Exploiting mechanochemical activation and molten-salt-assisted reduction-diffusion approach in bottom-up synthesis of Sm2Fe17N3
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2024-01-14
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Elsevier
Abstract
Sm2Fe17N3 powders were prepared by a novel molten-salt mechanochemically assisted reduction-diffusion (RD) approach. CaCl2, plays a critical role during mechanochemical processing as a dispersant, facilitating the RD process by dissolving the precursors in a molten flux and further assisting during the washing step by efficient removal of by-products thus minimizing the surface oxidation of Sm2Fe17N3 powder particles. Various milling times and RD temperatures were examined, and synthesis conditions were optimized to achieve pure-phase Sm2Fe17N3 powders with low aggregation of magnetic particles. Powders synthesized at 950 °C RD exhibited the highest hard-magnetic properties: coercivity Hc of 13.5 kOe, and maximum energy product (BH)max of 19.4 MGOe. This was attributed to the formation of fine single-phase Sm2Fe17N3 particles as well as minimal oxidation of particle surface. Furthermore, by densifying the Sm2Fe17N3 powders with high-pressure spark plasma sintering, a bulk magnet with (BH)max of 16.5 MGOe and a relative density of 86% was produced indicating that the obtained Sm2Fe17N3 powders had low oxygen content.
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This is a manuscript of an article published as Kuchi, Rambabu, Deborah Schlagel, Thomas A. Seymour-Cozzini, Julia V. Zaikina, and Ihor Z. Hlova. "Exploiting mechanochemical activation and molten-salt-assisted reduction-diffusion approach in bottom-up synthesis of Sm2Fe17N3." Journal of Alloys and Compounds 980 (2024): 173532. doi: https://doi.org/10.1016/j.jallcom.2024.173532.
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This manuscript is made available under the Elsevier user license (https://www.elsevier.com/open-access/userlicense/1.0/)