Nanosized and large crystals of hexagonal boron nitride by SHS under high pressures of nitrogen gas

Nanocrystalline powder of hexagonal boron nitride (h-BN) was prepared by SHS reaction of boron powder with nitrogen gas under pressures up to 150 MPa. At higher nitrogen pressures (up to 1000–2000 MPa), the reaction products were found to contain melted h-BN.