Figure 4

(a) Trajectory projections of the Sn (red) and Se (black) atoms on the bc plane during AIMD simulations at T = 500 K under a hydrostatic pressure of 4 GPa. (b) Atomic distances between the adjacent Sn and Se atoms along the c axis; the solid line represents the atomic distances at ambient pressure and the discrete red square represents the atomic distance at 500 K under a hydrostatic pressure of 4 GPa.