Electrical conductivity of water during quasi-isentropic compression to 130 GPa

Yakushev, V. V.; Postnov, V. I.; Фортов, В. Е.; Yakysheva, T. I.

doi:10.1134/1.559145

Cited by 28 publications

(16 citation statements)

References 15 publications

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“…1 An electrical conductivity of at least ϳ10 ͑⍀ cm͒ −1 is thought to be required to generate the observed magnetic fields. 4 Conductivity values of up to ϳ10-ϳ 200 ͑⍀ cm͒ −1 have been measured for both shock-compressed water [5][6][7] and for a "synthetic Uranus" 8 mixture of fluids, and have been predicted by molecular dynamics simulations. 9 A larger value of conductivity relaxes the velocity and length scales for a self-sustaining dynamo.…”

Section: Introductionmentioning

confidence: 99%

Laser-driven shock experiments on precompressed water: Implications for “icy” giant planets

Lee

Benedetti

Jeanloz

et al. 2006

The Journal of Chemical Physics

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Laser-driven shock compression of samples precompressed to 1 GPa produces high-pressure-temperature conditions inducing two significant changes in the optical properties of water: the onset of opacity followed by enhanced reflectivity in the initially transparent water. The onset of reflectivity at infrared wavelengths can be interpreted as a semiconductor↔ electronic conductor transition in water, and is found at pressures above ϳ130 GPa for single-shocked samples precompressed to 1 GPa. Our results indicate that conductivity in the deep interior of "icy" giant planets is greater than realized previously because of an additional contribution from electrons.

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Section: Introductionmentioning

confidence: 99%

Laser-driven shock experiments on precompressed water: Implications for “icy” giant planets

Lee

Benedetti

Jeanloz

et al. 2006

The Journal of Chemical Physics

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“…Although a direct experimental proof of the superionic structure is still needed, there is strong indication of its existence by a kink in the melting line of ice VII [16][17][18][19][20]. Furthermore, static [21] and dynamic compression techniques [22,23] were used to measure the conductivity of dense proton-conducting states of water. Theoretical conductivity calculations for superionic water (SIW) can reproduce such measurements with reasonable accuracy [24,25].…”

Section: Introductionmentioning

confidence: 99%

Ab initiocalculation of thermodynamic potentials and entropies for superionic water

2016

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We construct thermodynamic potentials for two superionic phases of water [with body-centered cubic (bcc) and face-centered cubic (fcc) oxygen lattice] using a combination of density functional theory (DFT) and molecular dynamics simulations (MD). For this purpose, a generic expression for the free energy of warm dense matter is developed and parametrized with equation of state data from the DFT-MD simulations. A second central aspect is the accurate determination of the entropy, which is done using an approximate two-phase method based on the frequency spectra of the nuclear motion. The boundary between the bcc superionic phase and the ices VII and X calculated with thermodynamic potentials from DFT-MD is consistent with that directly derived from the simulations. Differences in the physical properties of the bcc and fcc superionic phases and their impact on interior modeling of water-rich giant planets are discussed.

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“…12,13 Reverberating shock compression experiments achieved the off-principal Hugoniot states up to 230 GPa ͑Ref. 5͒ and 180 GPa and 5400 K. 14,15 The available shock compression data, except for the reverberating shock experiments, are at lower pressure or much higher temperature than the planetary isentrope. Reverberating shock experiments are limited by the capacity of facilities and also complicated experimental procedures and data interpretations.…”

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confidence: 99%

Significant static pressure increase in a precompression cell target for laser-driven advanced dynamic compression experiments

et al. 2010

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Laser shock compression experiments on precompressed samples offer the possibility to explore extreme material states unreachable by static or single-shock compression techniques alone. We have found significant increases in static compression pressure in a wide-opening and thin diamond precompression cell. This suggests that the precompression target is adaptable to advanced coupling techniques with laser-driven dynamic compression methods. The novel coupling techniques proposed give the potential to access outstanding material states required in planetary and condensed-matter physics.

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Electrical conductivity of water during quasi-isentropic compression to 130 GPa

Cited by 28 publications

References 15 publications

Laser-driven shock experiments on precompressed water: Implications for “icy” giant planets

Laser-driven shock experiments on precompressed water: Implications for “icy” giant planets

Ab initiocalculation of thermodynamic potentials and entropies for superionic water

Significant static pressure increase in a precompression cell target for laser-driven advanced dynamic compression experiments

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