<div dir="auto">Dear Prof. Blaha, <div dir="auto"><br></div><div dir="auto"> Thank you very much! </div><div dir="auto"> Luis </div></div><div class="gmail_extra"><br><div class="gmail_quote">Em 26/01/2018 13:25, "Peter Blaha" <<a href="mailto:pblaha@theochem.tuwien.ac.at">pblaha@theochem.tuwien.ac.at</a>> escreveu:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Yes, of course for phonon calculations you have first to optimize the structure. And for that, TOLF should be reduced, because for phonons you should start with a structure which has "zero" (typically 0.1 to 0.01) forces.<br>
tolf tells the code when to stop moving atoms.<br>
-fc xx tells the code to stop the scf when forces are converged to xx mRy.<br>
<br>
<br>
On 01/26/2018 02:30 PM, Luis Ogando wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Dear Wien2k community,<br>
<br>
I would like to calculate phonon dispersion in a wurtzite system. What convergence values (-ec , -cc and -fc) do you suggest to perform the structure optimization before the forces calculation in the distorted cells ? And for these forces calculation ?<br>
<br>
Just a curiosity, when optimizing internal parameters with MSR1a, does "tolf" (case.inM) have any effect ?<br>
All the best,<br>
Luis<br>
<br>
<br>
<br>
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Peter BLAHA, Inst.f. Materials Chemistry, TU Vienna, A-1060 Vienna<br>
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