Calculating the boundary conditions of the formation of solid-phase metal sulfides and selenides by deposition with thio- and selenourea

Calculation equations that allow one to determine the boundary conditions of the formation of solid-phase metal sulfides and selenides with different valences according to the decomposition constants of thio- and selenourea and the kinetic dependence of the accumulation of chalcogenide ions in the reaction system are proposed. The contribution from the crystallization factor to the determination of the boundary conditions of the formation of the solid phase is shown with allowance for the nucleation of metal chalcogenide. The calculation equations determining the boundary conditions of the formation of the main admixture phases upon the hydrochemical deposition of chalcogenides, metal hydroxide, and cyanamide are derived.