Growth of whiskers of hexagonal boron nitride - Ishii, T.; Sato, T.; Sekikawa, Y.; Iwata, M. (Elsevier)
When h-BN powder containing a sufficient amount of oxygen was heated between 1750 and 2100^oC in nitrogen atmosphere containing carbon, h-BN whiskers grew at 1500^oC region. The whiskers were classified into two types in terms of crystal structure. The first type belongs to the hexagonal crystal system and the second belongs to the rhombohedral crystal system. The two types could not be converted into each other, even by heat-treatment for 2h at 2100^oC. Together with these whiskers grew some filamentary crystals of h-BN having curious and complicated morphologies. The relations among their morphologies are discussed in this paper.
http://linkinghub.elsevier.com/retrieve/pii/0022-0248(81)90206-2
Keywords: V; TE-TZ; U