Single crystal growth and magnetic properties of 2:17-type SmCo magnets

Zhang, Tianli; Liu, Hongyuan; Ma, Zhenhui; Jiang, Chengbao

doi:10.1016/j.jallcom.2015.03.015

Cited by 30 publications

(2 citation statements)

References 18 publications

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“…Samarium cobalt (SmCo) alloys are a special class of rare earth metal (REM) magnetic materials that are important for magnetic and electronic applications in a broad temperature range. − Nanostructured SmCo, especially SmCo nanoparticles (NPs), may serve as magnetic building blocks for fabrication of permanent magnets with further enhanced magnetic performance. − With dimension-tunable magnetic properties, these SmCo NPs can be made with both large coercivity and high magnetic moment, making it possible to prepare nanocomposites with high energy products that are key to miniaturizing magnetic and electronic components. − There have been tremendous efforts devoted to preparing nanostructured SmCo or SmCo NPs via both physical and chemical processes. − A physical process is often considered a top-down approach in which a bulk material is fragmented into nanostructured features or thin films. , As a comparison, a solution phase chemical process is a conventional bottom-up approach and has the potential to control both NP dimension and dispersion, making it possible to assemble these NPs into high performance nanocomposite magnets. − However, chemicals involved in any of the solution processes do make the product purification challenging, which is further aggravated by easy oxidation of nanostructured SmCo alloys, degrading their magnetic performance. ,− …”

Section: Introductionmentioning

confidence: 99%

Stabilizing Hard Magnetic SmCo₅ Nanoparticles by N-Doped Graphitic Carbon Layer

Yue

Liu

et al. 2020

J. Am. Chem. Soc.

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We report a chemical method to synthesize size-controllable SmCo5 nanoparticles (NPs) and to stabilize the NPs against air oxidation by coating a layer of N-doped graphitic carbon (NGC). First 10 nm CoO and 5 nm Sm2O3 NPs were synthesized and aggregated in reverse micelles of oleylamine to form SmCo-oxide NPs with a controlled size (110, 150, or 200 nm). The SmCo-O NPs were then coated with polydopamine and thermally annealed to form SmCo-O/NGC NPs, which were further embedded in CaO matrix and reduced with Ca at 850 °C to give SmCo5/NGC NPs of 80, 120, or 180 nm, respectively. The 10 nm NGC coating efficiently stabilized the SmCo5 NPs against air oxidation at room temperature or at 100 °C. The magnetization value of the 180 nm SmCo5/NGC NPs was stabilized at 86.1 emu/g 5 days after air exposure at room temperature and dropped only 1.7% 48 h after air exposure at 100 °C. The stable SmCo5/NGC NPs were aligned magnetically in an epoxy resin, showing a square-like hysteresis behavior with their H c reaching 51.1 kOe at 150 K and 21.9 kOe at 330 K and their Mr stabilized at around 84.8 emu/g. Our study demonstrates a new strategy for synthesizing and stabilizing SmCo5 NPs for high-performance nanomagnet applications in a broad temperature range.

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Section: Introductionmentioning

confidence: 99%

Stabilizing Hard Magnetic SmCo₅ Nanoparticles by N-Doped Graphitic Carbon Layer

Yue

Liu

et al. 2020

J. Am. Chem. Soc.

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“…In this work, we developed a novel protocol to stabilize the interface of SmCo 5 /Co biphase nanocomposites with the assistance of graphene sheets. Here, we chose SmCo 5 as a model material to generate the desired nanocomposites, as the Sm-Co hard magnetic material has exceptionally large magnetocrystalline anisotropy and high Curie temperature, which make it more suitable for high-temperature applications [29][30][31]. This synthesis started with the fabrication of SmCo-OH/GO.…”

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Stabilizing interface of SmCo5/Co nanocomposites by graphene shells

2021

Rare Met.

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A Flame‐Reaction Method for the Large‐Scale Synthesis of High‐Performance Sm_xCo_y Nanomagnets

Tian

Cong

et al. 2019

Angewandte Chemie

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We report a flame‐reaction method to synthesize high‐performance SmxCoy (x=1, y=5; x=2, y=17) particles on a multigram scale. This flame reaction allows the controlled decomposition of Sm(NO3)3 and Co(NO3)2 to 320 nm SmCo‐O (SmCoO3 + Co3O4) particles. A 5.8 g sample of SmCo3.8‐O particles was coated with CaO and then reduced at 900 °C by Ca to give 4.2 g of 260 nm SmCo5 particles. The SmCo5 particles are strongly ferromagnetic and the aligned particles in epoxy resin exhibit a large room‐temperature coercivity (Hc) of 41.8 kOe and giant (BH)max (maximum magnetic energy product) of 19.6 MGOe, the highest value ever reported for SmCo5 made by chemical methods. This synthesis can be extended to synthesize Sm2Co17 particles, providing a general approach to scaling up the synthesis of high‐performance SmxCoy nanomagnets for permanent magnet applications.

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Single crystal growth and magnetic properties of 2:17-type SmCo magnets

Cited by 30 publications

References 18 publications

Stabilizing Hard Magnetic SmCo₅ Nanoparticles by N-Doped Graphitic Carbon Layer

Stabilizing Hard Magnetic SmCo₅ Nanoparticles by N-Doped Graphitic Carbon Layer

Stabilizing interface of SmCo5/Co nanocomposites by graphene shells

A Flame‐Reaction Method for the Large‐Scale Synthesis of High‐Performance Sm_xCo_y Nanomagnets

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Single crystal growth and magnetic properties of 2:17-type SmCo magnets

Cited by 30 publications

References 18 publications

Stabilizing Hard Magnetic SmCo5 Nanoparticles by N-Doped Graphitic Carbon Layer

Stabilizing Hard Magnetic SmCo5 Nanoparticles by N-Doped Graphitic Carbon Layer

Stabilizing interface of SmCo5/Co nanocomposites by graphene shells

A Flame‐Reaction Method for the Large‐Scale Synthesis of High‐Performance SmxCoy Nanomagnets

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Product

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Stabilizing Hard Magnetic SmCo₅ Nanoparticles by N-Doped Graphitic Carbon Layer

Stabilizing Hard Magnetic SmCo₅ Nanoparticles by N-Doped Graphitic Carbon Layer

A Flame‐Reaction Method for the Large‐Scale Synthesis of High‐Performance Sm_xCo_y Nanomagnets