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Hugoniot and impact-induced phase transition of magnesite

¹ Advanced Materials Laboratory, National Institute for Materials Science, Namiki, Tsukuba, Ibaraki 305-0044, Japan
² Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, P.O. Box 919-102, Mianyang, Sichuan 621900, P.R. China
³ National Institute for Polar Research, 1-9-10 Kaga, Itabashi-ku, Tokyo 173-8515, Japan

Correspondence: ^* E-mail: sekine.toshimori{at}nims.go.jp

Hugoniot equation-of-state and release adiabat results are presented for magnesite to a pressure of ~140 GPa. A sharp change in the shock velocity and particle velocity relation suggests that a phase transition to a high-pressure phase occurs at 107±10 GPa. Decomposition of magnesite was observed by abrupt volume expansion during the pressure release from a pressure over the phase transition and by investigating post-shock magnesites recovered from hypervelocity impacts of mini-flyers performed using a laser-driven acceleration. Post-shock magnesites above 95 GPa contained MgO crystallites and the amount of MgO increased with increasing shock pressure.

Key Words: Magnesite • equation of state • high pressure • phase transition • decomposition