Phase Equilibria in the Ag-Ge-Bi-Te System and Thermodynamic Properties of the nGeTe•mBi2Te3 (n, m=1-4) Layered Compounds

of phases was performed in the part of PE that is in contact with SE of ECC at T = 580 K for 50 h. Silver cations that shift from the left to the right electrode acted as the nucleation centers of equilibrium compounds in the corresponding phase regions. Linear dependences E versus T of ECCs in the range of T = (440-500) K were used to calculate values of the Gibbs energies, enthalpies of formation, and entropies of compounds GeTe center dot 4Bi(2)Te(3), GeTe center dot 3Bi(2)Te(3), GeTe center dot 2.5Bi(2)Te(3), GeTe center dot 2Bi(2)Te(3), GeTe center dot Bi2Te3, 2GeTe center dot Bi2Te3, 3GeTe center dot Bi2Te3, and 4GeTe center dot Bi2Te3. The differences in the values of the thermodynamic functions of GeTe-rich and Bi2Te(3)-rich compounds with respect to GeTe center dot Bi2Te3 correlate well with the literature data on the differences of their crystal structures.

Automated summary

This study investigated the differences in the thermodynamic functions of GeTe-rich and Bi2Te(3)-rich compounds and found that these differences correlate with the differences in their crystal structures.