Thermodynamic properties of krennerite (AgAu3Te8) and silvanite (AgAuTe4): experimental determination by the EMF method

Авторы: Brichkina E.A., Voronin M.V., Osadchiy E.G.
Журнал: Experiment in GeoSciences
Том: 29
Номер: 1
Год издания: 2023
Первая страница: 49
Последняя страница: 50
Аннотация: The thermodynamic properties of reactionsinvolving krennerite (AgAu3Te8) and sylvanite (AgAuTe4)were determined by measuring electromotive forces (EMF) using a solid electrolyte Ag4RbI5 ( up to 500 K) in the AgAu-Te system in the temperature range 332K - 485K. Thedependences E(T) were obtained in all-solid-stateelectrochemical cells with a common gas space inaccordance with the following reactions:Ag + 2Te + 3AuTe2 = AgAu3Te83Ag+4Te+AgAu3Te8=3AgAuTe4Using the reference data, the standard (298.15 K, 1 bar (105Pa)) thermodynamic properties (ΔfG0, ΔS0, ΔfH0) of krennerite and sylvanite formation from the elements were calculated: ΔfG0(AgAu3Te8)= -78.11 kJ·mol-1;S0(AgAu3Te8) = 580.6 J·mol-1·K-1; ΔfH0(AgAu3Te8) = -78.26 kJ·mol-1 and sylvanite: ΔfG0(AgAuTe4) = -51.22 kJ·mol-1;S0(AgAuTe4)=326.59 J·mol-1·K-1; ΔfH0(AgAuTe4) = -79.83 kJ·mol-1.Keywords: sylvanite, AgAuTe4, krennerite, AgAu4Te10,AgAu3Te8, electromotive force method, Ag-Au-Te system.
Добавил в систему: Бричкина Екатерина Александровна

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