Self-propagating high-temperature synthesis of boron subphosphide, B12P2
  Two new methods to produce nanopowders of B12P2 boron subphosphide by self-propagating high-temperature synthesis have been proposed. Bulk polycrystalline B12P2 with microhardness of HV = 35(3) GPa and stability in air up to 1300 K has been prepared by sintering these powders at 5.2 GPa and 2500 K. 
Vladimir A. Mukhanov, Petr S. Sokolov, Ovidiu Brinza, Dominique Vrel   and Vladimir L. Solozhenko
cond-mat.mtrl-sci