Abstract

Structures and phase relations in the ZnSCdS system were investigated in the temperature range 150–700°C and the boundaries describing the equilibria between the zinc-blende and wurtzite Cd xZn 1−xS solid solutions were determined by examining the ion exchange processes Cd 2+ → Zn 2+ in the ZnS powder. The complete thermodynamical description of the ZnSCdS system is proposed. It was found, that Cd xZn 1−xS solid solutions of both modifications obey a regular solution model. Enthalpies of the zinc-blende-to-wurtzite structural phase transition in CdS (550±50 J/mol) and in ZnS (1700±100 J/mol) were defined. The solid-state phase diagram calculated from defined thermodynamical parameters agrees well with the experimental data.

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