Hydrogen at high pressure

Maksimov, Evgenii G.; Shilov, Yu. I.

doi:10.3367/ufnr.0169.199911c.1223

Cited by 24 publications

(6 citation statements)

References 88 publications

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“…This possibility is theoretically confirmed by quantum-mechanical calculations made by the Monte Carlo method [10]. After the impressive breakthrough in the experimental studies of hydrogen in the metallic state, theoretical studies of its various properties in broad ranges of densities and pressures [11,12] become increasingly important. This refers, in particular, to the conditions that are specific to the cores of giant planets in the solar system, namely, Jupiter, Saturn, Uranus, and Neptune.…”

Section: Introductionmentioning

confidence: 68%

Metal-Dielectric Transition in Hydrogen

Shvets

Vlasenko

2008

Acta Phys. Pol. A

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The electrical resistivity of liquid metallic hydrogen at a temperature of 3000 K and a density of 0.35 mol/cm 3 is calculated. Hydrogen is considered as a three-component system consisting of electrons, protons, and neutral hydrogen atoms. The second order of perturbation theory in electron-proton and electron-atom interactions is used to determine the inverse relaxation time for electric conductivity. The Coulomb electron-electron interaction is taken into account in the random phase approximation and the exchange interaction and correlation of conductivity electrons are included in the local--field approximation. The model of hard spheres is used for the proton and atomic subsystems. The concentration of the electrically neutral atomic component proved to be significantly lower than the value assumed by the discoverers of metallic hydrogen.

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Section: Introductionmentioning

confidence: 68%

Metal-Dielectric Transition in Hydrogen

Shvets

Vlasenko

2008

Acta Phys. Pol. A

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“…It is convenient to consider the energy of the electron subsystem and the energy of the interaction between the electron and proton subsystems simultaneously. The sum of these energies, the energy of the ground state of the electron gas in the field of protons, can be expanded in powers of the electron-proton interaction [12]: (9) In turn, in each order in the electron-proton interaction, the relevant term should be expanded in a series in the electron-electron interaction. The zero-order term in the electron-proton and electron-electron interactions is the kinetic energy of an ideal electron gas.…”

Section: Internal Energymentioning

confidence: 99%

“…In 1978, the first report appeared on the discovery of metallic hydrogen [5] at a pressure of 2 Mbar. Today, the equilibrium properties of metallic hydrogen are being intensively investigated [6][7][8][9]. The significance of these investigations is largely attributed to the fact that certain equilibrium characteristics of metallic hydrogen, such as density and temperature, are measured with regard to the extreme conditions of its existence under terrestrial conditions.…”

Section: Introductionmentioning

confidence: 99%

High temperature equation of state of metallic hydrogen

Shvets¹

2007

J. Exp. Theor. Phys.

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The equation of state of liquid metallic hydrogen is solved numerically. Investigations are carried out at temperatures from 3000 to 20000 K and densities from 0.2 to 3 mol/cm 3 , which correspond both to the experimental conditions under which metallic hydrogen is produced on earth and the conditions in the cores of giant planets of the solar system such as Jupiter and Saturn. It is assumed that hydrogen is in an atomic state and all its electrons are collectivized. Perturbation theory in the electron-proton interaction is applied to determine the thermodynamic potentials of metallic hydrogen. The electron subsystem is considered in the randomphase approximation with regard to the exchange interaction and the correlation of electrons in the local-field approximation. The proton-proton interaction is taken into account in the hard-spheres approximation. The thermodynamic characteristics of metallic hydrogen are calculated with regard to the zero-, second-, and thirdorder perturbation theory terms. The third-order term proves to be rather essential at moderately high temperatures and densities, although it is much smaller than the second-order term. The thermodynamic potentials of metallic hydrogen are monotonically increasing functions of density and temperature. The values of pressure for the temperatures and pressures that are characteristic of the conditions under which metallic hydrogen is produced on earth coincide with the corresponding values reported by the discoverers of metallic hydrogen to a high degree of accuracy. The temperature and density ranges are found in which there exists a liquid phase of metallic hydrogen.

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“…Hydrogen has a special interest for many fields of research as it represents the perfect model object due to its seeming simplicity and abundance in the cosmos [1][2][3][4]. One of the objectives of studying hydrogen at extreme pressures is to rationalize the notion of metallic hydrogen as a future energy carrier.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen at extreme pressures (Review Article)

Goncharov

Howie

Gregoryanz

2013

Low Temperature Physics

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Here we review recent experimental and theoretical studies of hydrogen approaching metallization regime. Experimental techniques have made great advances over the last several years making it possible to reach previously unachievable conditions of pressure and temperature and to probe hydrogen at these conditions. Theoretical methods have also greatly improved; exemplified through the prediction of new structural and ordered quantum states. Recently, a new solid phase of hydrogen, phase IV, has been discovered in a high-pressure high-temperature domain. This phase is quite unusual structurally and chemically as it represents an intermediate state between common molecular and monatomic configurations. Moreover, it shows remarkable fluxional characteristics related to its quantum nature, which makes it unique among the solid phases, even of light elements. However, phase IV shows the presence of a band gap and exhibits distinct phonon and libron characteristic of classical solids. The quantum behavior of hydrogen in the limit of very high pressure remains an open question. Prospects of studying hydrogen at more extreme conditions by static and combined static-dynamic methods are also presented. PACS: 64.30.Jk Equations of state of nonmetals; 67.80.F-Solids of hydrogen and isotopes.

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Hydrogen at high pressure

Cited by 24 publications

References 88 publications

Metal-Dielectric Transition in Hydrogen

Metal-Dielectric Transition in Hydrogen

High temperature equation of state of metallic hydrogen

Hydrogen at extreme pressures (Review Article)

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