的,這個方法對于不精確的力還好些,就是說粗略找到過渡態(tài)還是可以的,但是對于樓主這個-0.01的力這個方法就不那么適用了。For high forces (far from the minimum) or inaccurate forces (close to the minimum) the quick-min or FIRE methods are recommended. These two methods do not rely on curvatures, and tend to be less aggressive, better behaved, but also less efficient than CG/LBFGS. 這是網(wǎng)站上那個說明,希望對你有幫助。 |
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