Hi,<br><br>I am trying to relax an orthorhombic structure using vc-relax (celldofree - xyz). I start with a structure which is at a Pressure of -20.5 Kbar and at the end of the vc-relax I get a structure which is at a pressure of -0.21 Kbar. Surprisingly, the structure at pressure closer to zero is higher in energy than the original structure by 8 * 10^-4 eV/formula unit. All the symmetry elements have been conserved during relaxation and the initial and final structures are the same. I am not able to make sense of this result. I observe this inconsistency in my B2 structure as well. Please help regarding this.<br>
<br>regards,<br clear="all"><br>-- <br>Karthik Guda<br>Graduate Student<br>Materials Engineering<br>Purdue University<br><br>