Fig. 3: Enthalpy of various competing phases of WB2 as a function of pressure.
From: Creating superconductivity in WB2 through pressure-induced metastable planar defects
The hP6 phase of WB2 has the lowest enthalpy at ambient pressure, and the enthalpies of hP12 and hR6 structures are higher only 16 and 7 meV/atom, respectively.
