<div dir="ltr"><span style="font-size:14px">Giuseppe,</span><br><div><span style="font-size:14px"><br></span></div><div><span style="font-size:14px">Anatase is body-centred tetragonal, and not primitive tetragonal. So it deserves ibrav=7. Mind you, that any body-centred tetragonal can be expressed as primitive tetragonal by doubling the number of atoms, but this is </span>redundant. </div><div><br></div><div>Any other thoughts on USPP + Hybrid XC?</div><div><br></div><div><span style="font-size:14px"><br></span></div><div><span style="font-size:14px"><br></span></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Feb 22, 2015 at 3:58 PM, Giuseppe Mattioli <span dir="ltr"><<a href="mailto:giuseppe.mattioli@ism.cnr.it" target="_blank">giuseppe.mattioli@ism.cnr.it</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear Amin Torabi<br>
There are twelve atoms in the TiO2 anatase unit cell, which is<br>
tetragonal (ibrav=6). You should have something like this in your input:<br>
<br>
&system<br>
ibrav=6, celldm(1)=7.14695, celldm(3)=2.51243,<br>
nat= 12, ntyp= 2,<br>
/<br>
<br>
ATOMIC_POSITIONS {crystal}<br>
Ti 0.000000000 0.000000000 0.000003623<br>
Ti 0.000000000 0.500000000 0.249986945<br>
Ti 0.500000000 0.500000000 0.500003954<br>
Ti 0.500000000 0.000000000 0.750020715<br>
O 0.000000000 0.000000000 0.209045627<br>
O 0.000000000 0.000000000 -0.209037598<br>
O 0.000000000 0.500000000 0.458997835<br>
O 0.000000000 0.500000000 0.040931128<br>
O 0.500000000 0.500000000 0.709041098<br>
O 0.500000000 0.500000000 0.290968227<br>
O 0.500000000 0.000000000 0.959077715<br>
O 0.500000000 0.000000000 0.541010967<br>
K_POINTS {automatic}<br>
4, 4, 2, 0, 0, 0<br>
<br>
Nevertheless, the EXX inplementation with US pseudopotential is still<br>
far from optimally implemented, and it may fail and/or employ much<br>
more time than the conventional NC implementation.<br>
HTH<br>
Giuseppe<br>
<br>
Giuseppe Mattioli<br>
ISM-CNR<br>
Italy<br>
<div><div class="h5"><br>
Quoting Amin Torabi <<a href="mailto:mtorabi@uwo.ca">mtorabi@uwo.ca</a>>:<br>
<br>
> Sorry, I meant TiO2 (anatase)<br>
><br>
> I tried to test it on TiO2 (WZ)<br>
>><br>
>><br>
><br>
> --<br>
> **********************************<br>
> Amin Torabi<br>
> Ph.D. Candidate<br>
> Department of Chemistry<br>
> University of Western Ontario<br>
> **********************************<br>
<br>
<br>
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