Dear Chong<div><br></div><div>From the instructions in the input that you provided the coordinates are replicated in XY, but the Poisson solver is not periodic.</div><div>Moreover the CELL dimensions do not replicate correctly the coordinates. </div><div><br></div><div>Regards</div><div>Marcella</div><div><br></div><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Monday, May 2, 2022 at 10:30:56 AM UTC+2 wang52...@gmail.com wrote:<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">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" width="534px" height="274px" src="https://groups.google.com/group/cp2k/attach/29b8f878aaba8/cp2k.png?part=0.5&view=1"><img alt="vasp.png" width="534px" height="499px" src="https://groups.google.com/group/cp2k/attach/29b8f878aaba8/vasp.png?part=0.4&view=1"></div></blockquote></div>
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