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小酒馆007

银虫 (初入文坛)

[求助] VASP优化FCC晶胞,优化完之后a轴长度没变,只有b和c发生了变化

各位大神好,小弟最近在学习VASP,在优化FCC晶胞时,优化完之后得到的结果a轴长度没变,只有b和c发生了变化。有没有哪位碰到过这种情况:以下为INCAR  POSCAR 和 CONTCAR文件:
SYSTEM = Cu
ENCUT = 600
PREC = ACCURATE
EDIFF  = 5E-6
EDIFFG = -0.01
ISYM = 1
LREAL = .FALSE.
ISTART = 0
ICHARG = 2
INIWAV = 1
ISMEAR = 2
SIGMA = 0.1
IBRION = 2
ISIF = 3
NSW = 200
POTIM = 0.5
NELMIN = 4
NELM = 200
NELMDL = -5
ALGO = F
LWAVE = .FALSE.
LCHARG = .FALSE.


Cu
1.0
        3.6147000790         0.0000000000         0.0000000000
        0.0000000000         3.6147000790         0.0000000000
        0.0000000000         0.0000000000         3.6147000790
   Cu
    4
Direct
     0.000000000         0.000000000         0.000000000
     0.000000000         0.500000000         0.500000000
     0.500000000         0.000000000         0.500000000
     0.500000000         0.500000000         0.000000000


Cu                                      
   1.00000000000000     
     3.6147000789999999    0.0000000000000000    0.0000000000000000
     0.0000000000000000    3.6561394397881988    0.0000000000000000
     0.0000000000000000    0.0000000000000000    3.6561394397881988
   Cu
     4
Direct
  0.0000000000000000  0.0000000000000000  0.0000000000000000
  0.0000000000000000  0.5000000000000000  0.5000000000000000
  0.5000000000000000  0.0000000000000000  0.5000000000000000
  0.5000000000000000  0.5000000000000000  0.0000000000000000

  0.00000000E+00  0.00000000E+00  0.00000000E+00
  0.00000000E+00  0.00000000E+00  0.00000000E+00
  0.00000000E+00  0.00000000E+00  0.00000000E+00
  0.00000000E+00  0.00000000E+00  0.00000000E+00
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a75547020

银虫 (小有名气)

首先。。你的面心晶胞基矢错了 vasp的面心晶胞基矢方向应该是原胞的 也就是
?
.5 .5 0
.5 0 .5
0 .5 .5
1
D
0 0 0
新人!
2楼2016-09-19 13:46:22
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