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1051358187

金虫 (小有名气)

[求助] VASP计算能量不相等的问题

FREE ENERGIE OF THE ION-ELECTRON SYSTEM (eV)
  ---------------------------------------------------
  free  energy   TOTEN  =      -306.82473030 eV

  energy  without entropy=     -306.82473030  energy(sigma->0) =     -306.82473030

d Force = 0.6058036E-04[ 0.309E-04, 0.903E-04]  d Energy = 0.1035490E-03-0.430E-04
d Force =-0.1332954E+00[-0.133E+00,-0.133E+00]  d Ewald  = 0.4306897E+00-0.564E+00

做初步优化,最后reached required accuracy - stopping structural energy minimisation,没有设置温度什么参数,所以上面的free  energy   TOTEN  =  

  energy  without entropy=      energy(sigma->0) =     -306.82473030
但是同样的输入文件我就替换了一个过渡金属
也出现reached required accuracy - stopping structural energy minimisation,但是结果却是这样
FREE ENERGIE OF THE ION-ELECTRON SYSTEM (eV)
  ---------------------------------------------------
  free  energy   TOTEN  =      -288.78125169 eV

  energy  without entropy=     -288.55900164  energy(sigma->0) =     -288.67012667

d Force = 0.3750536E-04[ 0.284E-04, 0.466E-04]  d Energy = 0.4720456E-04-0.970E-05
d Force = 0.8242712E-02[ 0.818E-02, 0.830E-02]  d Ewald  =-0.3965413E+00 0.405E+00
就是他们都不相等了,这说明什么呢,这个新的结构很不稳定吗,谢谢
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