<div>Dear Wien2k users,</div>
<div> </div>
<div> I know the "optimize" procedure very well but my problem is for the materials which have van der walls forces between their components. As you know I can not consider the biger volume even 1.5 times larger? How can I calculate the bulk moduli?
</div>
<div>Thanks for your attention</div>
<div>Samaneh</div>