Excess enthalpies and phase equilibria in the Pb–Sb–Te system

Comprehensive thermodynamic description of the quasiternary system PbTe–GeTe–SnTe

“…These literature data for the liquid alloys are given for constant temperatures (1228 K for Sn-Pb-Te [4], 1153 K for Ge-Sn-Te [12] and 1210 K for Pb-Ge-Te [13]). To deduce the excess enthalpy for the melt of a quasibinary system (M 1−k N k )Te, the literature data for f H E of the ternary alloy M-N-Te were plotted depending on the Te atomic fraction for different values of k. An example of such a plot is shown in Fig.…”

“…3. The excess enthalpy of formation f H E (x Te ) from the elements X, Y and Z for the ternary melt [12].…”

Evolution of phase segregation and eutectic structures in AgPb18SbTe20

“…In a quasi‐ternary system such as PbTe–Ag 2 Te–Sb 2 Te 3 one could expect the chances and priority for the formation of tellurides must be driven by their thermodynamic stability especially with regard to Ag 2 Te and Sb 2 Te 3 in LAST‐18 system where they are present in equal amounts (each 5 mol.%). It was reported that the enthalpies of mixing in liquid phase, metal–tellurium alloys often vary as triangular‐shaped functions of the concentration with exothermic minima close to the composition of congruent melting compounds such as PbTe, Ag 2 Te and Sb 2 Te 3 in the Pb–Te, Ag–Te and Sb–Te systems, respectively . This behavior can be explained by the formation of stoichiometric associates in the liquid state due to electron transfer from the metal to the chalcogen or formation of covalent bonds between these elements suggesting strong interactions creating some sort of short‐range order in the liquid.…”