Measurement of sodium chloride electrical conductivity under quasiisentropic compression to 140 GPa

Postnov, V. I.; Dremin, A. N.; Nabatov, S. S.; Shunin, V. M.; Yakushev, V. V.

doi:10.1007/bf00750458

Cited by 2 publications

(1 citation statement)

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“…The experimental configuration to measure electrical conductivity of soft liquid H 2 contained between two, stiff sapphire anvils is illustrated in figure 15 (Nellis et al 1999). Similar experiments were performed on other compressible materials by Yakushev et al (2000), Nabatov et al (1979) and Postnov et al (1983). Dynamic pressure is achieved by impact of a projectile accelerated up to ∼6 km s −1 .…”

Section: Electrical Conductivity Under Single Shock Compressionmentioning

confidence: 88%

Dynamic compression of materials: metallization of fluid hydrogen at high pressures

2006

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Dynamic high pressure is 1 GPa (10 kbar) or greater with a rise time and a duration ranging from 1 ps (10 −12 s) to 1 µs (10 −6 s). Today it is possible in a laboratory to achieve pressures dynamically up to ∼500 GPa (5 Mbar) and greater, compressions as much as ∼15fold greater than initial density in the case of hydrogen and temperatures from ∼0.1 up to several electronvolts (11 600 K). At these conditions materials are extremely condensed semiconductors or degenerate metals. Temperature can be tuned independently of pressure by a combination of shock and isentropic compression. As a result, new opportunities are now available in condensed matter physics at extreme conditions. The basic physics of the dynamic process, experimental methods of generating and diagnosing matter at these extreme conditions and a technique to recover metastable materials intact from ∼100 GPa shock pressures are discussed.Results include (i) generation of pressure standards at static pressures up to ∼200 GPa (2 Mbar) at 300 K, (ii) single-shock compression of small-molecular fluids, including resolution of the recent controversy over the correct shock-compression curve of liquid D 2 at 100 GPa pressures, (iii) the first observations of metallization of fluid hydrogen, nitrogen and oxygen compressed quasi-isentropically at 100 GPa pressures, (iv) implications for the interiors of giant planets within our solar system, extrasolar giant planets and brown dwarfs discovered recently and the equation of state of deuterium-tritium in inertial confinement fusion (ICF) and (v) prospects of recovering novel materials from extreme conditions, such as metastable solid metallic hydrogen. Future research is suggested.

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Section: Electrical Conductivity Under Single Shock Compressionmentioning

confidence: 88%

Dynamic compression of materials: metallization of fluid hydrogen at high pressures

2006

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On conductivity changes in shocked potassium chloride

Bourne

Townsend

Braithwaite

2005

Journal of Applied Physics

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A previous work has reported that shock loading of ionic crystals produces an induced polarization and changes in electrical conductivity. However, previous measurements recorded an integrated electrical signal comprising the induced electrical field and that due to current flow. For this reason a differential system was designed to separate these effects that was adapted from that used in the investigation of the conductivity of hydrogen under shock. The measurement removes voltages produced in the shock-induced electrical field, allowing determination of those resulting from resistance changes. Although the mechanical response of potassium chloride to shock has been studied extensively, the electrical response is less studied. Here, experiments are reported in which it is shocked to various stresses in order to observe conductivity changes. The range of stresses induced includes several mechanical thresholds, including the elastic-plastic transition, the B1:B2 phase transformation, and the overdriving of the shock faster than the elastic wave. The behavior observed when single crystal and targets pressed from granular material (to close to full density) are shocked around each of these thresholds is presented. The effects of loading to a particular stress in a single step or in multiple steps are discussed.

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Measurement of sodium chloride electrical conductivity under quasiisentropic compression to 140 GPa

Cited by 2 publications

References 1 publication

Dynamic compression of materials: metallization of fluid hydrogen at high pressures

Dynamic compression of materials: metallization of fluid hydrogen at high pressures

On conductivity changes in shocked potassium chloride

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