<div>Well-beloved Stefaan Cottenier,</div>
<div> Thank you very much for your reply. Are there general rules on the substitution of original atoms of supercell? Thank you.</div>
<div> Best regards.</div>
<div> Sincerely yours,</div>
<div> Fei Tun <br><br> </div>
<div><span class="gmail_quote">2006/9/26, Stefaan Cottenier <<a href="mailto:Stefaan.Cottenier@fys.kuleuven.be">Stefaan.Cottenier@fys.kuleuven.be</a>>:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><br>> Thank you very much for your valuable and informative advice.<br>> Taking the 2*2*2 supercell of TiC as the example, would you like to
<br>> give me some advice on how to substitute the original atoms of<br>> supercell according to the two different instances:(1)impurities that<br>> are closely packed into clusters, (2)impurities that are as<br>
> homogeneously disitributed over the supercell as possible?<br><br>Do various substitutions and visualize the cells by Xcrysden: you will<br>*see* how the distribution of your impurities is.<br><br>> Besides, how about the substitution of original atoms when there
<br>> are more than one type original atom (for example the Si atom in<br>> FeSi2) in the supercell?<br><br>It all depends on the physics of your problem. Some impurities might<br>'like' one of the sites over the other, other impurities don't.
<br>Calculate the total energies and compare ?<br><br>Stefaan<br><br><br>Disclaimer: <a href="http://www.kuleuven.be/cwis/email_disclaimer.htm">http://www.kuleuven.be/cwis/email_disclaimer.htm</a><br><br>_______________________________________________
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</a><br></blockquote></div><br><br clear="all"><br>-- <br>Scoool of Materials Science and Engineering<br>Central South University<br>Jian Zhu