<div dir="ltr"><div>Dear Dr. Marks, <br></div><div>(a). which functionals you recommend. <br></div><div>(b).And how should i model it. <br></div><div>But same method reported for Ta -doped Hafnia. EFG matches very well with experimentally determined value. Even the assysmetry parameter matched to accuracy of ~17% (assymetry parameter seems to be sensitive to structure relaxation). Please see <a href="https://journals.aps.org/prb/abstract/10.1103/PhysRevB.78.165206">https://journals.aps.org/prb/abstract/10.1103/PhysRevB.78.165206</a> (Table IV), <br></div><div><br></div><div>thanking you,</div><div>A. kumar<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jun 9, 2020 at 1:35 AM Laurence Marks <<a href="mailto:laurence.marks@gmail.com">laurence.marks@gmail.com</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"><div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)"><br></div></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><br></div><div></div><div>###Ta substitution for Ti in STO is a n-type semiconductor. Think it through.###</div><div>Yes sir. But i do not dope Ta directly. It's by way of nuclear transmutation, Ta forms at site of Ti. Hafnium-181 (radioactive and a TDPAC probe) is doped in STO. Hf-181 (stable OS: +4) decays into Ta-181 (stable OS: +5). <br></div></div></blockquote><div><span class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">Ta at a Ti site is a dopant.</span> <span class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)"> There are only two reasonable approximations:</span></div><div><span class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">a) Ta "as is" (neutral cell), where the extra Ta n-type state may be localized or delocalized. Vanilla PBE may get this wrong. This models high Ta doping levels.</span></div><div><span class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">b) A +ve charged cell (remove one electron) to model the n-type state being "elsewhere", i.e. a dilute limit.</span></div><div><span class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)"><br></span></div><div><span class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">Adding an electron makes little sense IMHO.</span></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div></div><div><br></div><div></div><div>I will try to repeat calculation with 6.5.</div><div><br></div><div>Just one more thing, very recently i noticed that space group is not mentioned in case.struct file after structure relaxation (case.struct file already attached in previous mail). Do " x sgroup" need to run after structrue relaxation also. <br></div></div></blockquote><div><span class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,0,0)">No</span> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div></div><div><br></div></div></blockquote></div>-- <br><div dir="ltr"><div dir="ltr">Professor Laurence Marks<br>Department of Materials Science and Engineering<br>Northwestern University<br><a href="http://www.numis.northwestern.edu/" target="_blank">www.numis.northwestern.edu</a><div>Corrosion in 4D: <a href="http://www.numis.northwestern.edu/MURI" target="_blank">www.numis.northwestern.edu/MURI</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</div></div></div></div>
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