Regulation of crystal and microstructures of RETaO4 (RE = Nd, Sm, Gd, Ho, Er) powders synthesized via co-precipitation

IF 5.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths Pub Date : 2024-07-03 DOI:10.1016/j.jre.2024.06.032

Jiang Tian , Lin Chen , Xunlei Chen , Keren Luo , Baihui Li , Di Zhang , Meng Wang , Bing Xu , Zhiyi Ren , Shixiao Yan , Xiaoliang Sun , Chi Liu , Jing Feng

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引用次数: 0

Abstract

Ferroelastic rare earth tantalates (RETaO₄) are widely researched as the next-generation thermal barrier coatings (TBCs), and RETaO₄ powders are hugely significant for synthesizing their coatings. The current research used chemical co-precipitation within an automated experimental device to synthesize RETaO₄ (RE = Nd, Sm, Gd, Ho, Er) powders. The device automatically monitored and controlled the solutions' pH, improving the chemical co-precipitation efficiency. The crystal structure and microstructure of the RETaO₄ powders can be controlled by changing the annealing temperature, and the materials undergo an m'-m phase transition. The m'-RETaO₄ powders exhibit nano-size grains, while m-RETaO₄ powders evince micron-size grains, altered by the annealing temperatures. A simultaneous thermal analysis estimates the reversive ferroelastic tetragonal-monoclinic phase transition temperatures. Overall, this research focuses on the synthesis, crystal structures, microstructures, and phase transition of the fabricated RETaO₄ powders.

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通过共沉淀法合成的 RETaO4（RE = Nd、Sm、Gd、Ho、Er）粉末的晶体和微观结构调控

铁弹性稀土钽酸盐（RETaO4）作为新一代热障涂层得到了广泛的研究，而铁弹性稀土钽酸盐粉末对其涂层的合成具有重要意义。本研究采用化学共沉淀法在自动化实验装置内合成RETaO4 （RE = Nd, Sm, Gd, Ho, Er）粉体。该装置对溶液的pH值进行了自动监测和控制，提高了化学共沉淀效率。通过改变退火温度可以控制RETaO4粉末的晶体结构和微观结构，材料发生m′-m相变。m′-RETaO4粉末表现为纳米级晶粒，而m-RETaO4粉末表现为微米级晶粒，晶粒大小随退火温度的变化而变化。同时热分析估计了铁弹性逆四方-单斜相变温度。总体而言，本研究重点研究了制备的RETaO4粉末的合成、晶体结构、微观结构和相变。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Rare Earths 化学-应用化学

CiteScore

8.70

自引率

14.30%

发文量

374

审稿时长

1.7 months

期刊介绍： The Journal of Rare Earths reports studies on the 17 rare earth elements. It is a unique English-language learned journal that publishes works on various aspects of basic theory and applied science in the field of rare earths (RE). The journal accepts original high-quality original research papers and review articles with inventive content, and complete experimental data. It represents high academic standards and new progress in the RE field. Due to the advantage of abundant RE resources of China, the research on RE develops very actively, and papers on the latest progress in this field emerge every year. It is not only an important resource in which technicians publish and obtain their latest research results on RE, but also an important way of reflecting the updated progress in RE research field. The Journal of Rare Earths covers all research and application of RE rare earths including spectroscopy, luminescence and phosphors, rare earth catalysis, magnetism and magnetic materials, advanced rare earth materials, RE chemistry & hydrometallurgy, RE metallography & pyrometallurgy, RE new materials, RE solid state physics & solid state chemistry, rare earth applications, RE analysis & test, RE geology & ore dressing, etc.