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Abstract <p>Substitutional solid solutions Zn<sub>2–2<i>x</i></sub>Ni<sub>2<i>x</i></sub>SiO<sub>4</sub> (willemite structure), Ni<sub>2–2<i>y</i></sub>Zn<sub>2<i>y</i></sub>SiO<sub>4</sub> (olivine structure), and Ni<sub>1–<i>z</i></sub>Zn<sub><i>z</i></sub>O (rock salt structure) were prepared by solid-phase synthesis in air, and their extents were determined. Subsolidus phase equilibria in the NiO–ZnO–SiO<sub>2</sub> system were elucidated based on the phase compositions of the NiO–ZnO, ZnO–SiO<sub>2</sub>, and NiO–SiO<sub>2</sub> binary systems, reference points, and the unit cell parameters of solid solutions. The NiO–ZnO–SiO<sub>2</sub> ternary system was partitioned by tie-lines into seven simplex fields. Phase equilibria in the NiO–ZnO–SiO<sub>2</sub> system are determined by quasi-binary equilibrium between the end-members of Zn<sub>2–2<i>x</i></sub>Ni<sub>2<i>x</i></sub>SiO<sub>4</sub> (<i>x</i> = 0.10) and Ni<sub>2–2<i>y</i></sub>Zn<sub>2<i>y</i></sub>SiO<sub>4</sub> (<i>y</i> = 0.25) solid solutions and the tie-lines connecting these end-members with the Ni<sub>0.83</sub>Zn<sub>0.17</sub>O solid solution, as well as by the tie-line connecting the Ni<sub>1–<i>z</i></sub>Zn<sub><i>z</i></sub>O (<i>z</i> = 0.4) solid solution end-member with Zn<sub>2</sub>SiO<sub>4</sub>.</p>

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

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • E. S. Dobrynenko,
  • N. A. Zaitseva,
  • R. F. Samigullina,
  • T. I. Krasnenko

摘要

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.