<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Dear all,<br /></div><div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><br /></div><div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">I
am facing an issue while running AIMD simulations of a box of ~1000
atoms. The system is an amorphous MOF made of Fe linked by benzene
tricarboxylate (named Fe-BTC).</div><div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><br /></div><div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">I
use PBE functional with DZVP basis set and GTH pseudopotential ; DIIS
method and FULL_KINETIC preconditioner. I perform the calculation from a
restart file. The first steps of the MD are quite fast with ~10 SCF
steps per MD step. But along the AIMD run, the SCF cycles become longer
and longer (~100 SCF steps per MD step). <br /></div><div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><br /></div><div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">I
tried to use other OT method such as CG or other preconditioner such as
FULL_SINGLE_INVERSE but in both cases the SCF cycles are taking too
much time and sometimes fail to converge. Besides, FULL_ALL
preconditioner is too computationally expensive in terms of memory.<br /></div><div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><br /></div><div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Do you have some ideas of the origin of this increase of the SCF cycles? I attached the restart file to the message. <br /></div><div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><br /></div><div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Thanks in advance for your help,</div><div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><br /></div><div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Kind regards,</div><div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><br /></div><div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Dune André<br /></div>
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