Synthesis of ultra-high coercivity Sm2Fe17N3 powder by homogeneous reduction-diffusion with rotary furnace

Okada, Shusuke; Node, Eri; Takagi, Kenta; Hashimoto, Ryuji

doi:10.1016/j.jallcom.2023.170726

Cited by 8 publications

(2 citation statements)

References 22 publications

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“…Therefore, the data confirm the effect of the optimal amount of the Cu additive in Sm 2 Fe 17 N 3 in improving the magnetic performance by lowering the temperature of the reduction–diffusion process (Table ). ,− The Sm 2 Fe 17 N 3 composite with the Cu additive has potential applications in magnetic actuators because the particle size can be simply controlled by adjusting the temperature. The responsiveness of magnetic composites depends on the size of the magnetic particles embedded in the composites.…”

Section: Results and Discussionmentioning

confidence: 99%

Advanced Magnetic Actuation: Harnessing the Dynamics of Sm₂Fe_17–xCu_xN₃ Composites

Koo,

Kwon,

Park

et al. 2024

ACS Appl. Mater. Interfaces

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Recently, there has been an escalating demand for advanced materials with superior magnetic properties, especially in the actuator domain. High coercivity (H ci ), an essential magnetic property, is pivotal for programmable shape changes in magnetic actuators and profoundly affects their performance. In this study, a new Sm 2 Fe 17−x Cu x N 3 magnet with a high H ci was achieved by modifying the temperature of the reduction−diffusion process� lowering it from 900 to 700 °C through the introduction of Cu and finer control over the structure and morphology of the Sm 2 Fe 17−x Cu x N 3 magnetic component within the actuator composite. Consequently, the Sm 2 Fe 17−x Cu x N 3 magnet demonstrated a remarkable H ci of 11.5 kOe, eclipsing the value of 6.9 kOe attained by unalloyed Sm 2 Fe 17 N 3 at reduced temperatures. By capitalizing on the enhanced magnetic properties of the Sm 2 Fe 17−x Cu x N 3 composite and incorporating poly(ethylene glycol) into the elastomer matrix, we successfully fabricated a robust actuator. This innovative approach harnesses the strengths of hard magnets as actuators, offering stability under high-temperature conditions, precision control, longevity, wireless functionality, and energy efficiency, highlighting the vast potential of hard magnets for a range of applications.

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Section: Results and Discussionmentioning

confidence: 99%

Advanced Magnetic Actuation: Harnessing the Dynamics of Sm₂Fe_17–xCu_xN₃ Composites

Koo,

Kwon,

Park

et al. 2024

ACS Appl. Mater. Interfaces

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“…Annealing is usually performed in vacuum furnaces; however, H 2 flow is also used [32]. An alternative technology is the reduction-diffusion process where Ca stands as a reductant for samarium oxide during heat treatment [33].…”

Section: Introductionmentioning

confidence: 99%

The Structure and Magnetic Properties of Sm2Fe17Cx Compounds Prepared from Ball-Milled Mixtures of Sm2Fe17 and Carbon Nanotubes or Graphite

Mikheev,

Bordyuzhin,

Gorshenkov

et al. 2024

Metals

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The processing route of Sm2Fe17 carbides is shorter than that of nitrides, which can potentially be used for cost-effective mid-performance magnets’ production. The magnetic properties of Sm2Fe17Cx compounds can be controlled at the annealing step, which allows them to be used for a variety of applications. In this work, X-ray diffraction (XRD) analysis, Mössbauer spectroscopy, scanning and transmission electron microscopy (SEM, TEM) and vibrating sample magnetometry (VSM) were used for characterization of the structure and magnetic properties of Sm2Fe17Cx compounds. The powder samples were prepared by high-energy ball milling of Sm2Fe17 mixtures with carbon nanotubes (CNT) or graphite with subsequent annealing. The formation of Sm2Fe17Cx compounds after annealing was followed by the formation of α-Fe and amorphous Sm2O3. The hyperfine field values of Fe atoms of all the Sm2Fe17 lattice sites increased by 12% on average after annealing that was caused by carbon diffusion. The coercivity of the samples peaked after annealing at 375 °C. The samples with CNT demonstrated an increase of up to 14% in coercivity and 5% in specific remanence in the range of 250–375 °C annealing temperatures.

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Ultrafine Sm2Fe17N3 hard magnetic particles synthesized by mechanochemical process

Yang,

Chen,

Yang

et al. 2024

Applied Materials Today

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Synthesis of ultra-high coercivity Sm2Fe17N3 powder by homogeneous reduction-diffusion with rotary furnace

Cited by 8 publications

References 22 publications

Advanced Magnetic Actuation: Harnessing the Dynamics of Sm₂Fe_17–xCu_xN₃ Composites

Advanced Magnetic Actuation: Harnessing the Dynamics of Sm₂Fe_17–xCu_xN₃ Composites

The Structure and Magnetic Properties of Sm2Fe17Cx Compounds Prepared from Ball-Milled Mixtures of Sm2Fe17 and Carbon Nanotubes or Graphite

Ultrafine Sm2Fe17N3 hard magnetic particles synthesized by mechanochemical process

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Synthesis of ultra-high coercivity Sm2Fe17N3 powder by homogeneous reduction-diffusion with rotary furnace

Cited by 8 publications

References 22 publications

Advanced Magnetic Actuation: Harnessing the Dynamics of Sm2Fe17–xCuxN3 Composites

Advanced Magnetic Actuation: Harnessing the Dynamics of Sm2Fe17–xCuxN3 Composites

The Structure and Magnetic Properties of Sm2Fe17Cx Compounds Prepared from Ball-Milled Mixtures of Sm2Fe17 and Carbon Nanotubes or Graphite

Ultrafine Sm2Fe17N3 hard magnetic particles synthesized by mechanochemical process

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Product

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Advanced Magnetic Actuation: Harnessing the Dynamics of Sm₂Fe_17–xCu_xN₃ Composites

Advanced Magnetic Actuation: Harnessing the Dynamics of Sm₂Fe_17–xCu_xN₃ Composites