Figure 2

Enthalpies of various B allotropes. (a) The relative enthalpies of various B allotropes (see Supplementary Figure 4) plotted as a function of pressure. (b) The relative enthalpies of five hex-Bν allotropes with different concentrations of B vacancies, ν=5/32, 1/7, 1/8, 3/28 and 3/32, as a function of pressure.