Energetics and Stabilities of the IIB/VIA‐Compounds at High‐Temperature Equilibrium Conditions

Equilibrium vaporization behaviour of twelve IIB/VIA‐compounds of the type MeX was studied by means of high‐temperature mass spectrometry. In all cases except HgTe the existence of stable MeX(g)‐molecules was established. Bond energies D 0 (MeX gas ) were determined by the thermodynamic third‐law method and range as follows: ZnO(g) (280.1 kJ/mol)/ZnS(g) (224.8)/ZnSe(g) (170.8)/ZnTe(g) (117.7)/CdO(g) (230.3)/CdS(g) (208.5)/CdSe(g) (127.7)/CdTe(g) (100.1)/HgO(g) (221.1)/HgS(g) (217.3)/HgSe(g) (144.5). ‐ Comparison of the third‐law bond energies with existing experimental data, upper limits of D 0 given by other authors, and semi‐empirical estimates shows basic agreement. Data for the heat of dissociative vaporization Δ H 0 R , the heat of atomization Δ H 0 at , the parameter magnified image , and the chemical stabilities of the IIB/VIA‐systems are also presented.