Mixing enthalpies in binary Ce-Sb and ternary Ce-Co-Sb liquid alloys

The enthalpies of mixing in liquid alloys in the binary Ce-Sb and ternary Ce-Co-Sb systems were determined over a wide range of composition by means of isoperibolic calorimetry in the temperature range 1 600-1 723 K. The minimum value of the integral enthalpy of mixing (Δ H min ) in the Ce-Sb system was evaluated to be −123 kJ mol -1 at x Ce = 0.55. The enthalpies of mixing in liquid ternary alloys were found to increase smoothly from the binary boundary systems Co-Ce and Co-Sb towards the Ce-Sb system reaching the value of approximately −123 kJ mol -1 in the vicinity of the phase CeSb.