The existence of the only ternary compound, Ag3AuSe2 (fischesserite), in the Ag-Au-Se system was confirmed by solid-state annealing method. The selenium analog of petrovskaite (AgAuS) was not observed under the experimental conditions (in the temperature range of 350–773 K and own vapor pressure).
The solid-state reactions
were studied by the electromotive force (EMF) technique in all solid-state galvanic cells with Ag4RbI5 as a solid electrolyte. The experiments were run in a dry argon gas flow at atmospheric pressure.
The following standard thermodynamic properties of the stable phases were determined at 298.15 K and 1 bar (105 Pa):