<div>Dear Wien users,</div> <div> </div> <div>I calculated the elastic constants for <A class=p href="http://www.google.com/search?hl=en&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=antifluorite&spell=1"><B><I><FONT color=#0000cc>antifluorite</FONT></I></B></A> compunds, but right-now I have problem for gatting negative values for c12 elastic constant?</div> <div> </div> <div>I tried to increase the number of kpoints, it doesn't work, I can't figure out the problem come from what.</div> <div> </div> <div>Does someone know how to solve the problem? your help is highly appreciate.</div> <div> </div> <div>Regards.</div> <div> </div> <div>Halim</div><p> 
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