An alternative approach to the finely crystalline powder of rare earth-transition metal alloys

Su, Mian-Zeng; Liu, S.F.; Qian, Xin; Lin, Jianhua

doi:10.1016/s0925-8388(96)02748-x

Cited by 19 publications

(9 citation statements)

References 7 publications

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“…200 500 700 1010 3–8 – – – – – [ 98 ] NdFe 10 Mo 2 N [Fe 2 O 3 ,NdFeO 3 ,Fe 2 (MoO 4 ) 3 ] ca . 200 500 700 1010 (550–600 ②* ) 3–8 360 – – – 0.35 [ 131 ] NdFe 10 Mo 2 [Fe 2 O 3 ,Nd 2 O 3 ,MoO 3 ,TiO 2 ] – 500 700–800 1100 (550–600 ②* ) – 453 65 – – – [ 135 , 136 ] NdFe 10 Mo 2 H x 478 91 – – – NdFe 10 Mo 2 N x 553 92 7.2 – – NdFe 10.25 Mo 1.5 Ti 0.25 483 …”

Section: Synthesis Of Multielement R–t Mmpsmentioning

confidence: 99%

Section: Synthesis Of Multielement R–t Mmpsmentioning

confidence: 99%

“…The particle size of the oxide NPs was crucial in controlling the particle size of NdFe 10 Mo 2 MMPs: the CaH 2 R–D reaction could be carried out at lower temperatures ( e.g ., 960°C) and for a short time for the smaller oxide NPs ( ca . 50 nm), resulting in smaller NdFe 10 Mo 2 MMPs [ 98 , 131 ]. The nitridation of NdFe 11 Ti was conducted using the same procedure for the synthesis of Sm 2 Fe 17 N 3 , as described in Section 3.1 , but at higher temperatures (550–600°C).…”

Section: Synthesis Of Multielement R–t Mmpsmentioning

confidence: 99%

“…As a result, the NdFe 10 Mo 2 N MMPs ( ca . 3–8 μm) exhibited a room-temperature of 0.35 T [ 131 ]. The method has been successfully applied to synthesize a series of ternary, quaternary, and quinary R(Fe,M) 12 X (R = Nd, Y, Nb, Tb, Er; M = Ti, Mo, W, Si; X = N, H) MMPs, as shown in Table 1 [ 131–136 ].…”

Section: Synthesis Of Multielement R–t Mmpsmentioning

confidence: 99%

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Synthesis of mesoscopic particles of multi-component rare earth permanent magnet compounds

Trinh

Kim

Sato

et al. 2021

Science and Technology of Advanced Materials

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Multielement rare earth (R)–transition metal (T) intermetallics are arguably the next generation of high-performance permanent magnetic materials for future applications in energy-saving and renewable energy technologies. Pseudobinary Sm 2 Fe 17 N 3 and (R,Zr)(Fe,Co,Ti) 12 (R = Nd, Sm) compounds have the highest potential to meet current demands for rare-earth-element-lean permanent magnets (PMs) with ultra-large energy product and operating temperatures up to 200°C. However, the synthesis of these materials, especially in the mesoscopic scale for maximizing the maximum energy product ( ), remains a great challenge. Nonequilibrium processes are apparently used to overcome the phase-stabilization challenge in preparing the R–T intermetallics but have limited control of the material’s microstructure. More radical bottom-up nanoparticle approaches based on chemical synthesis have also been explored, owing to their potential to achieve the desired composition, structure, size, and shape. While a great achievement has been made for the Sm 2 Fe 17 N 3 , progress in the synthesis of (R,Zr)(Fe,Co,Ti) 12 magnetic mesoscopic particles (MMPs) and R–T/T exchange-coupled nanocomposites (NCMs) with substantial coercivity ( ) and remanence ( , respectively, remains marginal.

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Section: Synthesis Of Multielement R–t Mmpsmentioning

confidence: 99%

Section: Synthesis Of Multielement R–t Mmpsmentioning

confidence: 99%

Section: Synthesis Of Multielement R–t Mmpsmentioning

confidence: 99%

Section: Synthesis Of Multielement R–t Mmpsmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of mesoscopic particles of multi-component rare earth permanent magnet compounds

Trinh

Kim

Sato

et al. 2021

Science and Technology of Advanced Materials

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“…Indeed, a superior (BH) max value was recently obtained in submicron Sm(Fe,Co,Ti) 12 particles prepared this way [21]. Somewhat larger Nd(Fe,Mo) 12 particles prepared via reduction-diffusion of chemically synthesized 3 precursors showed a noticeable H c after subsequent nitrogenization [22]. Importantly, the (removable) byproducts of the reduction as well as the often-added (removable) dispersant may not only keep the synthesized particle apart, but also restrict their growth, thus mitigating the detrimental effect of a high synthesis temperature on the H c .…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical synthesis of magnetically hard anisotropic RFe10Si2 powders with R representing combinations of Sm, Ce and Zr

Gabay

Hadjipanayis

2017

Journal of Magnetism and Magnetic Materials

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Alloy synthesis consisting of mechanical activation followed by annealing was explored as a method of manufacturing medium-grade permanent magnet materials with a reduced content of the critical rare earth elements. Four R x Fe 10 Si 2 alloys with R = Sm, Sm 0.7 Zr 0.3 , Sm 0.3 Ce 0.3 Zr 0.4 and Ce 0.6 Zr 0.4 (nominal compositions) were prepared from mixtures of Sm 2 O 3 , CeO 2 , ZrO 2 , Fe 2 O 3 and Si powders in the presence of a reducing agent Ca and a CaO dispersant. The collected alloy particles typically consisted of few joined submicron crystals. For R = Sm, X-ray diffraction analysis reveals a significant amount of the unwanted Th 2 Zn 17 -type compound forming alongside the desired ThMn 12 -type 1:12 compound. A more pure 1:12 phase could be obtained for R = Ce 0.6 Zr 0.4 , but it exhibited a room-temperature coercivity of less than 1 kOe. The most pure 1:12 phase and the highest values of the coercivity (10.8 kOe) and calculated maximum energy product (13.8 MGOe) were obtained for R = Sm 0.7 Zr 0.3 processed at 1150 °C. The calculated maximum energy products of the Sm 0.3 Ce 0.3 Zr 0.4 Fe 10 Si 2 particles, with half of their rare earths constituents represented by the relatively abundant Ce, was 10.1 MGOe.

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Origin of coercivity in an anisotropic Sm(Fe,Ti,V)12-based sintered magnet

et al. 2021

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An alternative approach to the finely crystalline powder of rare earth-transition metal alloys

Cited by 19 publications

References 7 publications

Synthesis of mesoscopic particles of multi-component rare earth permanent magnet compounds

Synthesis of mesoscopic particles of multi-component rare earth permanent magnet compounds

Mechanochemical synthesis of magnetically hard anisotropic RFe10Si2 powders with R representing combinations of Sm, Ce and Zr

Origin of coercivity in an anisotropic Sm(Fe,Ti,V)12-based sintered magnet

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