Preparation of ZnGa2S4 by Reacting GaI3 and ZnI2 with Sulfur

摘要

We have carried out thermodynamic modeling of the GaI3-S and ZnI2-S systems by the method of equilibrium constants and calculated the chemical compositions of the condensed and vapor phases in the temperature range 200-500 degrees C. Our experimental data demonstrate the feasibility of preparing zinc thiogallate by reacting gallium(III) iodide and zinc(II) iodide with sulfur. Synthesis was carried out at a temperature of 450 degrees C over a period 2 h, followed by calcination of the product at 650 degrees C in order to remove the residual iodine. The practical ZnGa2S4 yield was 92-94%.