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egg19900805

新虫 (小有名气)

[求助] 固定C軸 鬆弛A B軸 的方法

????PAW???????BiFeO3 ????relax??(ISIF=3)
?l?F?w?e(115.5)?????(126)????s9%

?????vasp?????23???}?s??r
???f???{????????????????????λ??
????????????C?S ????A B?S ????w?e??????

???????POSCAR??
Fe2 Bi2 O6                              
   1.00000000000000     
     4.7056534361214437   -0.0473600491087546    2.7444919032575892      (a?S)
     1.5539706021362183    4.4419135148306212    2.7444919082264456      (b?S)
    -0.0674598255581248   -0.0473599951737402    5.4470968385121745
a??b?S ??e????0.98~1.05????s?w?e

INCAR????
SYSTEM=BiFeO3_R3C  (Fe Bi O)
ISTART = 0 ; ICHARG = 2
ISPIN = 2                               # spinpolarized calculations
ENCUT = 450
PREC = Accurate
ISMEAR = -5 ; SIGMA = 0.2
#EDIFF = 1E-5
#EDIFFG = -1E-3
NPAR = 1
MAGMOM = 6 -6 0 0 0 0 0 0 0 0
NSW = 60                        
IBRION = 2
ISIF = 2
LDAU = .TRUE.             #Switches on the L(S)DA+U
LDAUTYPE = 2             #Dudarev??s approach to LSDA+U
LDAUL = 2 -1 -1
LDAUU = 0 0 0
LDAUJ = 0 0 0
#RWIGS = 1.164 1.635 0.82


???????????????s????????relax????????
?????????
????????????????????e???
???x

?X?.PNG
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egg19900805

新虫 (小有名气)

???????:
2?: Originally posted by ApolloYang at 2013-05-13 18:39:49
1. ???????????????????????????
   ???? ??LDA????Щ  ??GGAò?????
  DFT????????T??0K?? ????????????T=0K??

2. ????????????б?????????  ?б????U ??

?x?x???!!????c????????? ??????????

????????????e???? ???????????_?????????????????????λ??

?x?x?????@@
3楼2013-05-13 20:11:00
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ApolloYang

木虫 (正式写手)

【答案】应助回帖

★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
感谢参与,应助指数 +1
franch: 金币+2, 谢谢回帖交流,, 2013-05-13 21:08:45
egg19900805: 金币+10, ★★★很有帮助 2013-06-20 15:53:23
1. 优化后的晶格常数往往不等于实验值。
   一半的 用LDA会低一些  用GGA貌似会高点。
  DFT计算对应于T=0K, 而实验室不可能T=0K。

2. 晶格常数优化,有必要算磁性嘛,  有必要加U ?
2楼2013-05-13 18:39:49
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