<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1453560647935_3848">I did vc-relax calculations for silicon and at the end of the calculation i got my final lattice parameter and atomic positions, but to my surprise when i viewed my new structure with my new atomic positions, it does not look like a face centered crystal structure but preparing the input file with the old atomic position its look perfecting like the face centered crystal structure with atom on all of the faces </div><div id="yui_3_16_0_1_1453560647935_3848"><br></div><div id="yui_3_16_0_1_1453560647935_3848" dir="ltr">Does this mean that the new atomic positions should not be used for calculation after vc-relax because the old atomic position looks better when viewed with xcrysden </div><div id="yui_3_16_0_1_1453560647935_3848" dir="ltr"><br></div><div id="yui_3_16_0_1_1453560647935_3848" dir="ltr"><br></div><div id="yui_3_16_0_1_1453560647935_3848" dir="ltr">Agbaoye Ridwan Olamide</div><div id="yui_3_16_0_1_1453560647935_3848" dir="ltr">Federal University of Agriculture, Abeokuta</div><div id="yui_3_16_0_1_1453560647935_3848" dir="ltr">M.Sc. in view</div></div></body></html>