Abstract

Measurements of the transition pressure and rate under shock compression of different graphites at different sample orientations have been carried out with the goal to verify possible mechanisms of the graphite‐diamond transformation. The materials tested were highly orientated pyrolytic graphite (HOPG) plates and pressed samples of several kinds of natural and synthetic graphite. It has been found the shock direction significantly affects the detected pressure of the transformation and its rate. The effect is more pronounced in more ordered graphite. The transition pressure and rate depend also on the crystallite size and the grain size. Content of rhombohedral phase (up to 30%) does not strongly influence the transformation parameters.

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