Structure of hexagonal boron nitride

Boron nitride (BN) is a novel wide-band gap nanomaterial with excellent properties and great development potential. It is a typical compound of group ⅲ - ⅴ, composed of nitrogen atoms and boron atoms. Nitrogen atoms and boron atoms combine with each other in different hybrid ways to form boron nitride with different phase structures: hexagonal boron nitride (H-BN), rhomboidal boron nitride (R-BN), cubic boron nitride (C-BN), wurtzite boron nitride (W-BN), and orthogonal boron nitride (O-BN). Among them, hexagonal boron nitride is the only boron nitride phase existing in nature.

Hexagonal boron nitride belongs to hexagonal crystal system, with the same hexagonal crystal structure as graphene. Its lattice constant A =0.2504nm, C =0.6661nm, is stacked by multi-layer structure. B-n-b between layers is connected by van der Waals force, easy to be peeled off, light in mass, non-conductive, with a wide band gap (5.1eV). It has the advantages of high hardness (Mohr hardness 2), high melting point (>3000K), high oxygen resistance of 900℃, high temperature resistance of 2000℃, low thermal expansion/shrinkage rate, good heat dissipation along the C-axis, and has a wide range of applications. Moreover, single or multi-layer hexagonal BORON nitrous tube nanomaterials can be crimped into hexagonal boron nitrous tube .