Pressure-induced magnetic transition in Nd2Fe14B based on two-sublattice model

Liu, Feng; Xu, Shuo; Wang, Lihua

doi:10.1007/s12598-018-1192-x

Cited by 8 publications

(3 citation statements)

References 42 publications

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“…Nd 2 Fe 14 B is prepared in a manner similar to SmCo 5 , in which oxide precursors are reduced and transformed. 75 Notably, the saturated vapor pressure of Nd is higher than that of Sm, necessitating the addition of additional Nd 2 O 3 to the precursor to compensate for the loss of Nd element during the evaporation process. 76 Current research findings on Nd 2 Fe 14 B-based permanent magnet materials are presented in Table 3, demonstrating that the selection of appropriate dispersants can effectively alter the kinetics of the reduction–diffusion reaction and optimize the crystal size of Nd 2 Fe 14 B.…”

Section: Elementary Rare Earthsmentioning

confidence: 99%

Sustainability applications of rare earths from metallurgy, magnetism, catalysis, luminescence to future electrochemical pseudocapacitance energy storage

et al. 2023

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Section: Elementary Rare Earthsmentioning

confidence: 99%

Sustainability applications of rare earths from metallurgy, magnetism, catalysis, luminescence to future electrochemical pseudocapacitance energy storage

et al. 2023

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“…H. Sepehri-Amin [19] , P.M. Tarini [20] studied the change law of magnetic properties of sintered NdFeB under a temperature field and analyzed the coercive force mechanism of Nd-Fe-B magnets under a temperature field based on the micromagnetic simulation method. Bao et al [21], Huang et al [22], Lu et al [23] and Li et al [24] studied the magnetization reversal law of NdFeB under a temperature field based on the micromagnetic simulation method; they measured the effect of the demagnetization field on the demagnetization process of NdFeB. The demagnetization process of single crystal and polycrystalline NdFeB was compared and analyzed, and the result showed that polycrystalline NdFeB had a strong pinning effect during the demagnetization process; high temperature would greatly weaken this effect.…”

Section: Introductionmentioning

confidence: 99%

Thermal Demagnetization Characteristics of NdFeB Used in Eddy Current Dampers

Yang,

Li,

Zhang

2024

IEEE Access

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With continuously improving NdFeB magnetic properties, eddy current dampers using NdFeB materials as energy sources can be used in places with high energy consumption densities. However, the magnetic properties of NdFeB are greatly threatened by the increase in temperature, and the demagnetization process of NdFeB remains unclear. To comprehend demagnetization due to temperature increases in the working environment, this study reproduces the microscopic demagnetization process of NdFeB under high temperatures using the micromagnetic numerical simulation method. The demagnetization mechanism of NdFeB at different temperatures is analyzed using micromagnetic calculations, and the hysteresis phenomenon of NdFeB is explained accordingly. To quantify the demagnetization phenomenon of NdFeB in engineering practice, it is crucial to mathematically express its demagnetization behavior at different temperatures. We used the Jiles-Atherton (J-A) model, frequently used in ferromagnetic materials, to describe the demagnetization process. Next, a dynamic hysteresis experiment of NdFeB is conducted to validate the accuracy of the J-A model in expressing the magnetic properties. Finally, considering the artillery launch as a typical engineering case, the demagnetization and resistance drop calculation of the eddy current damper due to the heating of the permanent magnet during the launch process is performed. Results imply that under the worst working conditions, the maximum demagnetization amount of NdFeB is 0.351 T, and the maximum recoil displacement of the damper is 1,108 mm, theoretically supporting the design of the eddy current damper.

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“…Li et al [6] believed that the sliding or fracture of the Nd rich phase under impact was the main reason for the demagnetization of sintered NdFeB. Lu et al [7] analyzed the magnetism of sintered NdFeB magnets under high pressure.…”

Section: Introductionmentioning

confidence: 99%

Demagnetization properties study on NdFeB permanent magnets under impact load

Liu,

Yang,

2023

J. Phys.: Conf. Ser.

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Sintered NdFeB materials are more and more widely used in the military field because of their excellent magnetic field performance and cost performance. The demagnetization of materials caused by the impact was discussed in this paper to provide a theoretical basis for the application of NdFeB. Firstly, the experimental platform for the demagnetization of material under impact was built, and the corresponding load of impact was calibrated by using the thin-film piezoelectric sensor. In the experiment, the changes in the magnetic field were converted into an electrical signal that was easy to observe. The curves for the changes of the induced electromotive force and magnetic flux were obtained under different velocities of impact. Then, a new impact demagnetization model was proposed combined with the experimental results and the demagnetization process of sintered NdFeB materials under an external magnetic field. The model was based on the stress knee-point hypothesis and irreversible deterioration hypothesis. Finally, the co-simulation model was established in this paper, and the identified parameters were substituted into the model for numerical calculation. The validity of the model and the accuracy of parameter selection were verified by comparing the calculation results with the experimental results.

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Pressure-induced magnetic transition in Nd2Fe14B based on two-sublattice model

Cited by 8 publications

References 42 publications

Sustainability applications of rare earths from metallurgy, magnetism, catalysis, luminescence to future electrochemical pseudocapacitance energy storage

Sustainability applications of rare earths from metallurgy, magnetism, catalysis, luminescence to future electrochemical pseudocapacitance energy storage

Thermal Demagnetization Characteristics of NdFeB Used in Eddy Current Dampers

Demagnetization properties study on NdFeB permanent magnets under impact load

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