Water and gallium at absolute negative pressures. Loci of maximum density and of melting

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Abstract

Several physical properties of liquids as well as those of the coexistence between liquid and solid can be determined at absolute negative pressures. Examples for this include thermal pressure coefficients, loci of temperature of maximum density, melting lines, speed of propagation of low-intensity sound waves, and (p, T, x) conditions of occurrence of liquid/liquid phase separation. Three model temperature-pressure cycles, which allow for the measurement of temperature-pressure conditions of the occurrence of maxima of liquid density, negatively sloped fusion lines, and the upper critical solution temperature (UCST) of liquid solutions in these metastable regimes are described. A new apparatus for measuring negative pressures was developed. The temperature and pressure are determined within an uncertainty of ±0.05°C and ±5 bar, respectively. Water and heavy water have been used as testing systems with respect to the location of their temperatures of maximum density (TMD) loci. Empirical equations of state whose parameters have been fitted to experimental data located in the normal positive pressure region have proven to extrapolate well to the negative pressure regime. Furthermore, an attempt was made to use SAFT in order to provide a more theoretically founded framework. Preliminary results for gallium have shown that a TMD exists 45 K inside the supercooled regime, and that the continuation of its melting line down to -80 bar evolves with a slope of -515 ±25 bar·K-1.

Original languageEnglish
Pages (from-to)1159-1174
Number of pages16
JournalInternational Journal of Thermophysics
Volume22
Issue number4
DOIs
Publication statusPublished - 1 Jul 2001
Event14th Symposium on Thermophysical Properties - Boulder, United States
Duration: 25 Jun 200030 Jun 2000

Keywords

  • Gallium
  • Liquids under tension
  • Maximum density loci
  • Melting line
  • Metastability
  • Negative pressures
  • Water

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