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April 8, 2024

Hexagonal boron nitride (HBN) Overview

Hexagonal boron nitride (h-BN) is a kind of synthetic inorganic material with many excellent properties, which is more and more widely used in a variety of new technologies and products, improving the technical level of modern industry and promoting the development of new material industry to deeper and wider fields.

Definition of hexagonal boron nitride

Hexagonal boron nitride (h-BN) is a hexagonal network of layer structure crystals composed of nitrogen and boron atoms, and it is the only boron nitride physical phase structure that exists in all the physical phases in nature. Its appearance is a white powder with a soft texture, which is loose, smooth, and easy to absorb moisture, and it has a layer structure similar to that of graphene, and thus it is also known as “white graphite”.

Structure of hexagonal boron nitride

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Hexagonal BN crystal structure   Hexagonal BN crystal sheet structure

From the molecular structure diagram, hexagonal boron nitride belongs to the hexagonal crystal system and has the same hexagonal crystal structure as graphene, consisting of multiple layers stacked together, with the different layers connected B-N-B by van der Waals forces, with lattice constants a=0.2506±0.0002 nm and c=0.667±0.0004 nm, and a density ρ=2.25 g/cm³.

Hexagonal boron nitride is very stable in air, has a wide band gap (5.1 eV), can withstand high temperatures up to 2270°C, and sublimes only at about 3000°C. Hexagonal boron nitride also has good insulation, thermal conductivity, and chemical stability, low thermal expansion/shrinkage, and is non-reactive with both weak acids and strong bases at room temperature.

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