Phase diagram of the B-B2O3 system at pressures to 24 GPa
  The evolution of topology of the B-B2O3 phase diagram has been studied at pressures up to 24 GPa using models of phenomenological thermodynamics with interaction parameters derived from experimental data on phase equilibria at high pressures and high temperatures. 
Vladimir Z. Turkevich, Dmitry V. Turkevich and Vladimir L. Solozhenko
cond-mat.mtrl-sci