A Thermodynamic Study of Liquid Tin-Silver Alloys by means of Solid-Oxide Galvanic Cell

Abstract

The electrochemical technique involving solid-oxide electrolyte has been used for the determination of the thermodynamic properties of SnO2 and the activities of Sn in liquid Ag–Sn alloys at 1023 to 1273 K. The standard Gibbs energy of formation of SnO2(c) is given byΔGf°(SnO2,c)⁄kKmol−1=−578.8+0.2088(T/K)±0.8.The third-law analysis was applied to the results for the standard Gibbs energy of formation of SnO2. The activities of Sn and Ag at 1023 and 1173 K were determined as a function of alloy composition.