Hi,<br><br> Here are the input and output files.<br><br> b19_Acklatpos_new.* - original structure<br><br> b19_pwscf.* - scf calculation with a structure obtained after vc-relax<br><br> Please have a look if they are of help.<br>
<br>regards,<br>Karthik<br><br><div class="gmail_quote">On Sat, Aug 14, 2010 at 6:27 AM, Paolo Giannozzi <span dir="ltr"><<a href="mailto:giannozz@democritos.it">giannozz@democritos.it</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div class="im"><br>
On Aug 4, 2010, at 4:41 , Guda Karthik wrote:<br>
<br>
> I am trying to relax an orthorhombic structure using vc-relax<br>
> (celldofree - xyz). I start with a structure which is at a Pressure<br>
> of -20.5 Kbar and at the end of the vc-relax I get a structure<br>
> which is at a pressure of -0.21 Kbar. Surprisingly, the structure<br>
> at pressure closer to zero is higher in energy than the original<br>
> structure by 8 * 10^-4 eV/formula unit. All the symmetry elements<br>
> have been conserved during relaxation and the initial and final<br>
> structures are the same. I am not able to make sense of this<br>
> result. I observe this inconsistency in my B2 structure as well.<br>
> Please help regarding this.<br>
<br>
</div>hard to help without input and output<br>
<br>
P.<br>
---<br>
Paolo Giannozzi, Dept of Physics, University of Udine<br>
via delle Scienze 208, 33100 Udine, Italy<br>
Phone +39-0432-558216, fax +39-0432-558222<br>
<br>
<br>
<br>
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</blockquote></div><br><br clear="all"><br>-- <br>Karthik Guda<br>Graduate Student<br>Materials Engineering<br>Purdue University<br><br>