<div dir="ltr">I think you should get a good <span style="font-size:12.800000190734863px">inter-layer distance by using DFT-D3 (</span>CP2K version 2.6.2).</div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Apr 1, 2017 at 6:21 AM, Chenxing Yang <span dir="ltr"><<a href="mailto:chenx...@gmail.com" target="_blank">chenx...@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Dear All,</div><div><br></div><div>I have run some simulations of geometry optimization for graphite with OPT-PBE using CP2K 4.1, and I have some problem on reproducing the correct crystalline structure of graphite.</div><div><br></div><div>For some reason, the bond length is slightly overestimated (1.448 Å), and inter-layer distance is underestimated (2.756 Å), where experiment results are 1.421 Å and 3.33 Å. It seems those 2 distances can be very well reproduced using OPT-PBE in the literature. Could you please help me to check if something is wrong in the input file?</div><div><br></div><div>Another problem I encountered is, if I simulate in a 3*3*3 supercell, the atoms is located same position of atoms in the adjacent layer, instead of centre of hexagon, but it is fine if the supercell is set as 2*2*2 and 4*4*4. </div><div><br></div><div>Here is my input file attached. Thank you very much!</div><div><br></div><div>Kind regards,</div><div><br></div><div>Chenxing Yang</div></div><span class="HOEnZb"><font color="#888888">
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