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375642546

木虫 (正式写手)

[求助] 求助CASTEP计算ternary半导体出错的原因

拟用MS的CASTEP对CuInS2半导体进行结构优化以及能带结构的简单计算。

首先贴出MatStudio_Log.htm的出错提示:
Error on Job Complete. Failed to import document from G:\MS_Work\CuInS2_ZnS Files\Documents\CuInS2\CuInS2 CASTEP GeomOpt (2)\CuInS2.xsd. - binary file with castep results not present.

接下来是.castep文件的出错提示:
Checkpoint file cannot be written.
Error calculate_finite_basis : Convergence failed when doing finite basis set correction.
Current trace stack:
calculate_finite_basis_corr
check_elec_ground_state
castep
OMP: Warning #2: Cannot open message catalog "2052\libiomp5ui.dll":
OMP: System error #126: 找不到指定的模块。
OMP: Info #3: Default messages will be used.
application called MPI_Abort(MPI_COMM_WORLD, 1) - pr
————————————————————————————————————
在此之前,我测试过AlAs以及ZnS的单胞的结构优化以及能带结构的计算,都没有问题。我不知道是我的MS的Program Files有问题呢?还是我对体系的设置有问题。看错误提示,我实在是不明白问题出在哪里了。请虫友们不吝赐教!
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375642546

木虫 (正式写手)

★ ★
franch: 金币+2, 鼓励交流,, 2013-09-09 22:04:45
一怒之下,将SCF迭代次数增加到800,依然报错。
从第291次SCF开始出现warning
——————————————————————————————————————————————————
Warning: There are no empty bands for at least one kpoint and spin; this may
          slow the convergence and/or lead to an inaccurate groundstate.
          If this warning persists, you should consider increasing nextra_bands
          and/or reducing smearing_width in the param file.
          Recommend using nextra_bands of 19 to 33.   
——————————————————————————————————————————————————
而且这个warning确实是一直persists到第800次,abort拉倒,不知道该怎么增加nextra_bands......
4楼2013-09-09 10:12:10
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375642546

木虫 (正式写手)

考虑到出错提示中有“Convergence failed”这样的字眼……
我试图先降低精度:K点取样,只取gamma点;Energy cutoff取Medium(351.0 eV);不优化晶胞。
结果还是报错:
——————————————————————————————————————————————————
*Warning* max. SCF cycles performed but system has not reached the groundstate.
  
Current total energy, E     =  -7091.852269462     eV
Current free energy (E-TS)  =  -7091.852355686     eV
(energies not corrected for finite basis set)

NB est. 0K energy (E-0.5TS)      =  -7091.852312574     eV

  ****************************************************************************
  Warning: electronic minimisation did not converge when finding ground state.
  ****************************************************************************
  Writing checkpoint file...

Writing model to CuInS2.check
Error check_elec_ground_state : electronic_minimisation of initial cell failed.
Current trace stack:
check_elec_ground_state
castep
application called MPI_Abort(MPI_COMM_WORLD, 1) - process 0
——————————————————————————————————————————————————
暂时不想增加scf迭代次数,第一次的错误提示为“Convergence failed when doing finite basis set correction”,还是先去读下help下的basis tab部分,不知道能不能找到答案!
2楼2013-09-06 15:01:37
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375642546

木虫 (正式写手)

转载:
* Error check_elec_ground_state : electronic_minimisation of initial cell failed.
* Error calculate_finite_basis : Convergence failed when doing finite basis set correction.
* Error in /subroutine/ - electronic_minimisation of current_cell failed.
Any of these messages means that the SCF convergence loop did not converge in the maximum allowed number of iterations. If you read the end of the .castep file it ought to be obvious whether the run only just failed to converge. In that case specifying a larger value of MAX_SCF_CYCLES in the .parm file ought to work. But sometimes it is apparent that the energy is unlikely ever to converge, for example it may oscillate, or be decreasing linearly and slowly. This may indicate that the system is in a poorly-bonded or co-ordinated state, and it's best to ask advice if you don't know how to preceed.
3楼2013-09-06 17:47:23
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375642546

木虫 (正式写手)

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franch: 金币+2, 鼓励交流,, 2013-09-09 22:04:55
将empty band设到了30%,warning消失了,但依然abort。
5楼2013-09-09 10:55:38
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