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An equilibrium mixture of monoclinic pyrrhotite and pyrite was synthesized in the eutectic AlCl 3 - KCl melt at 525 K. The reaction 7FeS 2 (cr) + 12Ag(cr) = 8Fe 0.875 S(cr) + 6Ag 2 S(cr) was studied by an electromotive force technique in an all-solid-state electrochemical cell with an Ag + -conductive solid electrolyte in Ar at atmospheric pressure: (-) Pt | Ag | AgI | Ag 2 S, Fe 0.875 S, FeS 2  | Pt (+). In the 490-565 K temperature range a linear electromotive force vs. temperature trend was obtained from which the temperature dependence of the sulfur fugacity was determined for the monoclinic pyrrhotitepyrite equilibrium: logf S2 (mpo+py) = 14.079 - 14406⋅T -1 , (500 &lt; T/K &lt; 565). In addition, standard thermodynamic functions were calculated for monoclinic pyrrhotite Fe 0.875 S at 298 K and atmospheric pressure: ΔG f (mpo, 298.15 K) = -(136 200 ± 3000) J/mol, S°(mpo, 298.15 K) = (66.7 ± 1.3) J/(mol-K), ΔH f (mpo, 298.15 K) = -(157 400 ± 3000) J/mol. Gaseous sulfur, S 2 -ideal gas at 1 bar (10 5  Pa) pressure- was taken as a standard state for sulfur.

Thermodynamic study of monoclinic pyrrhotite in equilibrium with pyrite in the Ag-Fe-S system by solid-state electrochemical cell technique