Molecular alloys in the series of para-disubstituted benzene derivatives. Part VII. The para-dibromobenzene + para-bromoiodobenzene and para-chloroiodobenzene + para-bromoiodobenzene systems

The solid-liquid phase diagrams of the systems para-dibromobenzene + parabromoiodobenzene and para-chloroiodobenzene + para-bromoiodobenzene are presented. In the case of the first system there is solid state miscibility in all proportions and the phase diagram has a minimum. The second system has a solid-liquid loop without extremum and at lower temperature a region of demixing. The crystalline parameters of the molecular alloys have been determined as a function of composition