Ray Diffraction Analysis of Postshock Samples

2) lowering and broadening of the (002) diffraction line occurred by the shock treatment. This phenomenon appeared remarkably in the XRD pattern of postshock sample II compared with that of postshock sample I  

4) in the case of postshock sample II, besides the (111) reflection of / -diamond, new peaks identified as y-carbon appeared at 43.88°, 50.88° and 74.71° in the X-ray pattern of the middle outer part. 

The characteristic of datum (1) shows the shock effects on the starting graphite that resulted in more graphitized structures and diamond formation [25]. The datum (2) shows that the lattice strain in postshock sample II is more severe than that in postshock sample I. The data (3) and (4) suggest that defects play an important role in phase transition of graphite to diamond because the appearance of the diffraction line at 43.88° corresponds to the (111) reflection of diamond. 

Phase Transition of Graphite to Diamond or Diamond-Like Carbon 

8 Calculated after Palatnik et al. b Forbidden reflections in Fd3m 

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