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liliangfang: ½ð±Ò+3, лл½»Á÷ 2013-09-15 09:06:06
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liliangfang: ½ð±Ò+3, лл½»Á÷ 2013-09-15 09:06:06
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this error usually indicates that the ionic configuration gives an unreaonable charge density, therefore my first guess is that your ionic relaxation is unphysical. please have a look at your results of steps 1-3: does the total energy decrease? are the predicted geometries and interatomic distances reasonable? (If you insist on volume relaxation: does the external pressure converge?) 1) please consider whether it is reasonable to relax the cell volume and shape of a defective supercell (especially as it only contains 24 atoms!, i e the macroscopic defect concentration would be about 4%!) 2) EDIFF = 1e-4 is definitely not accurate enough if you want to optimize the structure based on the force tensors, this requires better electronic convergence (at least 1e-6) 3) POTIM may be too large, your first relaxation step might have lead to an unresonable 2nd cell configuration Òý×Ôhttp://cms.mpi.univie.ac.at/vasp-forum/forum_viewtopic.php?3.4205 |

2Â¥2013-09-14 17:01:36














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