SmF3 的钙热还原反应行为和钐离子价态演变

IF 1.5 4区 工程技术 Q3 METALLURGY & METALLURGICAL ENGINEERING Mining, Metallurgy & Exploration Pub Date : 2024-07-24 DOI:10.1007/s42461-024-01044-9
Donghui Liu, Fei Niu, Xiaolin Zhang, Leiting Shen, Youming Yang
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引用次数: 0

摘要

钐是一种稀土元素,具有 + 2 和 + 3 的可变价态。在这项研究中,我们展示了在不同的 Ca 与 SmF3 摩尔比下,通过钙热还原 SmF3 得到的还原产物。利用 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、能量色散 X 射线光谱 (EDS) 和 X 射线光电子能谱 (XPS) 对还原产物的晶体结构、形态、元素分布和化合价进行了表征。结果表明,在 Ca 与 SmF3 的摩尔比为 0.5、1、1.5 和 2 时,SmF2.028 和 CaF2 是唯一的还原产物,而在 Ca 与 SmF3 的摩尔比为 2 时,产物中检测到一些未反应的金属 Ca。 还原产物中的钐离子呈现混合价态,Sm3+ 和 Sm2+ 的相对含量约为 9:1。值得注意的是,产物中存在的大量吸附氧会将 Sm2+ 氧化成 Sm3+。
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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Calciothermic Reduction Reaction Behavior and Samarium Ion Valence Evolution of SmF3

Samarium is a rare earth element that exhibits variable valence states of + 2 and + 3. In this work, we present the reduction products obtained through calciothermic reduction of SmF3 at various molar ratios of Ca to SmF3. The crystal structure, morphology, elemental distribution, and chemical valence of the reduction products were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The results show that SmF2.028 and CaF2 are the sole reduction products obtained under molar ratios of 0.5, 1, 1.5, and 2 for Ca to SmF3, whereas some unreacted metallic Ca is detected in the products at a molar ratio of Ca to SmF3 of 2. The samarium ions in the reduction products exhibit mixed valence states with a relative content of approximately 9:1 for Sm3+ and Sm2+. Notably, the large amount of adsorbed oxygen present in the products oxidizes Sm2+ to Sm3+.

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来源期刊
Mining, Metallurgy & Exploration
Mining, Metallurgy & Exploration Materials Science-Materials Chemistry
CiteScore
3.50
自引率
10.50%
发文量
177
期刊介绍: The aim of this international peer-reviewed journal of the Society for Mining, Metallurgy & Exploration (SME) is to provide a broad-based forum for the exchange of real-world and theoretical knowledge from academia, government and industry that is pertinent to mining, mineral/metallurgical processing, exploration and other fields served by the Society. The journal publishes high-quality original research publications, in-depth special review articles, reviews of state-of-the-art and innovative technologies and industry methodologies, communications of work of topical and emerging interest, and other works that enhance understanding on both the fundamental and practical levels.
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