| Abstract: | The Cu-Tl-Ge system has been studied by DTA and powder X-ray diffraction. Several polythermal sections, the isothermal section
at 400 K, and the liquidus surface projection have been constructed for the phase diagram of this system. Primary phase fields
and the types and coordinates of invariant and monovariant equilibria have been determined. An immiscibility region of the
Cu-Tl binary subsystem considerably (up to 60 at % Ge) protrudes into the triangular diagram and crosses peritectic and eutectic
curves that originate from the Cu-Ge subsystem. This gives rise to a number of four-phase monotectic equilibria in the ternary
system. Crystallization ends with peritectic equilibrium and eutectic equilibria, which are all degenerate in the vicinity
of thallium. Intermediate ternary phases are not formed in the system. Solubilities in the initial components and in binary
phases of the Cu-Ge system do not exceed 0.5 at %. |
