Implementation of micro-ball nanodiamond anvils for high-pressure studies above 6 Mbar

Leonid Dubrovinsky (), Natalia Dubrovinskaia (), Vitali B Prakapenka and Artem M Abakumov
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Leonid Dubrovinsky: Bayerisches Geoinstitut, Universität Bayreuth
Natalia Dubrovinskaia: Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth
Vitali B Prakapenka: Center for Advanced Radiation Sources, University of Chicago
Artem M Abakumov: EMAT, University of Antwerp

Nature Communications, 2012, vol. 3, issue 1, 1-7

Abstract: Abstract Since invention of the diamond anvil cell technique in the late 1950s for studying materials at extreme conditions, the maximum static pressure generated so far at room temperature was reported to be about 400 GPa. Here we show that use of micro-semi-balls made of nanodiamond as second-stage anvils in conventional diamond anvil cells drastically extends the achievable pressure range in static compression experiments to above 600 GPa. Micro-anvils (10–50 μm in diameter) of superhard nanodiamond (with a grain size below ∼50 nm) were synthesized in a large volume press using a newly developed technique. In our pilot experiments on rhenium and gold we have studied the equation of state of rhenium at pressures up to 640 GPa and demonstrated the feasibility and crucial necessity of the in situ ultra high-pressure measurements for accurate determination of material properties at extreme conditions.

Date: 2012
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DOI: 10.1038/ncomms2160

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