Investigation of Phase Equilibria on LiCl-KCl-GdCl3 Ternary System

IF 1.5 4区材料科学 Q4 CHEMISTRY, PHYSICAL

Journal of Phase Equilibria and Diffusion Pub Date : 2023-12-03 DOI:10.1007/s11669-023-01065-9

Sajal Ghosh, C. V. Vishnu Vardhan, T. Muthu Ambika, Dasarath Maji, Rajesh Ganesan

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Abstract

The LiCl-KCl-GdCl₃ quasi-ternary phase diagram has been investigated by differential thermal analysis (DTA) and x-ray diffraction (XRD) techniques. These experiments showed that the LiCl-KCl-GdCl₃ system consists of several pseudo-ternary and quasi-ternary composition triangles. Coexisting phases in the solid state at 260 °C were characterised by XRD analysis of the equilibrated samples. Quasi-ternary compounds were not found. The ternary eutectic temperature was observed at 315 ± 2 °C and its composition was delineated at 57 mol.% LiCl-42 mol.% KCl-1 mol.% GdCl₃ in the LiCl-KCl-K₃GdCl₆ composition triangle. The other ternary eutectic temperature was observed at 308 ± 2 °C in the LiCl-K₃GdCl₆-K₂GdCl₅ composition triangle. Its composition was deduced at 40.2 mol.% LiCl-41.7 mol.% KCl18.1 mol.% GdCl₃. Another ternary eutectic temperature was observed at 360 ± 9 °C in the LiCl-K₂GdCl₅-KGd₂Cl₇ composition triangle. Its composition was deduced at 33.8 mol.% LiCl-29.5 mol.% KCl-36.7 mol.% GdCl₃. The fourth ternary eutectic temperature was observed at 362 ± 4 °C in the LiCl-KGd₂Cl₇-LiGdCl₄ composition triangle. Its composition was delineated at 48 mol.% LiCl-11 mol.% KCl-41 mol.% GdCl₃. The ternary pseudo-peritectic reaction “L+GdCl₃ ↔ LiGdCl₄+KGd₂Cl₇” was observed at 370 ± 3 °C. Its composition was delineated at 46.7 mol.% LiCl-10.5 mol.% KCl-42.8 mol.% GdCl₃. The primary and secondary crystallisation temperatures, as well as polymorphic phase transformation temperatures of the samples were deduced from the heating runs of DTA experiments. Further, phases responsible for the various thermal events were ascertained. Isothermal composition triangles at selected temperatures, Scheil diagram and the polythermal liquidus projection with isothermal contours of the ternary phase field were drawn.

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LiCl-KCl-GdCl3 三元体系的相平衡研究

通过差热分析（DTA）和 X 射线衍射（XRD）技术研究了 LiCl-KCl-GdCl3 准三元相图。这些实验表明，LiCl-KCl-GdCl3 体系由多个伪三元和准三元三角形组成。通过对平衡样品进行 XRD 分析，确定了 260 °C 下固态共存相的特征。没有发现准三元化合物。三元共晶温度为 315 ± 2 °C，在 LiCl-KCl-K3GdCl6 成分三角形中，其成分为 57 mol.% LiCl-42 mol.% KCl-1 mol.% GdCl3。在 LiCl-K3GdCl6-K2GdCl5 成分三角形中，另一个三元共晶温度为 308 ± 2 °C。推断其成分为 40.2 摩尔.%LiCl-41.7 摩尔.%KCl-18.1 摩尔.%GdCl3。在 LiCl-K2GdCl5-KGd2Cl7 成分三角形中，另一个三元共晶温度为 360 ± 9 °C。推断其成分为 33.8 摩尔.% LiCl-29.5 摩尔.% KCl-36.7 摩尔.% GdCl3。在 LiCl-KGd2Cl7-LiGdCl4 成分三角形中，第四个三元共晶温度为 362 ± 4 °C。其成分为 48 mol.% LiCl-11 mol.% KCl-41 mol.% GdCl3。在 370 ± 3 °C下观察到了 "L+GdCl3 ↔ LiGdCl4+KGd2Cl7 "的三元假包络反应。其成分为 46.7 摩尔.%LiCl-10.5 摩尔.%KCl-42.8 摩尔.%GdCl3。通过 DTA 实验的加热运行，推断出了样品的一次和二次结晶温度以及多晶相变温度。此外，还确定了造成各种热事件的相。绘制了选定温度下的等温成分三角形、Scheil 图和多热液相投影图，以及三元相场的等温等值线。

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来源期刊

Journal of Phase Equilibria and Diffusion 工程技术-材料科学：综合

CiteScore

2.50

自引率

7.10%

发文量

审稿时长

1 months

期刊介绍： The most trusted journal for phase equilibria and thermodynamic research, ASM International''s Journal of Phase Equilibria and Diffusion features critical phase diagram evaluations on scientifically and industrially important alloy systems, authored by international experts. The Journal of Phase Equilibria and Diffusion is critically reviewed and contains basic and applied research results, a survey of current literature and other pertinent articles. The journal covers the significance of diagrams as well as new research techniques, equipment, data evaluation, nomenclature, presentation and other aspects of phase diagram preparation and use. Content includes information on phenomena such as kinetic control of equilibrium, coherency effects, impurity effects, and thermodynamic and crystallographic characteristics. The journal updates systems previously published in the Bulletin of Alloy Phase Diagrams as new data are discovered.