DEPOSITION MECHANISM OF BC2.5N HETERODIAMOND UNDER SHOCK COMPRESSION

Transmission electron microscopy of shock compacted hexagonal BC2.5N i ndicated the coexistence of morphologically and compositionally comple x materials, a large proportion of cubic BC2.5N (heterodiamond), trace amounts of amorphous heterodiamond, atomic-rearranged cubic BC2.5N, a n amorphous diamond-like material and onion-like heterofullerene. Such diversities of the products suggested liquid phase-to-solid phase dep osition that is affected by the local heterogeneity in the cooling med ium surrounding the liquid phase. The possibility of this mechanism wa s also suggested by kinetic estimations of the shock-compression proce ss.