Abstract
A hexagonal polymorph of diamond has been synthesized by relatively weak shock loading (in a range of projectile velocity 0.655 to 1.88 km sec−1) with a recovery technique. Four mixtures of copper with spectroscopic graphite, amorphous carbon, glassy carbon and graphite fluoride, with densities of 4.8 to 7.8 g cm−3, were used to control the shock temperature rise and to quench efficiently. Spectroscopic graphite gave the maximum yield of diamond (8%). Chaoite was also observed in the shocked amorphous carbon and glassy carbon. A local temperature rise during shock was inferred from the temperature of some spherical particles, indicative of superheating of the particles to near or above the melting point.
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Sekine, T., Akaishi, M., Setaka, N. et al. Diamond synthesis by weak shock loading. J Mater Sci 22, 3615–3619 (1987). https://doi.org/10.1007/BF01161469
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DOI: https://doi.org/10.1007/BF01161469