<div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial">First of all, please make sure that the model you computed has been fully relaxed. Then, while the model was big, the lower alpha_mix(1), default as 0.7, may be helpful for the SCF convergence during ph.x process.<br><br><div>--<br><div>GAO Zhe, Dr.,
<div>Research Engineer, Quartz,</div>
<div>Saint-Gobain Research (Shanghai),</div>
<div>No. 55, Wenjing-road, Minhang-district, Shanghai, China</div></div></div><div id="divNeteaseMailCard"></div><br>At 2013-04-29 09:47:18,"李晓川" <18733462676@163.com> wrote:<br> <blockquote id="isReplyContent" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial"><div>dear all</div>
<div> when I computed the scf of phonon,the convergnece is always not attained,I tried changing the "tr2_ph" and "alpha_mixing" to accelarate the speed of convergnece ,But the results is not ideal.So i want to know what can i do to perform the convergence of phonon.e.g.which parameters can be changed ?</div>
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