THERMODYNAMIC PROPERTIES OF COMPOUNDS Tl₆SCl₄ AND Tl₆SBr₄

Thermodynamic analysis of Tl–S–Hal(Hal–Cl,Br) systems in the Tl–TlHal–S composition area was made (at 300-390 K temperature range) by measurement of electromotive forces (EMF) of concentration chains of type:

(–) Tl (solid) / liquid electrolyte, Tl+ / (Tl–S–Hal) / (solid) (+). Earlier detected diagrams of solid phase equilibrium has been confirmed. Relative partial thermodynamic functions (ΔG, ΔH, ΔS)of thallium at 298 K calculated using the linear equations of temperature dependence of EMF for three phase areas TlCl–Tl₆SCl₄–Tl₄S₃ and TlBr–Tl₆SBr₄–TlS. Standard thermodynamic functions of formation and standard entropy of Tl₆SCl₄ and Tl₆SBr₄ compounds calculated.