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. Samples of the Hg1–xCdxS films were deposited within the calculated area of their formation, which was confirmed by X-ray diffraction and elemental analysis.
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