EXPERIMENTAL-EVIDENCE FOR A DEMIXING PHENOMENON IN THE LIQUID-STATE AROUND THE BINARY COMPOUND COSI2

For the first time, a demixing phenomenon is observed in a liquid bina ry metal-silicon system. Combined results from high-temperature differ ential thermal analysis and adiabatic calorimetry allow a determinatio n of the enthalpy of phase transformation and the heat capacities in t he solid and liquid states; furthermore, the equilibrium phase diagram around the ordered CoSi2 compound is corrected. The maximum of the li quidus curve lies only 8 K above the invariant transformation of the c rystalline CoSi2 into two immiscible liquids.