Comparison of thermodynamic data of the ternary Cu–Sn–Zn system, measured with the EMF and with the calorimetric method

Abstract

Abstract The enthalpy of mixing of the ternary Cu –Sn–Zn system was measured using a Calvet-type calorimeter. The investigations were carried out along the three cross sections Cu : Sn = 1 : 2, 1 : 1, and 2 : 1. Zn was added in the concentration range between 0 and 50 at.%. The calorimetric results were compared with EMF data investigated in an earlier work by Peng and Mikula [1]. The results of the calorimetric measurements show very good agreement in the copper-rich region, compared with the EMF measurements, but in the Cu : Sn = 1 : 2 cross section the results do not fit perfectly. The difference between both measuring methods was at the most ΔH = 300 J/mol at the cross section Cu : Sn = 1 : 1 and ΔH = 150 J/mol at the Cu : Sn = 2 : 1 cross section.