What question did this study set out to answer?

The main aim is to understand the solid solutions and phase equilibria in the NiO–ZnO–SiO2 system.

March 1, 2026

Solid Solutions and Subsolidus Phase Equilibria in the NiO–ZnO–SiO2 System

EDE. S. DobrynenkoInstitute of Solid State Chemistry NZN. A. ZaitsevaInstitute of Solid State Chemistry RSR. F. SamigullinaInstitute of Solid State Chemistry

Key Points

The main aim is to understand the solid solutions and phase equilibria in the NiO–ZnO–SiO2 system.
Prepared solid solutions by solid-phase synthesis in air.
Determined the extents of the solid solutions.
Elucidated the subsolidus phase equilibria based on phase compositions of binary systems.
Partitioned the ternary system using tie-lines.
Identified seven simplex fields in the NiO–ZnO–SiO2 system.
Defined quasi-binary equilibrium between distinct solid solution end-members.
Established key tie-lines connecting solid solution compositions.

Abstract

Substitutional solid solutions Zn2–2xNi2xSiO4 (willemite structure), Ni2–2yZn2ySiO4 (olivine structure), and Ni1–zZnzO (rock salt structure) were prepared by solid-phase synthesis in air, and their extents were determined. Subsolidus phase equilibria in the NiO–ZnO–SiO2 system were elucidated based on the phase compositions of the NiO–ZnO, ZnO–SiO2, and NiO–SiO2 binary systems, reference points, and the unit cell parameters of solid solutions. The NiO–ZnO–SiO2 ternary system was partitioned by tie-lines into seven simplex fields. Phase equilibria in the NiO–ZnO–SiO2 system are determined by quasi-binary equilibrium between the end-members of Zn2–2xNi2xSiO4 (x = 0.10) and Ni2–2yZn2ySiO4 (y = 0.25) solid solutions and the tie-lines connecting these end-members with the Ni0.83Zn0.17O solid solution, as well as by the tie-line connecting the Ni1–zZnzO (z = 0.4) solid solution end-member with Zn2SiO4.

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