The results of thermodynamic investigation and characterisation of alloys in the Sb-PbBieut section in ternary Pb-Bi-Sb system are presented in this paper. Experimental calorimetric investigations were done according to Oelsen's method, while general solution model was applied for thermodynamic predicting. Activities, activity coefficients, partial molar quantities for antimony and integral molar quantities were obtained at temperature of 873 and 973 K. Also, characterisation of the obtained alloys was done according of DTA and optic microscopy.