Figure 3
From: Crystal structures and mechanical properties of osmium diboride at high pressure

Calculated phonon dispersion curves of (a,b) oP6-OsB2 at 0 and 200 GPa, (c,d) hP6-OsB2 at 0 and 440 GPa, and (e,f) oI12-OsB2 at 200 and 440 GPa, respectively.