Determination of the critical point of gold

Konstantinos Boboridis, Gernot Pottlacher, Helmut Jäger

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Wire-shaped gold specimens are placed in a new, improved high-pressure vessel, which is part of a fast capacitor-discharge circuit and in which static pressures above 600 MPa can be reached with distilled water as the pressure-transmitting medium. The specimens are self-heated resistively by a current pulse. The current through the specimen, the voltage drop across it, and its temperature are recorded as a function of time with submicrosecond resolution. The radial expansion of the specimen is determined with a CCD camera. Experiments are performed at different pressures. When the critical pressure is exceeded, there is no liquid-gas phase transition; hence, no sudden change in the thermal expansion rate is observed. The results for temperature, pressure, and specific volume at the critical point of gold are as follows: Tc = 7400±1100 K, pc = 530±20 MPa, and vc = 0.13±0.03×10-3 m3·kg-1.

Original languageEnglish
Pages (from-to)1289-1297
Number of pages9
JournalInternational Journal of Thermophysics
Volume20
Issue number4
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Condensed Matter Physics

Fields of Expertise

  • Advanced Materials Science

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