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wenbao2003

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[求助] CASTEP算能量出错

*Warning* max. SCF cycles performed but system has not reached the groundstate.
  
Current total energy, E     =  -3470.539604785     eV
Current free energy (E-TS)  =  -3470.795901720     eV
(energies not corrected for finite basis set)

NB est. 0K energy (E-0.5TS) =  -3470.667753253     eV

  ****************************************************************************
  Warning: electronic minimisation did not converge when finding ground state.
请教上面情况
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jeeanlee

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fzx2008(金币+3): 谢谢指教 2011-11-01 21:39:09
是CASTEP结果中的出错报警信息,该信息的含义如下:

*Warning* max. SCF cycles performed but system has not reached the groundstate.
   已完成最大SCF循环,但体系仍未到达基态。
Current total energy, E     =  -3470.539604785     eV
Current free energy (E-TS)  =  -3470.795901720     eV
(energies not corrected for finite basis set)

NB est. 0K energy (E-0.5TS) =  -3470.667753253     eV
上述三者分别为完成最大SCF循环后(即当前)能量值。
   ****************************************************************************
   Warning: electronic minimisation did not converge when finding ground state.
在搜寻基态过程中电子最小化并未达到收敛
2楼2011-11-01 21:17:01
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jeeanlee

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wenbao2003(金币+1): 2011-11-02 09:31:40
补充一下,如果SCF循环可见能量单调降低,则可以调大MAX SCF循环数值再重新计算。如果SCF循环中能量反复振荡,则需要考虑计算参数的设置(尤其是Ecutoff、kpoint和收敛标准)是否合理。
3楼2011-11-01 21:19:45
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wenbao2003

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4楼2011-11-02 09:28:41
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