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guodonglin

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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
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enola

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uuv2010(½ð±Ò+1): ¶àлÌáʾ 2012-02-18 21:11:00
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timeflies..
2Â¥2012-02-18 18:04:37
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enola

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WDD880227(½ð±Ò+1): ¸ÐлÌáʾ 2012-02-18 19:42:32
uuv2010(½ð±Ò+1): ¶àлÌáʾ 2012-02-18 21:11:06
¶øÇÒÄãÉèÖÃPREC=Accurate
timeflies..
3Â¥2012-02-18 18:04:59
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guodonglin

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Â¥: Originally posted by enola at 2012-02-18 18:04:37:
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4Â¥2012-02-18 19:01:41
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jghe

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WDD880227(½ð±Ò+1): ¸ÐлÌáʾ 2012-02-18 19:42:47
guodonglin(½ð±Ò+4): ¡ïÓаïÖú 2012-02-18 19:50:03
uuv2010: »ØÌûÖö¥ 2012-02-18 21:11:10
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.
5Â¥2012-02-18 19:18:42
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WDD880227

ľ³æ (ÕýʽдÊÖ)

uuv2010(½ð±Ò+2): ¶àлÌáʾ 2012-02-18 21:10:50
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smiling&fighting...
6Â¥2012-02-18 19:44:33
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