Heterodiamond is a superhard material containing boron, carbon, and nitrogen (BCN).
The heterodiamond is a polycrystalline material coagulated with nano-crystallites and the fine powder is tinged with deep bluish black.
The heterodiamond has both the high hardness of diamond and the excellent heat resistance of cubic BN.
These characteristic properties are due to the diamond structure combined with the sp3 σ-bonds among carbon and the heteroatoms.
[1] Cubic BC2N can be synthesized from graphite-like BC2N at pressures above 18 GPa and temperatures higher than 2,200 K (1,930 °C).