Minimizing particle aggregation in Sm2Fe17N3 powders: A CaO-assisted reduction-diffusion approach

Kuchi, Rambabu; Seymour-Cozzini, Thomas A.; Zaikina, Julia V.; Hlova, Ihor Z.; Kramer, Matthew J.

doi:10.1016/j.jallcom.2025.181020

Minimizing particle aggregation in Sm₂Fe₁₇N₃ powders: A CaO-assisted reduction-diffusion approach

Journal Article · Sat May 17 20:00:00 EDT 2025 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2025.181020· OSTI ID:2571464

^[1]; Seymour-Cozzini, Thomas A. ^[2]; ^[2]; Hlova, Ihor Z. ^[1]; Kramer, Matthew J. ^[1]

Ames Lab., and Iowa State Univ., Ames, IA (United States)
Iowa State Univ., Ames, IA (United States)

We report a novel synthesis of Sm₂Fe₁₇N₃ powders using a CaO-assisted reduction-diffusion (RD) approach. CaO plays a crucial role during mechanochemical processing – acting both as a dispersant and a surface coating agent, which helps to prevent agglomeration due to sintering of Sm₂Fe₁₇ particles during the RD step. Together with the added dispersant, the CaO by-product formed during RD can be easily removed in the washing step resulting in fewer aggregated Sm₂Fe₁₇N₃ particles and lower oxygen contamination in the final product. The impact of varying CaO amounts was examined, and synthesis conditions were optimized to achieve phase-pure Sm₂Fe₁₇N₃ powders with less aggregation of magnetic particles. The powders synthesized with addition of 1 wt% CaO as dispersant exhibited the highest hard-magnetic properties: a coercivity (H_c) of 10.7 kOe and a maximum energy product ((BH)_max) of 17.3 MGOe. By densifying the Sm₂Fe₁₇N₃ powders using high-pressure spark plasma sintering, a bulk magnet with a (BH)_max of 21.1 MGOe with 88 % of theoretical density was produced. In conclusion, reducing aggregation of the Sm₂Fe₁₇N₃ increases coercivity and remanence of these magnets.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Materials & Manufacturing Technologies Office (AMMTO); National Science Foundation (NSF)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2571464

Alternate ID(s):: OSTI ID: 2568206

Journal Information:: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Vol. 1031; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (27)

Improved magnetic properties by treatment of iron-based rare earth intermetallic compounds in anmonia Coey, J. M. D.; Sun, Hong Journal of Magnetism and Magnetic Materials, Vol. 87, Issue 3 https://doi.org/10.1016/0304-8853(90)90756-G	journal	July 1990
The chemical synthesis of SmCo5 single-crystal particles with small size and high performance Ma, Zhenhui; Yang, Shengxue; Zhang, Tianli Chemical Engineering Journal, Vol. 304 https://doi.org/10.1016/j.cej.2016.07.024	journal	November 2016
Hard magnetic Sm2Fe17N3 flakes nitrogenized at lower temperature Zhao, Lixin; Akdogan, Nilay G.; Hadjipanayis, George C. Journal of Alloys and Compounds, Vol. 554 https://doi.org/10.1016/j.jallcom.2012.11.153	journal	March 2013
Direct preparation of submicron-sized Sm2Fe17 ultra-fine powders by reduction-diffusion technique Okada, Shusuke; Takagi, Kenta; Ozaki, Kimihiro Journal of Alloys and Compounds, Vol. 663 https://doi.org/10.1016/j.jallcom.2015.12.124	journal	April 2016
Preparation of submicron-sized Sm2Fe17N3 fine powder with high coercivity by reduction-diffusion process Okada, Shusuke; Suzuki, Kazuyuki; Node, Eri Journal of Alloys and Compounds, Vol. 695 https://doi.org/10.1016/j.jallcom.2016.10.306	journal	February 2017
Enhanced magnetic and structural properties of chemically prepared Nd-Fe-B particles by reduction-diffusion method through optimization of heat treatments Kim, Seunghyun; Galkin, Vitalii; Jeong, Jong-Ryul Journal of Alloys and Compounds, Vol. 869 https://doi.org/10.1016/j.jallcom.2021.159337	journal	July 2021
Exploiting mechanochemical activation and molten-salt-assisted reduction-diffusion approach in bottom-up synthesis of Sm2Fe17N3 Kuchi, Rambabu; Schlagel, Deborah; Seymour-Cozzini, Thomas A. Journal of Alloys and Compounds, Vol. 980 https://doi.org/10.1016/j.jallcom.2024.173532	journal	April 2024
Microstructural behavior on particle surfaces and interfaces in Sm2Fe17N3 powder compacts during low-temperature sintering Takagi, Kenta; Nakayama, Hiroyuki; Ozaki, Kimihiro Journal of Magnetism and Magnetic Materials, Vol. 324, Issue 15 https://doi.org/10.1016/j.jmmm.2012.02.021	journal	August 2012
Production of Sm–Fe–N bulk magnets by spark plasma sintering method Saito, Tetsuji Journal of Magnetism and Magnetic Materials, Vol. 369, p. 184-188 https://doi.org/10.1016/j.jmmm.2014.06.034	journal	November 2014
Sm-Fe-N revisited; remanence enhancement in melt-spun Nitroquench material Coey, J. M. D.; Stamenov, P.; Porter, S. B. Journal of Magnetism and Magnetic Materials, Vol. 480 https://doi.org/10.1016/j.jmmm.2019.02.076	journal	June 2019
Possibility of high-performance Sm2Fe17N3 sintered magnets by low-oxygen powder metallurgy process Takagi, Kenta; Soda, Rikio; Jinno, Miho Journal of Magnetism and Magnetic Materials, Vol. 506 https://doi.org/10.1016/j.jmmm.2020.166811	journal	July 2020
Nd-Fe-B particles with reduced oxygen content and enhanced magnetic properties prepared through reduction-diffusion and novel washing process Galkin, Vitalii; Kuchi, Rambabu; Kim, Seunghyun Journal of Magnetism and Magnetic Materials, Vol. 578 https://doi.org/10.1016/j.jmmm.2023.170832	journal	July 2023
Microwave-assisted chemical synthesis of SmCo5 magnetic particles with high coercivity Wang, Yatao; Yang, Zhi; Xu, Haibo Journal of Magnetism and Magnetic Materials, Vol. 579 https://doi.org/10.1016/j.jmmm.2023.170855	journal	August 2023
Sm–Fe–N bulk magnets produced by compression shearing method Saito, Tetsuji; Fukui, Masato; Takeishi, Hiroyuku Scripta Materialia, Vol. 53, Issue 10 https://doi.org/10.1016/j.scriptamat.2005.07.025	journal	November 2005
High energy product chemically synthesized exchange coupled Nd₂Fe₁₄B/α-Fe magnetic powders Parmar, Harshida; Xiao, T.; Chaudhary, V. Nanoscale, Vol. 9, Issue 37 https://doi.org/10.1039/C7NR02348K	journal	January 2017
A new strategy to synthesize anisotropic SmCo ₅ nanomagnets Shen, Bo; Yu, Chao; Su, Dong Nanoscale, Vol. 10, Issue 18 https://doi.org/10.1039/C8NR01690A	journal	January 2018
A novel strategy to synthesize anisotropic SmCo ₅ particles from Co/Sm(OH) ₃ composites with special morphology Li, Chenglin; Wu, Qiong; Ma, Zhenhui Journal of Materials Chemistry C, Vol. 6, Issue 31 https://doi.org/10.1039/C8TC02048E	journal	January 2018
Nitrogenation effect of Sm2Fe17 alloys prepared by strip casting technique Xing, Meiying; Han, Jingzhi; Zhang, Yinfeng Journal of Applied Physics, Vol. 117, Issue 17 https://doi.org/10.1063/1.4916495	journal	March 2015
Investigation of optimal route to fabricate submicron-sized Sm2Fe17 particles with reduction-diffusion method Okada, Shusuke; Takagi, Kenta; Ozaki, Kimihiro AIP Advances, Vol. 6, Issue 5 https://doi.org/10.1063/1.4944077	journal	March 2016
Anisotropic Sm2Fe17N3 sintered magnets without coercivity deterioration Soda, Rikio; Takagi, Kenta; Jinno, Miho AIP Advances, Vol. 6, Issue 11 https://doi.org/10.1063/1.4967364	journal	November 2016
Preparation of submicron-sized Sm2Fe17N3 fine powder by ultrasonic spray pyrolysis-hydrogen reduction (USP-HR) and subsequent reduction–diffusion process Zheng, Jingwu; Tian, Shijun; Liu, Kaihua AIP Advances, Vol. 10, Issue 5 https://doi.org/10.1063/1.5145344	journal	May 2020
Study of the anisotropic Sm2Fe17N3 powders with high performance Liang, Dong; Yang, Wenyun; Wang, Xinan AIP Advances, Vol. 13, Issue 2 https://doi.org/10.1063/9.0000602	journal	February 2023
Bi-modal particle size distribution for high energy product hybrid Nd–Fe–B—Sm–Fe–N bonded magnets Parmar, Harshida; Paranthaman, M. Parans; Nlebedim, I. C. AIP Advances, Vol. 14, Issue 1 https://doi.org/10.1063/9.0000819	journal	January 2024
Synthesis of NdFeB Magnetic Particles With High (BH)_max From Their Optimized Oxide Powders Through Reduction–Diffusion Method Kuchi, Rambabu; Galkin, Vitalii; Kim, Seunghyun IEEE Magnetics Letters, Vol. 13 https://doi.org/10.1109/LMAG.2022.3178667	journal	January 2022
Induction Motors Versus Permanent-Magnet Actuators for Aerospace Applications Kakosimos, Panagiotis E.; Sarigiannidis, Athanasios G.; Beniakar, Minos E. IEEE Transactions on Industrial Electronics, Vol. 61, Issue 8 https://doi.org/10.1109/TIE.2013.2274425	journal	August 2014
Role of Surface Iron Oxides in Coercivity Deterioration of Sm₂Fe₁₇N₃ Magnet Associated with Low Temperature Sintering Yamaguchi, Wataru; Soda, Rikio; Takagi, Kenta MATERIALS TRANSACTIONS, Vol. 60, Issue 3 https://doi.org/10.2320/matertrans.M2018358	journal	March 2019
Enhanced Nd-Rich Phase and Oxygen Control in Reduction-Diffusion Powders via Tailored Washing Process for Additive-Free Sintering of Fine Nd-Fe-B Particles Galkin, Vitalii; Kuchi, Rambabu; Kwon, Soon-Jae Journal of Magnetics, Vol. 29, Issue 1 https://doi.org/10.4283/JMAG.2024.29.1.1	journal	March 2024

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Related Subjects

36 MATERIALS SCIENCE
CaO
Dispersant
Magnet
Mechanochemical
Reduction-diffusion
Sm2Fe17N3
Spark-plasma sintering