Substitution solid solutions ZnNiSiO (willemite structure), NiZnSiO (olivine structure) and NiZnO (rock salt structure) were synthesized by solid-phase synthesis in air, and their extents were determined. Phase equilibria in the NiO-ZnO-SiO system in the subsolidus region were revealed based on the phase composition of the binary systems NiO-ZnO, ZnO-SiO, NiO-SiO, control points and parameters of the unit cells of solid solutions. It has been established that the ternary system NiO-ZnO-SiO is divided by conodes into seven elementary fields. Phase equilibria in the NiO-ZnO-SiO system is determined by the quasi-binary equilibrium of the boundary compositions of the ZnNiSiO (x = 0.10) and NiZnSiO (y = 0.25) solid solutions and the conodes connecting these compositions with the NiZnO solid solution, as well as the conode connecting the boundary composition of the NiZnO (z = 0.4) solid solution with ZnSiO.
E. S. Dobrynenko (Wed,) studied this question.