CsCu4S3 und CsCu3S2: Sulfide mit tetraedrisch und linear koordiniertem Kupfer

Thermodynamics of the System Si? Cl? H By static and dynamic methods the equilibria 4SiHCl₃,g = 3SiHCl₄,g + Si,s + 2H₂,g (1) between 800 and 1140 K and SiCl₄,g + H₂,g = SiHCl₃,g + HCl,g (2) between 1170 and 1450 K were investigated. The expression for the temperature dependence of the equilibria were found to be lg Kp [Torr] = (5.688–1520/T) ± 0.32 (1) and lg Kp = (1.38/3250/T) ± 0.16 (2). The values measured for reaction pressures and equilibrium constants lead to the conclusion, that the difference of enthalpies of formation of SiCl₄ and SiHCl₃ found in literature is nessecarily to be corrected by 5–6 kcal/mole. With ΔH(SiCl₄,g) = ?157.1 kcal/mole the equilibrium measurements lead to the enthalpy of formation for SiHCl₃,g of ΔH(SiHCl₃,g) = ?118.2 kcal/mole.