Preparation of Sm2Fe17 alloy and induced mechanism by calciothermic reduction

Sm2Fe17 alloy was prepared via direct calciothermic reduction using SmF3 as raw material and iron as inducer. [Display omitted] •A novel method for preparing Sm2Fe17 alloy was proposed by iron-induced SmF3 through calciothermic reduction.•Sm2Fe17 alloy with low content of impurities calcium and oxyg...

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Bibliographic Details
Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2021-12, Vol.274, p.115447, Article 115447
Main Authors: Liu, Donghui, Lan, Qiaofa, Xie, Ziyu, Meng, Yuning, Zhang, Xiaolin, Niu, Fei, Yang, Youming
Format: Article
Language:English
Subjects:
Calciothermic reduction
Calcium
Composition
Crystal structure
Induced mechanism
Iron
Microstructure
Photomicrographs
Samarium
Samarium base alloys
Sm2Fe17
SmF3
Stoichiometry
X ray photoelectron spectroscopy
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Summary:Sm2Fe17 alloy was prepared via direct calciothermic reduction using SmF3 as raw material and iron as inducer. [Display omitted] •A novel method for preparing Sm2Fe17 alloy was proposed by iron-induced SmF3 through calciothermic reduction.•Sm2Fe17 alloy with low content of impurities calcium and oxygen was prepared.•The optimum technological parameters for Sm2Fe17 alloy fabrication were determined.•The induced mechanism of iron on preparing Sm2Fe17 alloy was investigated. SmF3 cannot be directly reduced to metallic samarium by calcium. In this work, we presented the thermodynamic calculation and preperation of Sm2Fe17 alloy by calciothermic reduction. The composition, crystal structure, elements distribution, chemical valence and induced mechanism of Sm2Fe17 alloy were analyzed and characterized by ICP, XRD, SEM, EDS and XPS. The results show that the feasibility of preparing Sm2Fe17 alloy by iron-induced SmF3 calciothermic reduction. The Sm and Fe component of SmFe alloy approximates the nominal composition of Sm2Fe17 alloy with 10% excess of SmF3 over the stoichiometry. The micrograph of the SmFe ingot exhibits fish-bone-like morphology and is composed of α-Fe, Sm2Fe17 and SmFe3 phases. The Sm and Fe elements of the samples demonstrate zero valency. Electrons from metallic Sm are drawn toward to the orbits of Fe and an Sm-Fe bond with ionic bond property is formed and being reduced by calcium to obtain Sm2Fe17 alloy.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2021.115447