Х-ray diffraction.

Based on thermodynamic constants, the concentration limits of the initial mercury and cadmium-containing salts and the pH range at which depositions of HgS and CdS are possible without the formation of HgO and Cd(OH)2 were calculated. The limits of the formation conditions of the Hg1–xCdxS solid solution in the thiosulfate-citrate-carbonate-thiourea system were defined by the overlap area between the constructed HgS and CdS deposition zones.

Based on thermodynamic constants, the concentration limits of the initial zinc-containing salt and the range of pH values at which the depositions of ZnS and ZnSe without Zn(OH)2 are possible were calculated. The boundary conditions of the formation of the ZnSxSe1–x solid solution in the hydroxide-hydrazine-thiourea-selenium system were defined by the overlap area between the constructed ZnS and ZnSe formation zones. The task of complex intermolecular interaction between complexed zinc ions and two chalcogenizers in the working solution was solved on the basis of mathematical calculations.