<p dir="ltr">Yes, and no.</p>
<p dir="ltr">You should think about what you really have. </p>
<p dir="ltr">Do you have a compound where the lattice parameter is set by 10^N atoms of bulk not the dopant. In this case it is incorrect to change the lattice parameter, but you need a large enough supercell to adequately model the local relaxations (strain fields).</p>
<p dir="ltr">Alternatively, do you have a true alloy where the overall dopant concentration is high enough that the lattice parameter changes? In that case you do have to optimize the volume of the alloy.</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 Sep 15, 2015 02:57, "Khoirom Kabita" <<a href="mailto:kabitakabita01@gmail.com">kabitakabita01@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear Sir,<br>
<br>
I generally perform volume optimization during calculation of<br>
materials. Does the same apply for doped materials also.<br>
<br>
yours faithfully,<br>
kabita<br>
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