Deposition mechanism of BC2.5N heterodiamond under shock compression

Abstract

Transmission electron microscopy of shock compacted hexagonal BC_2.5N indicated the coexistence of morphologically and compositionally complex materials, a large proportion of cubic BC_2.5N (heterodiamond), trace amounts of amorphous heterodiamond, atomic-rearranged cubic BC_2.5N, an amorphous diamond-like material and onion-like heterofullerene. Such diversities of the products suggested liquid phase-to-solid phase deposition that is affected by the local heterogeneity in the cooling medium surrounding the liquid phase. The possibility of this mechanism was also suggested by kinetic estimations of the shock-compression process.