Study of the Structural Stability in Lithium and Sodium Undergoes High Pressures

In this work we made a study of the structural stability of lithium and sodium undergoes high pressures using a first principles local pseudopotential. This kind of study was made previously successfuly in magnesium [1]. We used the total energy like comparison criterion to investigate the structural stability of studied metals and have studied three structures: fcc, bbc and hcp. We have simulated the different pressures on the metals having varied the $r_s$ parameter, which is related with the electronic density parameter $n_0$. Finally, we found a prediction correct with the reports for the lithium, whereas for the sodium is partially correct the prediction obtained. \newline \newline [1] Ruiz-Chavarría, Gregorio. Phys. Lett. A,{\bf 336},210 (2005)