<div dir="ltr">Hello,<div><br></div><div>I need to do NEB calculations for my system. My system consists of Si 2*2*2 supercell with some Li impurities. Prior to NEB, I am doing a vc-relax calculation to get the minimum energy states for the first and the last images of the NEB. For the vc-relax, I set <b>ibrav = 1</b> for the symmetric cubic system. In the results obtained from vc-relax calculation, the cubic symmetry of the system is lost and I get the following call parameters for the initial and final state in the output file.</div>
<div><br></div><div><div>CELL_PARAMETERS (alat= 20.51108588)</div><div> 1.011059885 -0.002882944 -0.000008465</div><div> -0.002882944 1.011059885 0.000008465</div><div> -0.000008492 0.000008492 1.007297719</div>
<div><br></div><div><div>CELL_PARAMETERS (alat= 20.51108588)</div><div> 1.004932042 0.000000442 -0.000000442</div><div> 0.000000442 1.004688370 0.000104290</div><div> -0.000000442 0.000104290 1.004688370</div>
</div><div><br></div><div>Now, I am confused about my input file for the NEB. I can not just directly change the lattice constant by taking the cube root of the new volume obtained. I tried to set<b> ibrav = 0</b> and give the cell parameters obtained but I can only enter them once (correct me if I am wrong) and thus, can not incorporate both the set of cell parameters. I would be extremely thankful if anyone could suggest me a way to tackle this difficulty.</div>
<div><br></div><div><br></div><div>Thanks</div><div>Mitul Mundra</div><div>Final year Dual Degree Student</div><div>Department of Chemical Engineering</div><div>IIT Kanpur</div><div><br></div><div><br></div></div></div>