# Rapid Preparation of Sm2Fe17N3 Fine Powder by Cryo-milling

https://mdr.nims.go.jp/datasets/aa2b8476-d4ef-41f2-b174-c80a4704ed7a

## File

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## Id

aa2b8476-d4ef-41f2-b174-c80a4704ed7a

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-08-13T08:58:13.688000Z

## Updated at

2025-08-20T03:30:36.784828Z

## Published at

2025-08-20T03:19:26.621976Z

## Doi

https://doi.org/10.48505/nims.5653

## First published url



## Date published



## Recorded date published



## Resource type

conference_poster

## Manuscript type

na

## Collection

- id: d28f086a-61aa-4bc7-bcae-5a1078cbc6c7
  identifier: https://mdr.nims.go.jp/pid/d28f086a-61aa-4bc7-bcae-5a1078cbc6c7
  title: The 28th International Workshop on Rare Earth and Future Permanent Magnets
    and Their Applications (REPM2025)

## Title

- title: Rapid Preparation of Sm2Fe17N3 Fine Powder by Cryo-milling
  title_type: original
  lang: en

## Description

- description: "Samarium iron nitride (Sm2Fe17N3) permanent magnetic materials possess
    excellent intrinsic magnetic properties, including a saturation magnetization
    of 1.54 T [1]. To reach the full potential, the key is to increase the coercivity
    of the powder. Since the coercivity mechanism of Sm2Fe17N3 is nucleation-controlled,
    reducing the grain size through grinding is a necessary step in preparing highperformance
    powders for Sm2Fe17N3 magnets [2-4]. In this study, by using the equipment named
    Freezer/Mill, the Sm2Fe17N3 coarse powder was ground by cryo-milling method at
    liquid nitrogen temperature. After 1 minute of grinding, the coercivity of the
    Sm2Fe17N3 powder went up from 1.5 kOe to 7.0 kOe, while after 4 minutes, the coercivity
    reached 13.4 kOe. However, as the grinding time increased further, the coercivity
    began to decrease. X-ray diffraction (XRD) results indicated that no α-Fe phase
    was generated during the grinding process, and the Sm2Fe17N3 diffraction peaks
    broadened continuously with increasing grinding time, showing that the liquid
    nitrogen conditions inhibit oxidation and thermal decomposition during the milling
    process of Sm2Fe17N3, and as the grinding time increases, the grain size of the
    Sm2Fe17N3 powder continuously decreases. Meanwhile, scanning electron microscope
    (SEM) results showed that the sample ground for 4 minutes by cryo-milling had
    a similar particle size to that of the sample ground for 120 minutes by conventional
    ball milling. This indicates that the material becomes more brittle at low temperatures,
    making it easier to break. Compared to jet milling and ball milling methods, cryo-milling
    does not require the use of conventional solvents, is more efficient, and effectively
    avoids heat and oxidation issues during the grinding process. The cryo-milling
    method thus provides a promising approach to fabricate high-performance Sm2Fe17N3
    powder.\r\n\r\nReferences\r\n[1] Coey, J. M. D., et al. (2019). Journal of Magnetism
    and Magnetic Materials 480: 186-192.\r\n[2] Liang, D., et al. (2023). AIP Advances
    13(2): 025104.\r\n[3] Ye, L., et al. (2024). Journal of Materials Research and
    Technology 30: 451-460.\r\n[4] Fang, Q., et al. (2016). Journal of Magnetism and
    Magnetic Materials 410: 116-122."
  description_type: abstract
  lang: en

## Creator

- name: Qiang Gao
  role: author
  organization: Institute of Condensed Matter and Material Physics, School of Physics,
    Peking University, China
- name: Dong Liang
  role: author
  organization: Institute of Condensed Matter and Material Physics, School of Physics,
    Peking University, China
- name: Hui-Dong Qian
  role: author
  organization: Institute of Condensed Matter and Material Physics, School of Physics,
    Peking University, China
- name: Tao Zhu
  role: author
  organization: Institute of Condensed Matter and Material Physics, School of Physics,
    Peking University, China
- name: Jingzhi Han
  role: author
  organization: Institute of Condensed Matter and Material Physics, School of Physics,
    Peking University, China
- name: Changsheng Wang
  role: author
  organization: Institute of Condensed Matter and Material Physics, School of Physics,
    Peking University, China
- name: Wenyun Yang
  role: author
  organization: Institute of Condensed Matter and Material Physics, School of Physics,
    Peking University, China
- name: Jinbo Yang
  role: author
  organization: Institute of Condensed Matter and Material Physics, School of Physics,
    Peking University, China

## Contact agent



## Publisher

organization: National Institute for Materials Science (NIMS)

## Managing organization



## Keyword

- subject: REPM2025
  schema: not_defined
- subject: Sm2Fe17N3
  schema: not_defined
- subject: cryo-milling
  schema: not_defined
- subject: coercivity
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal



## Conference

name: REPM2025
start_date: 2025-07-27
end_date: 2025-07-31
identifier: https://www.nims.go.jp/mmu/repm2025/

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## Fileset

- id: 1cda8098-5985-4e72-a291-2ac89071c359
  filename: REPM2025_P2-56_Gao.pdf
  content_type: application/pdf
  size: 1277210
  md5: ec3cf9f39ae9afa0c488f6e54569705b

## Thumbnail

fileset_id: 1cda8098-5985-4e72-a291-2ac89071c359
filename: REPM2025_P2-56_Gao.pdf