Crystal structures and magnetic performance of nanocrystalline Sm-Co compounds

Song, Xiaoyan; Zhang, Zhexu; Lu, Nianduan; Liang, Hai-Ning; Li, Ding-Peng; Yan, Xiangquan; Zhang, Jiuxing

doi:10.1007/s11706-012-0171-7

Cited by 14 publications

(7 citation statements)

References 37 publications

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“…SmCo 5 crystallizes in the hexagonal CaCu 5 -type structure with three nonequivalent atomic sites, Sm1 (Sm 1a), Co1 (Co 2c), and Co2 (Co 3g), with six atoms per formula unit and per computational cell (Figure A). , Sm 2 Co 17 also has a hexagonal structure, but with four Sm atoms and 34 Co atoms involved in the basic structure, its crystal unit cell is much larger than that of SmCo 5 . In this unit cell, two Sm atoms are in “b” sites and two are in “d” sites, while Co atoms occupy “f” sites (four atoms), “g” sites (six atoms), “j” sites (12 atoms), and “k” sites (12 atoms) (Figure B) . The world’s first rare-earth permanent magnets were based on SmCo 5 .…”

Section: Synthesis Of Magnetic Nanoparticles With Enhanced Anisotropy...mentioning

confidence: 99%

“…In this unit cell, two Sm atoms are in "b" sites and two are in "d" sites, while Co atoms occupy "f" sites (four atoms), "g" sites (six atoms), "j" sites (12 atoms), and "k" sites (12 atoms) (Figure 17B). 115 The world's first rare-earth permanent magnets were based on SmCo 5 . Despite their huge uniaxial anisotropy and high Curie temperature, their magnetization value (97.6 emu/g) is relatively small compared with those of Fe-based REM alloy magnets, limiting their (BH) max energy product only to 24 MGOe.…”

Section: Other Transition Metal Alloy Nanoparticlesmentioning

confidence: 99%

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Magnetic Nanoparticles: Synthesis, Anisotropy, and Applications

et al. 2021

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Anisotropy is an important and widely present characteristic of materials that provides desired direction-dependent properties. In particular, the introduction of anisotropy into magnetic nanoparticles (MNPs) has become an effective method to obtain new characteristics and functions that are critical for many applications. In this review, we first discuss anisotropy-dependent ferromagnetic properties, ranging from intrinsic magnetocrystalline anisotropy to extrinsic shape and surface anisotropy, and their effects on the magnetic properties. We further summarize the syntheses of monodisperse MNPs with the desired control over the NP dimensions, shapes, compositions, and structures. These controlled syntheses of MNPs allow their magnetism to be finely tuned for many applications. We discuss the potential applications of these MNPs in biomedicine, magnetic recording, magnetotransport, permanent magnets, and catalysis. CONTENTS 4.5.1. Co-Based Rare-Earth Metal Alloy Nanoparticles 3917 4.5.2. Fe-Based Rare-Earth Metal Alloy Nanoparticles 4.6. Rare-Earth-Metal-Free Nanoparticles 4.6.1. MnBi and MnAl Nanoparticles 4.6.2. Metal Carbide Nanoparticles 5. Magnetic Nanoparticles with Enhanced Anisotropy for Biomedical Applications 5.1. Magnetic Nanoparticles for MRI 5.1.1. MRI in General 5.1.2. Magnetic Nanoparticles as MRI Contrast AgentS 5.1.3. Cubic Ferrite Nanoparticles as T 2 -Weighted MRI Contrast Agents 5.1.4. Cubic Ferrite Nanoparticles as T 1 -Weighted MRI Contrast Agents 5.

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Section: Synthesis Of Magnetic Nanoparticles With Enhanced Anisotropy...mentioning

confidence: 99%

Section: Other Transition Metal Alloy Nanoparticlesmentioning

confidence: 99%

Magnetic Nanoparticles: Synthesis, Anisotropy, and Applications

et al. 2021

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“…Increasing attention has been devoted to the research and development of nanoscale rare-earth permanent magnetic materials in recent years [46,63] and these exhibit superior properties compared with their conventional coarse-grained counterparts. A high coercivity can be obtained in a nanostructured alloy because the magnetization reversal is strongly pinned by the grain boundaries that are extremely increased with the decrease of grain size in nanocrystalline materials [46] . In addition, some Sm-Co phases that are metastable in the conventional coarse-grained alloy system can be stabilized in the nanocrystalline system due to the nanoscale effect on the phase stability [64] .…”

Section: Phases In Sm-co Alloysmentioning

confidence: 99%

“…In this review, we provide an overview of modeling studies of phase stability in alloys, including theories, models and methods. The Sm-Co alloy system, as one of the two most famous rare-earth permanent magnetic materials families [45] , is taken as an example, with the consideration that this system is rich in various stable and metastable phases under the conditions of binary compositions [46][47][48][49][50][51][52][53] . Efforts are made to introduce the progress in the studies of the phase stability and transformation behavior of Sm-Cobased alloys, in which the development of the research approaches from the traditional CMS methods to strategies based on the materials informatics is particularly demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Modelling of phase stability: integrating computational materials science and materials informatics

Song¹,

Kai²,

Liu³

et al. 2021

JMI

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With rapid developments in big data and artificial intelligence technologies, materials informatics has become a new paradigm of materials science and engineering. In this review, the progress of modeling studies of phase stability in alloys is presented, with particular attention given to the development of the paradigm from traditional computational materials science (CMS) to materials informatics. The features of CMS models for phase stability studies are compared with those of data-driven approaches. The advantages of data-driven modeling in the framework of materials informatics are revealed. The approaches for developing interpretable machine learning, which has been mainly integrated with the developed CMS models and material science theories, are also discussed. Finally, the prospects for data-driven materials design based on the stability control of the dominant phases with regards to performance are proposed.

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“…In this respect, we spent over 10 years building up a specific database for Sm-Co systems, which contains both experimental and computational data for ∼1050 alloys published in the literature for decades, and some of them are used as references in this work. − ,,,− More importantly, we embedded in the database the related information search regarding composition, processing, microstructure, properties, and references of the material, which is unique from other material databases. The above specialized database may be considered as a “Materials Genome Initiative (MGI) , database of Sm-Co materials” according to its characteristics.…”

Section: Introductionmentioning

confidence: 99%

Selecting Doping Elements by Data Mining for Advanced Magnets

et al. 2019

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Compared with other material performances, magnetic properties are more closely related to the electronic structure and sensitive to the material composition. To date, no unified approach has been reported to understand the complicated influence of composition on a material’s magnetic properties. As one of the two most representative permanent magnetic systems, Sm-Co-based materials have been developed in terms of composition design mainly by empirical exploration. Taking advantage of a unique home-built Materials Genome Initiative database of Sm-Co systems, this work reports a data-driven material development that aims at high saturation magnetization, along with excellent comprehensive magnetic performance. A novel method using a unified “indicator” capable of precisely evaluating effects of doping elements on saturation magnetization was developed, and the priority of possible elements was predicted by extending the screening of elements to the periodic table, from which some elements that have never been tried in magnetic materials are discovered. By this approach, a top level of saturation magnetization was achieved in a series of prepared stoichiometric Sm-Co-based alloys, which also have high coercivity and high remanence in the same system. The strategy proposed here will be applicable on doping element selections for a large variety of material property modulations.

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Crystal structures and magnetic performance of nanocrystalline Sm-Co compounds

Cited by 14 publications

References 37 publications

Magnetic Nanoparticles: Synthesis, Anisotropy, and Applications

Magnetic Nanoparticles: Synthesis, Anisotropy, and Applications

Modelling of phase stability: integrating computational materials science and materials informatics

Selecting Doping Elements by Data Mining for Advanced Magnets

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