Magnetic properties of R-Nd-Fe-B (R = Tb, Dy) and Nd-Fe-Co-B Alloys in the Range -80 to 250°C

Кособудский, И. Д.; Sevost'yanov, V. P.; Kuznetsov, MV

doi:10.1007/bf02757958

Cited by 11 publications

(4 citation statements)

References 6 publications

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“…From a technical point of view, the Nd 2 Fe 14 B compound is congenitally deficient for operation at high temperatures because of its low Curie temperature (∼300 • C) and relatively low magnetocrystalline anisotropy. To compensate the strong temperature dependence of the coercivity of Nd 2 Fe 14 B-based magnets, a significant amount of heavy rare earths have to be added in order to use the magnets at temperatures above 100 • C [15,[20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. The gain from this doping becomes extraordinarily expensive: it makes Dy and Tb the most critical elements with very high and fluctuating market price for their unreliable supply [35].…”

Section: A Brief Historymentioning

confidence: 99%

Advances in nanostructured permanent magnets research

Poudyal¹,

Liu²

2012

J. Phys. D: Appl. Phys.

249

142

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This paper reviews recent developments in research in nanostructured permanent magnets (hard magnetic materials) with emphasis on bottom-up approaches to fabrication of hard/soft nanocomposite bulk magnets. Theoretical and experimental findings on the effects of soft phase and interface conditions on interphase exchange interactions are given. Synthesis techniques for hard magnetic nanoparticles, including chemical solution methods, surfactant-assisted ball milling and other physical deposition methods are reviewed. Processing and magnetic properties of warm compacted and plastically deformed bulk magnets with nanocrystalline morphology are discussed. Prospects of producing bulk anisotropic hard/soft nanocomposite magnets are presented.

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Section: A Brief Historymentioning

confidence: 99%

Advances in nanostructured permanent magnets research

Poudyal¹,

Liu²

2012

J. Phys. D: Appl. Phys.

249

142

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“…Various aspects of permanent magnets such as SmCo 5 , FePt, and RE 2 Fe 14 B (RE = Ce, Pr, Sm, Gd, Dy, Nd) have been investigated [1][2][3][4][5][6][7][8]. Especially, the Nd-Fe-B permanent magnet has the highest energy product (BH max ) and the largest coercivity among the permanent magnets and has been widely studied for applications for the motors in electric or hybrid vehicles.…”

Section: Introductionmentioning

confidence: 99%

Mössbauer studies of the N50 permanent magnet

Lim

Kim

et al. 2015

Journal of the Korean Physical Society

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The crystal and the magnetic properties of the N50 permanent magnet, which is widely used in industrial applications, have been studied by using x-ray diffractometer (XRD), vibrating sample magnetometer (VSM), and Mössbauer spectrometer. The crystal structure was determined to be tetragonal with a Nd-Fe-B structure. Based on the M -T curves, the values of spin reorientation temperature (TSR) and Curie temperature (TC ) were found to be 130 and 600 K, respectively. The Mössbauer spectra of N50 showed abrupt changes in the magnetic hyperfine field (H hf ) and the electric quadrupole shift (EQ) at temperatures around 130 K, indicating a spin reorientation (TSR). From the Mössbauer absorption area as a function of the square of the temperature for the N50 permanent magnet, the Debye temperature (ΘD) was found to be ΘD = 414.7 K.

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“…In recent years, RE 2 Fe 14 B (RE = Ce, Pr, Sm, Gd, Dy, Nd) magnets based on rare-earth (RE) metals have been extensively studied as key components in industrial applications such as motors in electric or hybrid vehicles due to their high coercivity, high magnetic remanence, and high value of energy product (BH max ) [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the magnetic properties of Dy doped Nd-Fe-B permanent magnet by using Mössbauer spectroscopy

Lim

Kim

et al. 2015

Journal of the Korean Physical Society

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The crystal and the magnetic properties of (Nd35.00−xDyx)Fe bal. Cu0.15Co1.50Al0.20Nb0.35B1.00 (wt.%; x = 3.50, 6.00, and 8.00) samples are investigated by using x-ray diffractometer (XRD), vibrating smple magnetometer (VSM), and Mössbauer spectrometer. The crystal structure is determined to be tetragonal with the P 42/mnm space group. The saturation magnetization (Ms) decreases while the coercivity (Hc) increases with increasing Dy ion concentration. Based on the zero-filed-cooled (ZFC) curves, all the samples show spin reorientation, and the spin-reorientation temperature TSR decreases with increasing Dy ion concentration. The Mössbauer spectra measured at 295 K show decreasing < H hf > with increasing Dy concentration, and the abrupt changes both in the magnetic hyperfine field (H hf ) and the electric quadrupole shift (EQ) at temperatures around TSR.

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Magnetic properties of R-Nd-Fe-B (R = Tb, Dy) and Nd-Fe-Co-B Alloys in the Range -80 to 250°C

Cited by 11 publications

References 6 publications

Advances in nanostructured permanent magnets research

Advances in nanostructured permanent magnets research

Mössbauer studies of the N50 permanent magnet

Investigation of the magnetic properties of Dy doped Nd-Fe-B permanent magnet by using Mössbauer spectroscopy

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