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I always use EDIFF=1.0E-6 (OR 1.0E-5) and EDIFFG=-0.005 (eV/Ang.) This should be enough for some systems with 20, or 40 atoms; For this one, I use IBRION=2 to optimize both lattice parameters and atomic positions. After finishing the optimization, I will copy the CONTCAR to POSCAR, and redo the optimization, until the optimization is totally converged. I always use EDIFF=1.0e-5 (or 1.0e-4) and EDIFFG=-0.01 (eV/Ang) for systems with more than 80 or 200 atoms. For this one, I will first use IBRION=2 to converge the force less than 0.05 eV/Ang, then I use IBRION=1 to converge the force less than 0.01 eV/ang. Hope that it will be helpful... |
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24Â¥2017-03-15 23:32:29
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