Liquid carbon density and resistivity

Savvatimskiy, A. I.

doi:10.1088/0953-8984/20/11/114112

Cited by 22 publications

(6 citation statements)

References 12 publications

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“…[16] is more tetrahedral than C*, the potential with λ = 26.2 of the family of this study, and produces a very low-density liquid (about half of the density of the crystal) in qualitative agreement with the experiments that indicate that the density of liquid carbon is even lower, about one third of the density of diamond. [79] Most noteworthy in Figure 1 is the lack of density anomaly for both low and high values of tetrahedral parameter λ. The density anomaly, a density maximum followed by a density minimum at lower temperatures, is only observed for the liquids with tetrahedral parameter in the range 20 < λ < 26.4.…”

Section: Densitymentioning

confidence: 92%

The Rise and Fall of Anomalies in Tetrahedral Liquids

et al. 2011

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Abstract. The thermodynamic liquid-state anomalies and associated structural changes of the Stillinger-Weber family of liquids are mapped out as a function of the degree of tetrahedrality of the interaction potential, focusing in particular on tetrahedrality values suitable for modeling C, H2O, Si, Ge and Sn. We show that the density anomaly, associated with a rise in molar volume on isobaric cooling, emerges at intermediate tetrahedralities (e.g. Ge, Si and H2O) but is absent in the low (e.g. Sn) and high (e.g. C) tetrahedrality liquids. The rise in entropy on isothermal compression associated with the density anomaly is related to the structural changes in the liquid using the pair correlation entropy. An anomalous increase in the heat capacity on isobaric cooling exists at high tetrahedralities but is absent at low tetrahedralities (e.g. Sn). Structurally, this heat capacity anomaly originates in a sharp rise in the fraction of four-coordinated particles and local tetrahedral order in the liquid as its structure approaches that of the tetrahedral crystal.

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Section: Densitymentioning

confidence: 92%

The Rise and Fall of Anomalies in Tetrahedral Liquids

et al. 2011

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“…Our results on carbon expansion obtained in sapphire capillary tubes (and between sapphire plates) at the melting line are shown in the Table 1 [3,4]. Togaya [5] obtained linear dependence between rising pressure P and diminishing of the imparted energy E M at the finish of melting.…”

Section: Data On the Liquid Carbon Propertiesmentioning

confidence: 60%

Liquid metals and liquid carbon: some similar properties at high temperatures

Фортов

Korobenko

Savvatimskiy

2011

EPJ Web of Conferences

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Abstract.Liquid carbon resistivity ρ (just after the melting) diminishes with rising of input energy and pressure P (for P -lower than 50 kbar). Far above melting point, at high pressure (higher ∼ 50 kbar) liquid carbon resistivity rises sharply, up to 3000 µΩ⋅cm. It was shown that the liquid carbon (as some other metals, for example W, Li) has one and the same property: a denser phase (in liquid state) has higher resistivity.

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“…2) suggest as probable. If we also take into consideration the significant differences between the densities of melted carbon (~1.2 -1.8 mg/cm 3 ) [45] and graphite (2 -2.2 mg/cm 3 ) a local melting process will try to produce a 'local' increase of several tens of percent of the materials' volume inducing significant pressures over graphite solid boundaries. As some studies have shown, the graphite could be significantly compressed (up to 75 % [46]) but with great 'costs' in the crystal structure.…”

Section: Resultsmentioning

confidence: 99%