Abstract

The subject matter of this work was the triangulation of the Mn₂O₃–ZnO–SiO₂, Mn₃O₄–ZnO–SiO₂, and MnO–ZnO–SiO₂ systems and the determination of phase transformations to yield Zn_{2 – 2х}Mn_2хSiO₄ solid solution. Equilibrium phase diagrams have been plotted taking into account the existence temperatures of each of the manganese oxides, phase compositions of the constituent binary systems, and checkup points, whose phase compositions helped us to determine the positions of secondary triangles. The phase compositions of reaction products of the terminal oxides and the phase transformation sequence during Zn_{2 – 2х}Mn_2хSiO₄ synthesis were monitored by X-ray powder diffraction and thermal analysis. Phase ratios in the MnO_х–ZnO–SiO₂ system are caused by the charge states of manganese ions changing in response to rising temperature. The triangulation of the Mn₂O₃–ZnO–SiO₂ system at 800°С is determined by the ZnMn₂O₄–Zn₂SiO₄ tie-line and partitions the system to the ZnO–Zn₂SiO₄–ZnMn₂O₄, Zn₂SiO₄–ZnMn₂O₄–SiO₂, and ZnMn₂O₄–SiO₂–Mn₂O₃ simplex triangles. The Zn_{2 – 2х}Mn_2хSiO₄ solid solution with an extent limited to Zn_1.6Mn_0.4SiO₄ is formed at temperatures above 1000°С. The triangulation of the MnO–ZnO–SiO₂ ternary system is determined by the Zn_1.6Mn_0.4SiO₄–ZnO–MnSiO₃ simplex triangle.

中文翻译：

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Mn2O3–ZnO–SiO2、Mn3О4–ZnO–SiO2 和 MnO–ZnO–SiO2 体系中的相平衡和化学反应

摘要

这项工作的主题是 Mn ₂ O ₃ –ZnO–SiO ₂、Mn ₃ O ₄ –ZnO–SiO ₂和 MnO–ZnO–SiO ₂体系的三角测量以及相变的测定，以产生 Zn _{2 – 2 х} Mn _{2 х} SiO ₄固溶体。考虑到每种锰氧化物的存在温度、组成二元系统的相组成和检查点，绘制了平衡相图，其相组成帮助我们确定了二次三角形的位置。通过X射线粉末衍射和热分析监测了Zn _{2 – 2 х} Mn _{2 х} SiO ₄合成过程中末端氧化物反应产物的相组成和相变顺序。MnO _х –ZnO–SiO ₂体系中的相比是由锰离子的电荷态随温度升高而变化引起的。800°С 下Mn ₂ O ₃ –ZnO–SiO _{2体系的三角剖分由 ZnMn 2} O ₄ –Zn ₂ SiO ₄连接线确定，并将体系划分为 ZnO–Zn ₂ SiO ₄ –ZnMn ₂ O_如图4所示，Zn ₂ SiO ₄ –ZnMn ₂ O ₄ –SiO ₂和ZnMn ₂ O ₄ –SiO ₂ –Mn ₂ O ₃单纯形三角形。Zn _{2 – 2 х} Mn _{2 х} SiO ₄固溶体（其程度仅限于 Zn _1.6 Mn _0.4 SiO _{4 ）}在高于 1000°С 的温度下形成。MnO-ZnO-SiO _{2三元体系的三角剖分由Zn 1.6} Mn _0.4 SiO ₄ –ZnO-MnSiO ₃单纯形三角形确定。