Hi all,<div>when I optimized a C3N4 structure with xy and  xyz periodic, the resulting structure collapses and becomes chaotic，can not get a reasonable result. But the results optimized with Vasp seemed reasonable, did not appear similar problem. How could I improve  that ?</div><div><br></div><div>Best </div><div>Chong<img alt="cp2k.png" data-iml="1812397.5" width="534px" height="274px" src="cid:c6aa39c6-79e9-4037-bc8d-3b1feff50106"><img alt="vasp.png" data-iml="1819814.1000000238" width="534px" height="499px" src="cid:b7a6a1fb-aff1-46bd-8a3f-6666ef592a98"></div>

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