Equations of State and the Phase Diagram of Dielectric and Metallic Helium-4
| Autor: | V. D. Urlin |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Equation of state
Materials science Solid-state physics General Physics and Astronomy Thermodynamics chemistry.chemical_element Dielectric 01 natural sciences 010305 fluids & plasmas Condensed Matter::Materials Science Helium-4 chemistry Electrical resistivity and conductivity Phase (matter) 0103 physical sciences Physics::Atomic and Molecular Clusters 010306 general physics Helium Phase diagram |
| Zdroj: | Journal of Experimental and Theoretical Physics. 127:121-130 |
| ISSN: | 1090-6509 1063-7761 |
| Popis: | A new form of the semiempirical equation of state for the liquid phase of helium-4 is proposed that is based on the assumption that the structure of this phase consists of a mixture of dielectric and metallic components. It is postulated that solid dielectric helium with density higher than 5.3 g/cm3 becomes a metal. The values of the parameters of the equations of state for both solid phases and the liquid phase of helium are calculated. The unknown values of the initial data for helium are taken by analogy with the parameters for deuterium. The phase diagram, shock adiabat, isentropes, isotherms, and electrical conductivity in these processes are calculated with the use of the equations of state of solid and liquid phases of helium-4. The results of calculation are compared with experimental data in the range of pressures of up to 35 GPa for an isotherm, up to 150 GPa for a shock adiabat, up to 42 GPa for the melting curve, and up to 2000 GPa for isentropes, and showed quite satisfactory agreement. Numerical extrapolation of the melting curve is performed to a range of ultrahigh pressures of up to 8000 GPa. |
| Databáze: | OpenAIRE |
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