Thermodynamics of the CsCl-H2O system at low temperatures
Monnin, Christophe; Dubois, Michel
European Journal of Mineralogy Volume 11 Number 3 (1999), p. 477 - 482
published: May 25, 1999
manuscript accepted: Feb 2, 1999
manuscript received: Jul 6, 1998
ArtNo. ESP147051103002, Price: 29.00 €
Abstract The interpretation of fluid-inclusion data requires knowledge of phase diagrams at low (subfreezing) temperatures. From the example of the CsCl-H2O system, we here investigate the possibility to build such diagrams from thermodynamic models of aqueous solutions parameterized at higher temperatures. Holmes & Mesmer (1983) have built a model for the thermodynamic properties of CsCl(aq) based on Pitzer’s equation fit to thermodynamic data mainly at temperatures above O°C along with a few freezing-point-depression data down to -8°C. We show how this model can be used along with the published water-ice equilibrium constant and thermodynamic data at 25 °C for Cs+(aq), Cl-(aq) and CsCl(s), to predict with confidence the ice-liquid-vapor (ILV) and the salt-liquid-vapor (SLV) curves down to the eutectic temperature for the CsCl-H2O system.