Abstract
Amorphous carbon (glassy carbon) samples were shock compressed up to 80 GPa and temperatures up to 1700 K for several microseconds. Glassy carbon samples before and after an explosive action are analyzed by X-ray diffraction, electron microscopy, and electron-probe microanalysis. It is shown that as a result of microsecond shock pressure exposure, glassy carbon is compacted to ρCG ≈ 2.3(5) g/cm3 and is partly transformed into a graphite-like nanomaterial with a cellular structure. At the level of crystallites, the density of glassy carbon increases via a decrease in the interplanar spacings and an increase in the crystallite thickness and width. Spheres from 20 nm to 80 μm in diameter are found to be formed during shock-wave compression of glassy carbon in a copper container and high-temperature shock heating posteffects. Spheres 20 μm in diameter consist of a copper-rich core and a carbon shell.
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Original Russian Text © A.M. Molodets, A.A. Golyshev, 2018, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2018, Vol. 153, No. 6, pp. 930–938.
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Molodets, A.M., Golyshev, A.A. Structural Transformations of Amorphous Carbon (Glassy Carbon) at High Shock Pressures. J. Exp. Theor. Phys. 126, 772–778 (2018). https://doi.org/10.1134/S1063776118060079
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DOI: https://doi.org/10.1134/S1063776118060079