<p dir="ltr">Ti is 4+ (valence), Ni is 2+. Unless you add oxygen vacancies it will always be metallic (degenerate semiconductor). There is nothing wrong!</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 Aug 13, 2015 06:36, "sikander Azam" <<a href="mailto:sikander.physicst@gmail.com">sikander.physicst@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">
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<div dir="ltr">Resp. All
<div>I am doing calculations on TiO2, I made the super cell and doped Ni. I used GGA+U but when the calculations finished this give me the metallic nature, but using the GGA+U on TiO2 I got the almost 3.0 eV band.</div>
<div>Please help me in this regards</div>
<div>sikander</div>
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