Structure and magnetic properties of (Sm,Ho)2Fe17Nx (x = 0; 2.4)

Веселова, С. В.; Терешина, И. С.; Verbetsky, V.N.; Neznakhin, D. S.; Tereshina-Chitrova, E. A.; Kaminskaya, T. P.; Karpenkov, A. Yu.; Akimova, Olga A.; Gorbunov, D. I.; Savchenko, A. G.

doi:10.1016/j.jmmm.2020.166549

Cited by 12 publications

(6 citation statements)

References 38 publications

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“…The true values of the saturation magnetization for the hard magnetic phase 2: 17 in each sample are given in parentheses, calculated by the formula (1) (see Ref. [8]). As can be seen from Table 2, the saturation magnetization values for the nitrided sample are 16% higher than those for the starting compound Sm1.8Er0.2Fe17, which is consistent with the known literature data for Sm2Fe17 and its nitrides Sm2Fe17Nу [22].…”

Section: Resultsmentioning

confidence: 99%

“…Sample Sm1.8Er0.2Fe17 was obtained in an argon atmosphere by induction melting from starting metals with a purity of at least 99.9%, followed by annealing in vacuum at 1273 K for 120 hours. The synthesis of nitride Sm1.8Er0.2Fe17N2.1 was carried out using the technology of hydride dispersion similar to the procedure used for nitriding (Sm,Ho)2Fe17 and described in detail in [8,21]. X-ray diffraction studies of all synthesized samples were carried out on a DRON-3M diffractometer in Kα-radiation of cobalt.…”

Section: Methodsmentioning

confidence: 99%

“…It was shown in Refs [4][5][6] that the study of the effect of partial substitution, both in the sublattice of rare-earth metals and in iron sublattice, on the structure and magnetic properties of R2Fe17 is of great interest among researchers. In addition, as a result of nitriding of the intermetallic compounds Sm2Fe17-type, an increase in the parameters of the crystal lattice is observed while maintaining the structure [7][8][9][10][11][12]. Due to changes in the electronic and magnetic structures caused by the bulk and chemical effects upon the introduction of light interstitial atoms, a significant modification of important magnetic hysteresis properties occurs [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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The Structure and Magnetic Properties of (Sm,Er)-Fe-N Powders Prepared by Ball Milling

Терешина

Веселова

Щетинин

et al. 2022

KEM

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Nitrides of ‘2:17’ - type based on rare earth metals and iron are of interest as promising magnetic materials for the development of high-energy permanent magnets. The magnetic properties and phase composition of the starting compound Sm1.8Er0.2Fe17, nitride Sm1.8Er0.2Fe17N2.1 and its crushed powders have been investigated. The magnetic measurements of the samples were studied in magnetic fields up to 70 kOe at room temperature. It was found that the introduction of nitrogen atoms into the crystal lattice of the substituted composition (Sm,Er)2Fe17 in combination with the effect of high-energy milling of nitride leads to an increase in the saturation magnetization (σS) and coercive force (HC).

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Structure and Magnetic Properties of (Sm,Er)-Fe-N Powders Prepared by Ball Milling

Терешина

Веселова

Щетинин

et al. 2022

KEM

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“…For Er2Fe17, Sm1.8Er0.2Fe17, Sm1.2Er0.8Fe17 samples and their nitrides Er2Fe17N2, Sm1.8Er0.2Fe17N2.1, Sm1.2Er0.8Fe17N2 details of preparation and certification can be found in Refs. [15][16][17]. The milling process was conducted at room temperature using a high-energy ball mill by Planetary Mono Mill PULVERISETTE 6 (Fritsch, Germany) with the diameter of the stainless-steel balls of 6.5 mm.…”

Section: Methodsmentioning

confidence: 99%

Comparative High-Field Magnetization Study of (Sm,Er)2Fe17 and Er2Fe17 Compounds and their Nitrides

Ivanov

Paukov

Терешина

et al. 2021

MSF

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Magnetic properties of the R2Fe17 compounds are sensitive to the atomic substitutions and interstitial absorption of nitrogen. In our work, both were combined and their effect on the magnetization behavior of Er2Fe17 compound in magnetic fields up to 58 T was studied. Er2Fe17N2, Sm1.2Er0.8Fe17N2 and Sm1.8Er0.2Fe17N2.1 nitrides were prepared. Magnetization measurements were carried out, mainly on powder samples (excluding Er2Fe17 single crystal). Nanopowders of Sm1.2Er0.8Fe17N2 were obtained by mechanical grinding. The grinding time was varied from 0 to 60 minutes. The strength of the inter-sublattice coupling in samples is estimated by analyzing high-field magnetization data.

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“…In recent years, magnetic nanomaterials based on rare-earth elements (R) and transition metals (T) have been widely investigated due to their extremely diverse potential applications in industrial fields [1][2][3][4][5][6][7][8]. 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].…”

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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Structure and magnetic properties of (Sm,Ho)2Fe17Nx (x = 0; 2.4)

Cited by 12 publications

References 38 publications

The Structure and Magnetic Properties of (Sm,Er)-Fe-N Powders Prepared by Ball Milling

The Structure and Magnetic Properties of (Sm,Er)-Fe-N Powders Prepared by Ball Milling

Comparative High-Field Magnetization Study of (Sm,Er)<sub>2</sub>Fe<sub>17</sub> and Er<sub>2</sub>Fe<sub>17</sub> Compounds and their Nitrides

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

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