Effect of boron additions on phase formation and magnetic properties of TbCu7-type melt spun SmFe ribbons

Zheng, Chuanjiang; Yu, Dunji; Li, Kuoshe; Luo, Yang; Jin, Jinling; Lu, Shuo; Li, Hongwei; Mao, Yongjun; Quan, Ning-Tao

doi:10.1016/j.jmmm.2016.03.082

Cited by 16 publications

(4 citation statements)

References 21 publications

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“…The deviation from the 1/5 stoichiometry strongly influences the magnetic properties of these compounds. For a higher stoichiometry deviation, (

), the structure has been described as TbCu

[ 63 , 64 , 65 , 66 ].…”

Section: Structure Analysismentioning

confidence: 99%

“…In this case, the precursor phase belongs to the

space group. For the Sm–Fe binary system, the SmFe

phase does not exist and the stoichiometry of the Sm

phase precursor has been described as SmFe

[ 23 , 29 ] and, very recently, using synchrotron resonant diffraction (SOLEIL), the stoichiometry of this phase has been definitely found as SmFe

[ 62 ] whereas it was considered in previous publications as TbCu

[ 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 ].…”

Section: Structure Analysismentioning

confidence: 99%

“…The TbCu

designation (phase that can exist) attributed to the SmFe

[ 65 , 67 , 72 ] (phase that cannot exist [ 73 ]) adds an additional difficulty to understand the structure of these non-equilibrium phases.…”

Section: Structure Analysismentioning

confidence: 99%

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Structure and Magnetic Properties of Intermetallic Rare-Earth-Transition-Metal Compounds: A Review

Bessaïs

2021

Materials

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This review discusses the properties of candidate compounds for semi-hard and hard magnetic applications. Their general formula is R1−sT5+2s with R = rare earth, T = transition metal and 0≤s≤0.5 and among them, the focus will be on the ThMn12- and Th2Zn17-type structures. Not only will the influence of the structure on the magnetic properties be shown, but also the influence of various R and T elements on the intrinsic magnetic properties will be discussed (R = Y, Pr, Nd, Sm, Gd, … and T = Fe, Co, Si, Al, Ga, Mo, Zr, Cr, Ti, V, …). The influence of the microstructure on the extrinsic magnetic properties of these R–T based intermetallic nanomaterials, prepared by high energy ball milling followed by short annealing, will be also be shown. In addition, the electronic structure studied by DFT will be presented and compared to the results of experimental magnetic measurements as well as the hyperfine parameter determined by Mössbauer spectrometry.

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“…The deviation from the 1/5 stoichiometry strongly influences the magnetic properties of these compounds. For a higher stoichiometry deviation, (

), the structure has been described as TbCu

[ 63 , 64 , 65 , 66 ].…”

Section: Structure Analysismentioning

confidence: 99%

“…In this case, the precursor phase belongs to the

space group. For the Sm–Fe binary system, the SmFe

phase does not exist and the stoichiometry of the Sm

phase precursor has been described as SmFe

[ 23 , 29 ] and, very recently, using synchrotron resonant diffraction (SOLEIL), the stoichiometry of this phase has been definitely found as SmFe

[ 62 ] whereas it was considered in previous publications as TbCu

[ 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 ].…”

Section: Structure Analysismentioning

confidence: 99%

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Structure and Magnetic Properties of Intermetallic Rare-Earth-Transition-Metal Compounds: A Review

Bessaïs

2021

Materials

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“…These properties are often used to produce soft, hard, or semi-hard magnetic materials [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. The origin of these exceptional magnetic properties is particularly due to the coexistence of of two complementary kinds of magnetism: the localized magnetism characteristic of rare-earth (R) electrons and the itinerant magnetism of the 3d electrons of transition metals (T), such as cobalt (Co) and iron (Fe) [24][25][26][27][28][29][30][31][32][33]. The R elements thus provide their strong magnetocrystalline anisotropy (H a ) due to the interactions between their orbital moment and the crystal field.…”

Section: Introductionmentioning

confidence: 99%

Influence of Chemical Substitution and Light Element Insertion on the Magnetic Properties of Nanocrystalline Pr2Co7 Compound

2022

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It is well recognized that intermetallics based on rare-earth (R) and transition metals (T) display numerous interesting magnetic properties, leading to potential applications in different fields. The latest progress regarding magnetic properties and the magnetocaloric effect (MCE) in the nanostructured Pr2Co7 compound, as well as its carbides and hydrides, is reviewed in this paper. Some of this progress reveals remarkable MCE performance, which makes it attractive in the field of magnetic refrigeration at high temperatures. With the purpose of understanding the magnetic and magnetocaloric characteristics of these compounds, the crystal structure, microstructure, and magnetism are also brought into focus. The Pr2Co7 compound has interesting magnetic properties, such as a high Curie temperature TC and uniaxial magnetocrystalline anisotropy. It crystallizes in a hexagonal structure (2:7 H) of the Ce2Ni7 type and is stable at relatively low temperatures (Ta≤ 1023 K), or it has a rhombohedral structure (2:7 R) of the Gd2Co7 type and is stable at high temperatures (Ta≥ 1223 K). Studies of the magnetocaloric properties of the nanocrystalline Pr2Co7 compound have shown the existence of a large reversible magnetic entropy change (ΔSM) with a second-order magnetic transition. After its substitution, we showed that nanocrystalline Pr2Co7−xFex compounds that were annealed at Ta = 973 K crystallized in the 2:7 H structure similarly to the parent compound. The extended X-ray absorption fine-structure (EXAFS) spectra adjustments showed that Fe atoms preferably occupy the 12k site for x ≤ 1. The study of the magnetic properties of nanocrystalline Pr2Co7−xFex compounds revealed an increase in TC of about 26% for x = 0.5, as well as an improvement in the coercivity, Hc (12 kOe), and the (BH)max (9 MGOe) product. On the other hand, the insertion of C atoms into the Pr2Co7 cell led to a marked improvement in the TC value of 21.6%. The best magnetic properties were found for the Pr2Co7C0.25 compound annealed at 973 K, Hc = 10.3 kOe, and (BH)max = 11.5 MGOe. We studied the microstructure, hydrogenation, and magnetic properties of nanocrystalline Pr2Co7Hx hydrides. The crystal structure of the Pr2Co7 compound transformed from a hexagonal (P63/mmc) into an orthorhombic (Pbcn) and monoclinic (C2/c) structure during hydrogenation. The absorption of H by the Pr2Co7 compound led to an increase in the TC value from 600 K at x = 0 to 691 K at x = 3.75. The Pr2Co7H0.25 hydride had optimal magnetic properties: Hc = 6.1 KOe, (BH)max = 5.8 MGOe, and TC = 607 K. We tailored the mean field theory (MFT) and random magnetic anisotropy (RMA) methods to investigate the magnetic moments, exchange interactions, and magnetic anisotropy properties. The relationship between the microstructure and magnetic properties is discussed. The obtained results provide a fundamental reference for adapting the magnetic properties of the Pr2Co7, Pr2Co6.5Fe0.5, Pr2Co7C0.25, and Pr2Co7H0.25 compounds for potential permanent nanomagnets, high-density magnetic recording, and magnetic refrigeration applications.

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Microstructural and Magnetic Characteristics of Nanocrystalline Sm₄ZrFe₃₃ Alloys

Fersi,

Dalia

2024

Physica Status Solidi (a)

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This work focuses on the study of the microstructure and magnetic properties of nanocrystalline powders of Sm4ZrFe33, prepared by high‐energy ball milling. The Sm4ZrFe33 compound adopts a monoclinic structure (space group Cm). Upon annealing, these Sm4ZrFe33 samples exhibit notable variations in their extrinsic magnetic properties, closely linked to temperature fluctuations. The investigation delves into the correlation between morphology, grain size and magnetic characteristics. A significant enhancement in coercivity (Hc), remanent magnetization (Mr), and maximum energy product ((BH)max) is observed, primarily attributed to the finer grain structure present in the samples. Particularly noteworthy, among all annealed specimens, the nanocrystalline Sm4ZrFe33 compound annealed at a temperature of Ta = 973 K demonstrates the most promising magnetic properties. This specimen exhibits a coercivity Hc of 18 500 Oe, remanent magnetization (Mr) of 58 emu g−1, maximum energy product ((BH)max) of 5.18 MGOe, Curie temperature (TC) of ≈804 K, and magnetic anisotropy field (Ha) of 115 980 Oe. These research findings pave the way for future investigations and applications in the realm of permanent magnets, spintronic devices, and magnetic recording, utilizing nanocrystalline alloys based on the Sm4ZrFe33 compound.

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Effect of boron additions on phase formation and magnetic properties of TbCu7-type melt spun SmFe ribbons

Cited by 16 publications

References 21 publications

Structure and Magnetic Properties of Intermetallic Rare-Earth-Transition-Metal Compounds: A Review

Structure and Magnetic Properties of Intermetallic Rare-Earth-Transition-Metal Compounds: A Review

Influence of Chemical Substitution and Light Element Insertion on the Magnetic Properties of Nanocrystalline Pr2Co7 Compound

Microstructural and Magnetic Characteristics of Nanocrystalline Sm₄ZrFe₃₃ Alloys

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Effect of boron additions on phase formation and magnetic properties of TbCu7-type melt spun SmFe ribbons

Cited by 16 publications

References 21 publications

Structure and Magnetic Properties of Intermetallic Rare-Earth-Transition-Metal Compounds: A Review

Structure and Magnetic Properties of Intermetallic Rare-Earth-Transition-Metal Compounds: A Review

Influence of Chemical Substitution and Light Element Insertion on the Magnetic Properties of Nanocrystalline Pr2Co7 Compound

Microstructural and Magnetic Characteristics of Nanocrystalline Sm4ZrFe33 Alloys

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Product

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Microstructural and Magnetic Characteristics of Nanocrystalline Sm₄ZrFe₃₃ Alloys