<p dir="ltr">Dear Ghadiyali Mohammed Kader,</p>
<p dir="ltr">alat is what you have defined as either the parameter A or the parameter celldm(1) under the &system namelist. celldm(1) is in bohr and A is in angstrom.</p>
<p dir="ltr">If you have celldm(1):</p>
<p dir="ltr">multiply the entries in CELL_PARAMETERS by celldm(1)<br>
remove the parameter celldm(1) from the &system namelist<br>
And do CELL_PARAMETERS {bohr}</p>
<p dir="ltr">If you have A:</p>
<p dir="ltr">multiply the entries in CELL_PARAMETERS by A*1.889725989<br>
remove the parameter A from the &system namelist<br>
And do CELL_PARAMETERS {bohr}</p>
<p dir="ltr">If you have neither celldm(1) or A in your &system namelist then the units for CELL_PARAMETERS are assumed to be in bohr so then you just do:<br>
CELL_PARAMETERS {bohr}</p>
<p dir="ltr">Andrew Supka<br>
PhD Student - Science of Advanced Materials<br>
Central Michigan University</p>
<div class="gmail_extra"><br><div class="gmail_quote">On Sep 3, 2016 3:59 AM, "Mohammed Ghadiyali" <<a href="mailto:m786g@live.co.uk" target="_blank">m786g@live.co.uk</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div dir="ltr">Dear All,<div><br></div><div><br></div><div>It would be very helpful if someone can inform me as how to convert or define a crystal structure in the combination of ibrav = 0 <span style="font-size:12pt">and CELL_PARAMETERS in bhor rather than the normally used </span>combination<span style="font-size:12pt"> of ibrav = 0 and CELL_PARAMETERS in alat.</span></div><div><br></div><div><br></div><div>As I what to use phononpy for the calculation of the phonon dispersion as it is observed it is simpler and less expensive (computational) to use.</div><div><br></div><div><br></div><div>Regards,</div><div><br></div><div><span style="font-size:12pt">Ghadiyali Mohammed Kader</span></div> </div></div>
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