Triple immiscibility in the Pb(+Ru)–Zn(+Sn) system

During the use of new technology, the formation of a third intermediate layer in the Pb(+Ru)–Zn(+Sn) system is observed in a binary immiscibility gap system. This layer contains all the components of the systems and presumably consists of the mixture of triple eutectic Pb–Sn–Zn with three double eutectics (Pb–Zn, Pb–Sn, and Sn–Zn). It is located between the initial Pb and Zn layers. Its edges from the sides of both Pb and Zn contain RuZn$_{13}$ crystals formed within the system, which are confined to narrow regions of pure Zn.