Abstract
The thermodynamic activities of the components of PbO–PbF2 melts were determined by means of the following cell:
Pt/Ni+NiO/ZrO2(CaO)/Pb+(PbO+PbF2)/Ir−Pt.
The activities of PbO and PbF2 showed negative deviations from the Raoult law and were in fairly good agreement with Temkin’s model. The enthalpies of mixing of this system would arise from the polarizabilities of the Pb2+ ions surrounded by the O2− and F− ions of different sizes.
