High yield of crystalline carbyne was obtained as a result of shock
compression of pyrographite of monochromator grade.
Twenty micron's graphite foil was placed between two teflon discs with
diameter 10 mm and thickness 2 mm. The samples were compressed in
recovery assembly of plane symmetry. Peak pressure was 36 GPa. The
duration of upper plateau of the pressure pulse was about 2 m s. In
this assembly, temperature of graphite foil was defined by shock
temperature of teflon.
Recovered samples were examined by means X-ray diffraction. Large
amount of carbyne crystals was detected. Volume fraction of carbyne
appeared to be 60-80 %.
We examined thick graphite samples (of about 0.5 mm), placed into
teflon container and loaded up to shock pressure 36 GPa. Carbyne was
formed on the surface of graphite, only. We also carried out
experiments with graphite foils, placed between two thick copper
discs. The assembly was loaded up to the same pressure (36 GPa). We
did not detect any trace of carbyne in this case.
The shock temperature of graphite, copper and teflon at the pressure
36 GPa are 893 K, 538 K and 1753 K, respectively. We propose, that
temperature is a critical parameter for the process of high pressure
synthesis of carbyne.

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