Abstract
Based on literature data, with the additional calculations are selected most reliable data for the thermodynamic parameters of crystal silver selenide, germanium and silver selenogermanate: 0 298 H D (a-Ag2Se)= −43.5, 0 298 H D (GeSe,cr)=−82.9, 0 298 H D (GeSe2,cr)=−103.7, 0 298 H D (a- Ag8GeSe6,cr)=−290.4, 0 298 G D (a-Ag2Se)=−50.3, 0 298 G D (GeSe, cr)=−84.2, 0 298 G D (GeSe2,cr)= −103.1, 0 298 G D (a-Ag8GeSe6,cr)=−306.3 kJ·mol−1, 0 298 S (a-Ag2Se)=150.3, 0 298 S (GeSe,cr)=78.3, 0 298 S (GeSe2, cr)=112.6, 0 298 S (a-Ag8GeSe6, cr)=711.6 J·mol−1.К-1, ,298 p C =377.1 J·mol−1.К-1. It was revealed that the compound Ag2GeSe3 is formed in the amorphous state, unstable and decomposed into the Ag8GeSe6 and GeSe2 compounds. The applicability of the Debye method based on quantum concepts of atomic oscillations in the crystal lattice of a solid in the Magnus-Lindemann and Eastmen-Tsagareishvili approximations for calculating the heat capacity and entropy of a ternary compound with a common chalcogenide anion is revealed.