Wetting and Prewetting Transitions in a Pure Metallic Fluid

Details Wetting and Prewetting Transitions in a Pure Metallic Fluid Wetting and Prewetting Transitions in a Pure Metallic Fluid

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..4cs..a305k&link_type=abstract

American Physical Society, Four Corners Section Meeting, 3-4 April 1998 Albuquerque, New Mexico, abstract #A3.05

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The paper summarizes results of an acoustical study of sub- and supercritical mercury fluid. Sound velocity, and transmitted and reflected signal amplitudes have been measured at 10 MHz with metallic (Mo and Nb) cells at temperatures up to 2100 K and pressures up to 1900 bar. It was shown that a first order phase transition revealed in mercury vapor [1] is a prewetting transition [2]. It turned out to be unexpectedly strong and notably different from that in dielectric liquids. The prewetting transition curve meets tangentially the saturation line at a wetting transition point located at about 1250 K, and terminates by a prewetting critical points lying well above the bulk point. Parameters of the bulk critical point (1764 K, 1670 bar) were also measured. Another specific feature of the prewetting transition in mercury on metallic substrates is a strong hysteresis increasing at approaching the wetting transition point. A new phase diagram of mercury casts new light on the interpretation of various features seen in earlier experiments on mercury both in the vapor phase and near-critical region, including thermopower anomalies first noticed over two decades ago. [1] V.F. Kozhevnikov, D.I. Arnold and S.P. Naurzakov, J. Phys.: Condens Matter 6, A249 (1994) [2] V. Kozhevnikov, D. Arnold, S. Naurzakov, and M.E. Fisher, Phys. Rev. Lett. 78, 1735 (1997)

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