<div dir="ltr"><table cellpadding="0"><tbody><tr><td><table cellpadding="0"><tbody><tr><td><br></td></tr></tbody></table></td><td><div>Dear users and experts,</div><div><br></div><div>I am conducting a
study on the pressure effect on a tetragonal structure. I have followed
the following steps to determine the lattice parameters at different
pressures:<br><br>1)Relaxation of the initially reported experimental structure.<br>2)Testing
the convergence of parameters such as energy cutoff (ecut), k-point
mesh (kmesh), and lattice parameters by varying celldm(3).<br>3)Applying
the Murnaghan equation to obtain volumes and lattice parameters
associated with different pressures based on the data from the
lattice-parameter convergence.<br>4)Performing relaxation and
lattice-parameter convergence (by varying celldm(3)) for each structure
corresponding to different pressures.<br></div><div><br></div><div>After the calculations, I obtained the following volumes and pressures:</div><div></div><div>0 GPa 2799.87 (au^3)<br></div><div>5 GPa 2799.11 (au^3)</div><div>10 GPa 2807.17(au^3)</div><div>15 GPa 2814.35(au^3)<br>20GPa 2760.07(au^3)<br>25GPa 2680.36(au^3)<br>30GPa 2755.89(au^3)</div><div><span style="white-space:pre-wrap"><br></span></div><div><span style="white-space:pre-wrap">I am concerned about the observed increase in volume with increasing pressure. I would appreciate your help in identifying any mistakes I may have made in the steps outlined above.</span></div><div><span style="white-space:pre-wrap"><br></span></div><div><span style="white-space:pre-wrap">Thank you for your assistance.<font color="#888888"><br></font></span></div><div><span style="white-space:pre-wrap"><font color="#888888"><br></font></span></div><div><span style="white-space:pre-wrap"><font color="#888888">With Regards</font></span></div><div><div><span style="white-space:pre-wrap"><font color="#888888">Dr. Anupriya Nyayban</font></span></div><font color="#888888"><div><span style="white-space:pre-wrap">Postdoctoral project associate<br></span></div><div><span style="white-space:pre-wrap">IIT Madras</span></div></font></div></td></tr></tbody></table></div>