Thermodynamic R-diagrams reveal solid-like fluid states

2014/11/11 by Ruppeiner, George, Mausbach, Peter, May, Helge-Otmar · 2 citations
#FOS: Physical sciences #Soft Condensed Matter (cond-mat.soft) #Statistical Mechanics (cond-mat.stat-mech)

paper · doi:10.48550/arxiv.1411.2872

Abstract

We evaluate the thermodynamic curvature R for fluid argon, hydrogen, carbon dioxide, and water. For these fluids, R is mostly negative, but we also find significant regimes of positive R, which we interpret as indicating solid-like fluid properties. Regimes of positive R are present in all four fluids at very high pressure. Water has, in addition, a narrow slab of positive R in the stable liquid phase near its triple point. Also, water is the only fluid we found having R decrease on cooling into the metastable liquid phase, consistent with a possible second critical point.

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