ABINIT Discussion Forums

I am stumped on what to do about the following:
1. I relax a structure of say 20 atoms to < 1x10-6 Ha/bohr (tolmxf 1.0d-6)

2. I use this relaxed structures acell and xred as inputs to the beginning of a phonon calculation that
has tolvrs 10d-18 .

3. when I get the forces back after the completion of the tolvrs,
they are bigger than 1x10-6 ha/bohr -- sometimes by 1-2 orders of magnitude.

My questions:
1. why is this?
2. what can I do to improve the forces for the tolvrs part?

tnx,
jb

Are you using the same ecutsm in your GS run for the phonons, that you used in the structural relaxation step? You should, it makes a big difference.