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If cell optimization fails with the following message in the output file:

"BFGS: Geometry optimization failed to converge after ... steps",

You should try one of the following:

change electronic minimization algorithm to All Bands/EDFT scheme
use a stricter SCF tolerance
use a less strict Max. stress tolerance

ÇëÎÊAll Bands/EDFT µÄ¼ÆËãËٶȱÈBFGSÂýÂð£¿
Max. stress ÉèµÃ´óÁ˶ÔÓÅ»¯µÄ½á¹ûÓÐʲôӰÏ죬ÐèÒªÔڽϴóµÄMax. stress ÏÈÓÅ»¯È»ºóÔÚµ÷µÍMax. stress ÔÙ½Ó×ÅÓÅ»¯Âð£¬Max. stress ¿É½ÓÊܵÄÖµµÄÉÏÏÞÊǶàÉÙ£¬Ò²¾ÍÊÇÓÅ»¯³öÀ´µÄ½á¹û¿ÉÒÔ±»ÈϿɵÄÖµ¡£Ð»Ð»£¡
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¸öÈ˾õµÃ¾¡Á¿²»ÒªËæÒâ¸Ä±äMax. stress ´óС£¬¿ÉÒÔÊÔÊÔuse a stricter SCF tolerance
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