Single crystal toroidal diamond anvils for high pressure experiments beyond 5 megabar

Zs. Jenei (), E. F. O’Bannon, S. T. Weir, H. Cynn, M. J. Lipp and W. J. Evans
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Zs. Jenei: Lawrence Livermore National Laboratory
E. F. O’Bannon: Lawrence Livermore National Laboratory
S. T. Weir: Lawrence Livermore National Laboratory
H. Cynn: Lawrence Livermore National Laboratory
M. J. Lipp: Lawrence Livermore National Laboratory
W. J. Evans: Lawrence Livermore National Laboratory

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: Abstract 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. Here we show that focused ion beam crafted toroidal single-crystal diamond anvils with ~9.0 μm culets are capable of producing pressures over 5 Mbar. 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. Optimizing single-crystal diamond anvil design is key for extending the pressure range over which studies can be performed in the diamond anvil cell.

Date: 2018
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DOI: 10.1038/s41467-018-06071-x

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