Phase Equilibrium Investigations and Thermodynamic Study of the Y2O3-Ta2O5 System

IF 1.5 4区材料科学 Q4 CHEMISTRY, PHYSICAL

Journal of Phase Equilibria and Diffusion Pub Date : 2024-08-23 DOI:10.1007/s11669-024-01137-4

M. Löffler, O. Fabrichnaya

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Abstract

Two methods were used to investigate the Y₂O₃-Ta₂O₅ system: the equilibration method, which covered temperatures from 1573 to 1973 K, and the DTA method, which reached up to 2473 K. Phase identification was carried out using x-ray diffraction and scanning electron microscopy with energy-dispersive x-ray spectroscopy (SEM/EDX). The temperature of the eutectic reaction, L → YTa₃O₉ (P) + Ta₂O₅, was determined to be 2019 K, with the corresponding eutectic composition being 78 mol.% Ta₂O₅. The study presents evidence that contradicts the existence of the eutectic reaction L → YTaO₄ (T) + YTa₃O₉ (P). Instead, it identifies a peritectic reaction L + YTaO₄ (T) → YTa₃O₉ (P), which was observed at a temperature of around 2075 K. Additionally, the heat capacity of the YTa₃O₉ (P) phase was measured using differential scanning calorimetry (DSC) over the temperature range from 240 to 1300 K. The results of this experimental investigation will lead to the development of a thermodynamic database for the Y₂O₃-Ta₂O₅ system.

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Y2O3-Ta2O5 系统的相平衡调查和热力学研究

对 Y2O3-Ta2O5 体系的研究采用了两种方法：平衡法（温度范围从 1573 K 到 1973 K）和 DTA 法（温度高达 2473 K）。共晶反应 L → YTa3O9 (P) + Ta2O5 的温度被确定为 2019 K，相应的共晶成分为 78 mol.% Ta2O5。该研究提出的证据与共晶反应 L → YTaO4 (T) + YTa3O9 (P) 的存在相矛盾。此外，还利用差示扫描量热仪（DSC）测量了 YTa3O9 (P) 相在 240 至 1300 K 温度范围内的热容量。

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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.