[Wien] van der wals

[samaneh javan]

Dear Wien2k users,
 I know the "optimize" procedure very well but my problem is on the
materials which have week van der walls forces between their components. As
you
know I can not consider the bigger volume even 1.5  times larger? Then, how
can I calculate
bulk moduli for these kind of materials?
Thanks in advance
Samaneh
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