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Determination of standard thermodynamic properties of sulfides in the Ag-Au-S system by means of a solid-state galvanic cell

Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow District 142432, Russia

Correspondence: ^* E-mail: euo{at}iem.ac.ru

Thermodynamic properties of the following phase reactions in the Ag-Au-S system have been investigated via electromotive force (EMF) measurements in solid-state galvanic cells with Ag₄RbI₅ as a solid electrolyte:

The EMF temperature dependences observed for these reactions, together with auxiliary thermodynamic properties for Ag₂S, acanthite, from Robie and Hemingway (1995), result in the following standard thermodynamic properties at 298.15 K and 1 bar (10⁵ Pa): _fG^o(Ag₃AuS₂, cr) = –69478(200) J/mol and S^o(Ag₃AuS₂, cr) = 273.37(56) J/(mol·K) (uytenbogaardtite), _fG^o (AgAuS, cr) = –27621(210) J/mol and S^o(AgAuS, cr) = 128.11(60) J/( mol·K) (petrovskaite), and _fG^o (Au₂S, cr) = 1077(650) J/mol and S^o(Au₂S, cr) = 128.1(2.0) J/( mol·K). Au₂S(cr) is a thermodynamically metastable phase, but the values of its thermodynamic functions are open to discussion.

This article has been cited by other articles:

				E. G. Osadchii and E. A. Echmaeva The system Ag-Au-Se: Phase relations below 405 K and determination of standard thermodynamic properties of selenides by solid-state galvanic cell technique American Mineralogist, April 1, 2007; 92(4): 640 - 647. [Abstract] [Full Text] [PDF]