<p dir="ltr">Did you check the absolute cell size for the two - minimize the energy w.r.t. size?</p>
<p dir="ltr">---<br>
Professor Laurence Marks<br>
Department of Materials Science and Engineering<br>
Northwestern University<br>
<a href="http://www.numis.northwestern.edu">http://www.numis.northwestern.edu</a><br>
Corrosion in 4D <a href="http://MURI4D.numis.northwestern.edu">http://MURI4D.numis.northwestern.edu</a><br>
Co-Editor, Acta Cryst A<br>
"Research is to see what everybody else has seen, and to think what nobody else has thought"<br>
Albert Szent-Gyorgi</p>
<div class="gmail_quote">On Jan 29, 2016 04:38, "Pavel Ondračka" <<a href="mailto:pavel.ondracka@email.cz">pavel.ondracka@email.cz</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Laurence Marks píše v Pá 29. 01. 2016 v 04:22 -0600:<br>
> Did you check for lattice parameter changes? A relatively small<br>
> change for a single unit cell can translate to something larger.<br>
> Unfortunately you need a reference compound, which is not so simple<br>
> in your case. Perhaps test SiO2, TiO2 & a few simple similar<br>
> compounds with the PAW & Wien2k.<br>
<br>
Yeah, some difference in cell size or positions was one of my suspects.<br>
I usually use VESTA to read the structure file from PAW software, then<br>
output to cif and use cif2struct to convert to struct and I was<br>
suspecting that maybe somewhere in this process I lose precision. <br>
So I've actually written a small python script to convert it directly<br>
with full precision allowed by the struct format, however the result<br>
were almost identical.<br>
Regarding the test cases, we tested eg. with rutile (with one atom<br>
slightly displaced to induce some forces) and the result were<br>
comparable (few percent difference).<br>
<br>
Best regards<br>
Pavel Ondračka<br>
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