Pyrolytic Boron Nitride, abbreviated as Pyrolytic BN or PBN, also known as Chemical vapour-deposited Boron Nitride, Chemical Vapour-deposition of Boron Nitride or CVD-BN, etc. As the name suggests, this is a kind of boron nitride prepared by high temperature pyrolysis reaction by chemical vapor deposition method. Speaking of boron nitride, we must first talk about the two main structures of boron nitride: hexagonal and cubic. This is very similar to the two crystal forms of carbon: graphite and diamond. Hexagonal boron nitride and graphite are very similar in many respects, hence the name white graphite. Pyrolytic boron nitride is hexagonal boron nitride, but strictly speaking, it has a certain amount of disordered layer structure. The main feature of PBN prepared by chemical vapor deposition is that the purity is very high, which can reach more than 99.99%.
The structure and morphology of PBN
Pyrolytic Boron Nitride (PBN) belongs to the hexagonal system and is a typical layered material. The inter-layer and intra-layer atomic distances are quite different, the inter-layer atomic distance is 3.33