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Iron-based nanoparticles and grains

A nanoparticle, iron-based technology, applied in the fields of nanomagnetism, nanotechnology, nanotechnology, etc., can solve problems such as difficulty in manufacturing

Active Publication Date: 2019-07-30
RGT UNIV OF MINNESOTA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Fe 16 N 2 Phase is Fe 8 Ordered form of N with large anisotropy constant and saturation magnetization, but difficult to fabricate

Method used

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  • Iron-based nanoparticles and grains
  • Iron-based nanoparticles and grains
  • Iron-based nanoparticles and grains

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Using the equation H C =H S (1-P) Calculate Fe for changing particle size 16 N 2 Coercivity H of ellipsoidal particles C . The shape anisotropy H S =4π·ΔN·M S , where M S is the saturation magnetization (Fe 16 N 2 is 200emu / g). ΔN=N a -N c is the difference in demagnetization factor between the longitudinal and transverse directions of the particle. The packing factor P=0.52 for a compact simple cubic packed ellipsoid. The coercive force depends on the ratio of the particle length (c) to the particle diameter (a), as shown in Table 1.

[0093] Table 1

[0094] c / a ΔN h S (Oe)

Embodiment 2

[0096] For varying particle sizes, Fe including a nonmagnetic shell of thickness h is calculated using the equation 16 N 2 Coercivity H of ellipsoidal particles C , where a, b, and c are the three ellipsoid diameters. The fill factor P is calculated using Equation 1.

[0097] Formula 1

[0098] The coercivity depends on a, b, c and h as shown in Table 2.

[0099] Table 2

[0100]

Embodiment 3

[0102] Through the ellipsoidal Fe 16 N 2 The core-shell nanoparticles of the examples were fabricated by sputtering an antiferromagnetic MnN shell on the core. The magnetization behavior of the example core-shell nanoparticles was investigated. Figure 9 is a schematic illustration for containing Fe 16 N 2 Hysteresis loop plot of the magnetization versus the applied magnetic field at room temperature for example nanoparticles of core and MnN shell. A relatively high coercive force of about 1605 Oe is achieved.

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Abstract

Example nano particles may include an iron-based core, and a shell. The shell may include a non-magnetic, anti-ferromagnetic, or ferromagnetic material. Example alloy compositions may include an iron-based grain, and a grain boundary. The grain boundary may include a non-magnetic, anti-ferromagnetic, or ferromagnetic material. Example techniques for forming iron-based core-shell nano particles mayinclude depositing a shell on an iron-based core. The depositing may include immersing the iron-based core in a salt composition for a predetermined period of time. The depositing may include millingthe iron-based core with a salt composition for a predetermined period of time. Example techniques for treating a composition comprising core-shell nano particles may include nitriding the composition.

Description

technical field [0001] The present disclosure relates to iron-based nanoparticles and grains and techniques for forming iron-based nanoparticles and grains. Background technique [0002] Permanent magnets play a role in many electromechanical systems, including, for example, alternative energy systems. For example, permanent magnets are used in sensors, actuators, electric motors or generators, which can be used in vehicles, wind turbines and other alternative energy mechanisms. Many permanent magnets in use today include rare earth elements, such as neodymium, which lead to high energy products. These rare earth elements are relatively in short supply and may face price increases and / or supply shortages in the future. Additionally, some permanent magnets containing rare earth elements are expensive to manufacture. For example, the manufacture of NdFeB and ferrite magnets typically involves crushing the material, pressing the material, and sintering at temperatures in exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/00H01F1/04H01F7/02H01F41/02
CPCH01F1/0054H01F1/065B22F9/20B82Y25/00B22F2999/00C22C2202/02B22F1/0553B22F1/0547B22F1/054B22F1/16B22F2201/013B22F2201/02B22F2202/05B22F9/04B22F2301/35B22F2302/20B22F2304/054C23C8/26C23C8/50C23C8/80H01F1/0551H01F1/059H01F1/0552C22C38/00C22C38/001C22C38/10H01F1/061B22F1/06
Inventor 王建平马斌刘金铭武义明姜岩峰
Owner RGT UNIV OF MINNESOTA