A modified Van der Waals model for the coexistence curve of expanded metals

Ross, Marvin; Hensel, F.

doi:10.1088/0953-8984/8/12/006

Cited by 28 publications

(12 citation statements)

References 17 publications

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“…In low-density states, a tendency was revealed toward formation of metallic clusters of above-average density, with the distances between these clusters increasing gradually with decreasing average density. This scenario for the behavior of liquid metal in the vicinity of metal-nonmetal transition was suggested by Ross and Hensel [41]. Our data on the distribution of Voronoi polyhedrons agree with this scenario.…”

Section: Discussion Of the Resultssupporting

confidence: 89%

Application of the embedded atom model to liquid metals: Liquid mercury

Belashchenko¹

2006

High Temp

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The procedure is suggested for the calculation of the embedded atom potential for a liquid metal, which involves the use of diffraction data on the structure of material in the vicinity of the melting point. The procedure is used for mercury at temperatures from 293 to 1803 K. The data on the structure of mercury at 293 K and the thermodynamic properties of mercury at 293 and 1673 K are used in selecting the parameters of embedded atom potential. The calculated critical temperature for mercury is close to the actual value of 1750 K. The self-diffusion coefficients increase with temperature by the power law. The variation of the structure characteristics of liquid metal with the temperature increasing by several hundred degrees is described correctly. However, at temperatures above 1000 K, the predicted structure of models differs appreciably from the actual structure. These differences are explained by the dependence of the real potential of interparticle interaction of mercury on density during the metal-nonmetal transition occurring in the case of heating.

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Section: Discussion Of the Resultssupporting

confidence: 89%

Application of the embedded atom model to liquid metals: Liquid mercury

Belashchenko¹

2006

High Temp

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“…For the understanding of the M-NM transition in expanded fluid Hg taking places at a rather large density of 9 g cm À3 , it was pointed out that the density fluctuations near the critical point play an important role [33,34]. By taking fluctuations in the local coordination number into account, Franz [35] showed that a band gap opens at the correct density of 9 g cm À3 .…”

Section: Discussionmentioning

confidence: 99%

Structural instability and the metal–non-metal transition in expanded fluid metals

Tamura

Inui

Matsuda

et al. 2007

Journal of Non-Crystalline Solids

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X-ray diffraction, small angle X-ray scattering and inelastic X-ray scattering measurements for fluid Hg in the wide density range up to the supercritical region have been carried out using synchrotron radiation at SPring-8. We obtained the static and dynamic structure factors as a function of temperature, pressure and density. Based on the results we found that there exist medium-range fluctuations accompanying the metal-non-metal transition in fluid Hg. The scale of the fluctuations was about 10 A in space and sub-picoseconds in time. We discuss the possibility that such structural instability induces the metal-non-metal transition in expanded fluid Hg.

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“…Compared to these liquids, expanded fluid Hg is non-simple. In fact, inhomogeneous regime [11] or two-state model [12] were proposed to explain the electronical and thermodynamic properties of fluid Hg in the M-NM transition region. Fluctuations near the critical point may also play an essential role for the M-NM transition.…”

Section: Introductionmentioning

confidence: 99%

Observation of fast sound in metal–nonmetal transition in liquid Hg

Inui

Ishikawa

Matsuda

et al. 2005

Journal of Physics and Chemistry of Solids

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Liquid Hg undergoes the metal-nonmetal (M-NM) transition when it is expanded from 13.6 g cm-3 at ambient conditions to 9 g cm-3 at high temperature and high pressure. To investigate collective and single particle motions in expanded fluid Hg, we have made inelastic x-ray scattering experiments and obtained the dynamic structure factor, S(Q,ω), of fluid Hg. We analyzed S(Q,ω) within the framework of generalized hydrodynamics and found that the excitation energies of collective modes disperse three times as fast as the hydrodynamic sound velocity in the M-NM transition region at 9 gcm-3. The results indicate the existence of fast sound in expanded fluid Hg accompanying the metal-non-metal transition and strongly hint that fluctuations intrinsic to the M-NM transition are induced on atomic length scale and sub-picosecond time scale.

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A modified Van der Waals model for the coexistence curve of expanded metals

Cited by 28 publications

References 17 publications

Application of the embedded atom model to liquid metals: Liquid mercury

Application of the embedded atom model to liquid metals: Liquid mercury

Structural instability and the metal–non-metal transition in expanded fluid metals

Observation of fast sound in metal–nonmetal transition in liquid Hg

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