<div>Hi, all users of wien2k,</div>
<div> When calculating the elastic constants of a solid state material, will the fractional (x,y,z) of atoms change after applying strains? Taking the cubic structure as an example, there are only three independent elastic constants, C11, C12, and C44. Tetragonal distortion and rhombohedral one as well as structural optimization are used to calculate the three elastic constants. I want to know whether the fractional (x,y,z) of atoms will change in the distorted unit cell. And how about the space group? If the space group and the fractional (x,y,z) of atoms change, how to determine the space group and the fractional (x,y,z) of atoms of the distorted unit cell? I know the wien2k can calculate the elastic constants of cubic structures automatically, but I want to know the calculation process of elastic constants and calculate the elastic constants of other non-cubic structures. Thank you very much for your advice in advance.
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<div> Best regards.</div>
<div> Yours sincerely,</div>
<div> Jian Zhu<br> </div>