<div dir="ltr"><div class="gmail_default" style="font-size:large">Dear Prof. Peter,</div><div class="gmail_default" style="font-size:large">Thank you very much for taking my query into consideration.</div><div class="gmail_default" style="font-size:large">Your reply gives me some understanding and now I should read the paper you mentioned and some other related appropriate literature.</div><div class="gmail_default" style="font-size:large"><br></div><div class="gmail_default" style="font-size:large">Thank you very much.</div><div class="gmail_default" style="font-size:large"><br></div><div class="gmail_default" style="font-size:large">Regards</div><div class="gmail_default" style="font-size:large">Bhamu</div><div class="gmail_default" style="font-size:large"><br></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Apr 18, 2020 at 9:12 PM Peter Blaha <<a href="mailto:pblaha@theochem.tuwien.ac.at">pblaha@theochem.tuwien.ac.at</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">If you are lucky, yes, but in general, the answer is NO !!!<br>
<br>
The lattice parameter is only a "mean value", and is a "prerequisite" <br>
for a finit temp calculation.<br>
<br>
But think about: what means "Termperature" ?<br>
<br>
It vibrations, which are excited more or less with T. The atoms move <br>
around heavily and this can be even anisotropic.<br>
And one measures basically an average of a certain quantity while the <br>
atoms are vibrating around.<br>
<br>
Calculating phonons gives you entropy and free energies;<br>
Doing properties with temperature dependent average displacements gives <br>
you properties at finite T.<br>
<br>
One example: Physical Review B, 98 (2018), S. 235205.<br>
<br>
<br>
Am 18.04.2020 um 15:33 schrieb Dr. K. C. Bhamu:<br>
> Dear Experts,<br>
> <br>
> Could you please confirm that if I have temperature dependent lattice <br>
> parameters, from DFT calculation, then whatever properties like band, <br>
> phonon, elastic, ... , I compute will be considered as temperature <br>
> dependent ?<br>
> Yes, ionic positions should be relaxed what I know.<br>
> My own answer would be yes for this query but I need a confirmation.<br>
> <br>
> It would be a help from computational resources point of view. I do not <br>
> want to test the calculation and see the the difference as system is <br>
> more computational time demanding.<br>
> <br>
> Thank you very much.<br>
> <br>
> Regards<br>
> Bhamu<br>
> <br>
> <br>
> <br>
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