Aerosol Synthesis of Spherical Morphology Boron Nitride Powders from Organoborate Precursors

The reaction of aerosol droplets of the organoborate reagent (MeO)3B, suspended in nitrogen, with gaseous ammonia in a flight tube heated to 800−1500 °C was used to produce, in high yield, spherical morphology precursor powders BN x O y Cz that contain decreasing amounts of oxygen and carbon as the process temperature and mole fraction of ammonia increased. Subsequent static nitridation of the precursor powder under ammonia gave spherical morphology BN powders with low (