<span style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">Dear Prof. Blaha and wien users,</span><br style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">
<br style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif"><span style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">Recently I am trying to do calculations on systems like La(x)Nb(1-x)O(y). I searched in the mailing list and the earliest comments showed up was posted around 2004. I saw comments like: "</span><span style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">VCA in WINE2k is only possible between neighboring elements, like Na-Mg or </span><span style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">Ba-La." But I have not seen any explanation for that yet.</span><div>
<span style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif"><br></span></div><div><span style="color:rgb(34,34,34);font-family:arial,sans-serif">May I ask the reason why we cannot use VCA for atoms which are not neighbors (like </span><span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px">La and </span><span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px">Nb</span><span style="color:rgb(34,34,34);font-family:arial,sans-serif">) in periodic table? Thanks a lot!</span></div>
<div><span style="color:rgb(34,34,34);font-family:arial,sans-serif"><br></span></div><div><span style="color:rgb(34,34,34);font-family:arial,sans-serif">Regards,</span></div><div><span style="color:rgb(34,34,34);font-family:arial,sans-serif">Qingyun Mao</span></div>
<div><span style="color:rgb(34,34,34);font-family:arial,sans-serif"><br></span></div><div><span style="color:rgb(34,34,34);font-family:arial,sans-serif">School of Applied and Engineering Physics</span></div><div><span style="color:rgb(34,34,34);font-family:arial,sans-serif">Cornell University</span></div>
<div><span style="color:rgb(34,34,34);font-family:arial,sans-serif"><br></span></div><div><span style="color:rgb(34,34,34);font-family:arial,sans-serif"><br></span></div>