<div dir="auto">It worked when I made 1x1x1 supercell and replaced 1 Mn atom with Ca</div><br><div class="gmail_quote"><div dir="ltr">On Thu, 12 Jul 2018, 7:30 pm Riyajul Islam, <<a href="mailto:riyajul80@gmail.com">riyajul80@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">I did change some atoms. First I made supercell of MnFe2O4 then I replaced Mn with Ca. </div><br><div class="gmail_quote"><div dir="ltr">On Thu, 12 Jul 2018, 7:28 pm Laurence Marks, <<a href="mailto:L-marks@northwestern.edu" target="_blank" rel="noreferrer">L-marks@northwestern.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span style="font-family:sans-serif;font-size:12.8px">As was mentioned before, the cell you have is Pmma. If you want a 2x2x2 supercell, you need to change just one atom and/or break symmetry.</span><div style="font-family:sans-serif;font-size:12.8px" dir="auto"><br></div><div style="font-family:sans-serif;font-size:12.8px" dir="auto">N.B., Ca6+? Unreasonable, it may never converge.</div>
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