Review and progress in the study of the properties of warm dense matter

Chen, QiFeng; Gu, Yu; Zheng, Jian; Li, JiangTiao; Li, Zhiguo; Quan, Weilong; Fu, Zhen‐Guo; Li, Chengjun

doi:10.1360/n972016-00471

Cited by 3 publications

(5 citation statements)

References 26 publications

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“…( 18) to the pressure of the Thomas-Fermi-Kirzhnits model. The EOS model without pressure modification accords with experimental data at the density of 0.1 g/cm 3 , while generates noticeably lower pressure than experimental measurements at the density of 0.3 g/cm 3 . The value and variation trend in internal energy-pressure isochore curve of 0.3 g/cm 3 is greatly improved with practical modification made to the Thomas-Fermi-Kirzhnits model.…”

Section: Theoretical Results and Comparison With Experimental Datasupporting

confidence: 77%

“…The fitting parameters in Table 1 for aluminum are determined based on the method described in the above section. In the construction process of the EOS model, the temperature, density, pressure, and internal energy are in units of kK, g/cm 3 , GPa, and kJ/g, respectively.…”

Section: Theoretical Results and Comparison With Experimental Datamentioning

confidence: 99%

“…The pressure and internal energy variation of aluminum at densities of 0.1 g/cm 3 and 0.3 g/cm 3 were measured using a homogeneous and thermally equilibrated plasma produced inside a closed vessel in the energy range 20-50 kJ/g by Renaudin [1] and the isochore measurements were frequently used to verify the newly-established EOS models in warm dense matter regime. The pressure as a function of internal energy at densities of 0.1 g/cm 3 and 0.3 g/cm 3 derived from the present EOS model and comparison with experimental data are shown in Fig.…”

Section: Theoretical Results and Comparison With Experimental Datamentioning

confidence: 99%

“…However, those theories are not feasible to calculate the properties of warm dense matter, in which partial ionization, strong correlations, and quantum effects are important, resulting in immense challenges to describe the behavior of warm dense matter accurately. [3] EOS determines the fundamental thermodynamic properties of matter in hydrodynamic simulation. It is a crucial tool in interpreting the experimental results of warm dense matter.…”

Section: Introductionmentioning

confidence: 99%

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Equation of state for aluminum in warm dense matter regime

et al. 2019

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A semi-empirical equation of state model for aluminum in a warm dense matter regime is constructed. The equation of state, which is subdivided into a cold term, thermal contributions of ions and electrons, covers a broad range of phase diagram from solid state to plasma state. The cold term and thermal contribution of ions are from the Bushman-Lomonosov model, in which several undetermined parameters are fitted based on equation of state theories and specific experimental data. The Thomas-Fermi-Kirzhnits model is employed to estimate the thermal contribution of electrons. Some practical modifications are introduced to the Thomas-Fermi-Kirzhnits model to improve the prediction of the equation of state model. Theoretical calculation of thermodynamic parameters, including phase diagram, curves of isothermal compression at ambient temperature, melting, and Hugoniot, are analyzed and compared with relevant experimental data and other theoretical evaluations.

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Section: Theoretical Results and Comparison With Experimental Datasupporting

confidence: 77%

Section: Theoretical Results and Comparison With Experimental Datamentioning

confidence: 99%

Section: Theoretical Results and Comparison With Experimental Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Equation of state for aluminum in warm dense matter regime

et al. 2019

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“…Most of the data, such as equation of states (EOS) from cold condensed matter to hot dense matter (HDM), are patchworks whose ele ments are drawn from various methods under different density and temperature regimes. The field of WDM is developing rapidly, and there have been a number of reviews of theor etical and experimental progress in structures and properties of WDM [4,6,[83][84][85]. Here, we focus on two models, and their applications, which have been developed in our group.…”

Section: Introductionmentioning

confidence: 99%

Dynamic electron–ion collisions and nuclear quantum effects in quantum simulation of warm dense matter

Kang

Dai²

2018

J. Phys.: Condens. Matter

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The structural, thermodynamic and transport properties of warm dense matter (WDM) are crucial to the fields of astrophysics and planet science, as well as inertial confinement fusion. WDM refers to the states of matter in a regime of temperature and density between cold condensed matter and hot ideal plasmas, where the density is from near-solid up to ten times solid density, and the temperature between 0.1 and 100 eV. In the WDM regime, matter exhibits moderately or strongly coupled, partially degenerate properties. Therefore, the methods used to deal with condensed matter and isolated atoms need to be properly validated for WDM. It is therefore a big challenge to understand WDM within a unified theoretical description with reliable accuracy. Here, we review the progress in the theoretical study of WDM with state-of-the-art simulations, i.e. quantum Langevin molecular dynamics and first principles path integral molecular dynamics. The related applications for WDM are also included.

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Investigation on equation of state and ionization equilibrium for aluminum in warm dense matter regime

Wang¹,

Wang²,

Zhang³

et al. 2020

Acta Phys. Sin.

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Warm dense matter is widely found in the high-energy-density-physics researches, such as inertial confinement fusion, X-ray source and wire-array Z-pinch. The equation of state and ionization equilibrium of material in warm dense matter regime play a significant role in explaining experimental results and simulations of physical process. In this paper, the Coulomb interaction between charged particles, and the excluded volume effect due to high density and polarization effect between neutral atoms and charged particles are considered in the equation of state for aluminum in warm dense matter regime. A non-ideal Saha equation is used to account for the ionization equilibrium. The data for pressure and concentration of particles of aluminum plasma are derived by iteration between equation of state and ionization equilibrium model. The pressure and average ionization degree of aluminum plasma are consistent with the calculation results from other models and relevant experimental data. The Coulomb interaction, which dominants the non-ideal effects, is insensitive to temperature and increases with density rising especially near the region of critical density. The excluded volume effect peaks at a density of ～0.5 g/cm3. The polarization effect first becomes stronger with density increasing and then decreases at a density of ～0.4 g/cm3. The ionization equilibrium results with density ranging from 1.0 × 10–4 g/cm3 to 3.0 g/cm3 and temperature ranging from 1.0 × 104 K to 3.0 × 104 K reveal that the average ionization degree increases with density sharply increasing near the critical density. The non-ideal effects, which lead the ionization energy to decline and the effective ionization potential of specific ions in aluminum plasma to decrease substantially, are responsible for the sharp increase of average ionization degree near the region of critical density. When the temperature is lower than 12000 K, first and second stage of ionization occur in aluminum plasma, and the system is mainly composed of Al1+, Al2+ and electrons. The average ionization degree can reach 2 at critical density. The third stage of ionization is dominant in the aluminum plasma when plasma temperature is higher than 12000 K. And then, the charged particles in the plasma are composed of Al3+ and electrons, allowing the average ionization degree to reach 3 at critical density.

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Review and progress in the study of the properties of warm dense matter

Cited by 3 publications

References 26 publications

Equation of state for aluminum in warm dense matter regime

Equation of state for aluminum in warm dense matter regime

Dynamic electron–ion collisions and nuclear quantum effects in quantum simulation of warm dense matter

Investigation on equation of state and ionization equilibrium for aluminum in warm dense matter regime

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