Direct nitridation of boron in nitrogen at 1400-1900C and
ammonium chloride and thiocyanate are used to increase the
reaction rate HBN
Reaction between BCl3 + NH3 at -70C B(NH2)3 or
Cl3B3N3H3. and then powder is heated at 1100C under N2
atmosphere BN
Reaction between BCl3 and NH4Cl at a reflux temperature
of 200C Cl3B3N3H3
then powder is heated at 1100C
under N2
atmosphere BN
Reaction between NaBH4 and NH4Cl at 170-180C. then
powder is heated at 1100C under N2 atmosphere BN