SHOCK INDUCED PHASE TRANSITION IN DIAMOND

Y Lin and R Perriot and VV Zhakhovsky and X Gu and CT White and II Oleynik, SHOCK COMPRESSION OF CONDENSED MATTER - 2011, PTS 1 AND 2, 1426 (2012).

DOI: 10.1063/1.3686488

Shock wave propagation in diamond along the 110 crystallographic direction was simulated by molecular dynamics (MD) using the reactive empirical bond order (REBO) potential. A new regime of shock wave propagation was observed involving split elastic-elastic shock waves for the range of piston velocities between 2.0 and 4.1 km/s, and longitudinal stresses 126-278 GPa. The two-wave elastic-elastic splitting is caused by a stress-induced structural phase transition from a standard, low-pressure, to a high-pressure phase of REBO diamond, which takes place in the interval of pressures below the Hugoniot elastic limit. The observed phase coexistence in the second elastic shock wave is associated with a non-monotonic longitudinal stress-strain relationship upon uniaxial compression along 110 crystallographic direction.

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