Investigation of Ultrahigh-Pressure Phase Transitions in Metals with a Toroidal Diamond Anvil Cell
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Static compression experiments over 4 Mbar are rare, yet critical for developing accurate fundamental physics and chemistry models, relevant to a range of topics including modeling planetary interiors. Within this project we developed a toroidal diamond anvil geometry, crafted into single crystal diamonds with focused ion beam, with 9 μm culet proved capable of achieving pressures in excess of 5 megabars. The toroidal surface prevents gasket outflow and provides a means to stabilize the central culet. We have reached a maximum pressure of ~6.15 Mbar using Re as in-situ pressure marker, a pressure regime typically accessed only by double-stage diamond anvils and dynamic compression platforms. Moreover, utilizing these anvils for studying various transition metals the designs has proven to be a reliable platform, enabling routine static high-pressure studies in the 3 to 5 megabar pressure regime.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- DOE Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1573173
- Report Number(s):
- LLNL-TR-795799; 997218
- Country of Publication:
- United States
- Language:
- English
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