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Method for preparing SmCo5/Sm2Co17 core-shell dual-phase composite magnetic nanoparticles in situ

A technology of core-shell structure and composite magnetism, which is applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problem that the SmCo magnetic phase phase shell cannot be coated

Active Publication Date: 2019-06-11
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is suitable for coating the magnetic phase of a single element, and the shell of the SmCo magnetic phase cannot be coated due to the inability to reduce the Sm element.

Method used

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  • Method for preparing SmCo5/Sm2Co17 core-shell dual-phase composite magnetic nanoparticles in situ
  • Method for preparing SmCo5/Sm2Co17 core-shell dual-phase composite magnetic nanoparticles in situ
  • Method for preparing SmCo5/Sm2Co17 core-shell dual-phase composite magnetic nanoparticles in situ

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] S1. Preparation of precursor SmCoCa-OH.

[0034] 1) Take a 250mL three-necked flask and place it in an ultrasonic water bath, and add SmCl with a purity of more than 99% to the three-necked flask 3 ·6H 2 O powder 0.54g, CoCl with a purity of 99.99% or more 2 ·6H 2 O powder 1.35g, CaCl with a purity of more than 99% 2 1.15g of particles, then add 100mL of deionized water into the three-necked flask, and start the mechanical stirring. After 10 minutes, turn on the ultrasonic instrument, and add 15 mL of 3.5 mol / L NaOH solution into the three-neck flask.

[0035] 2) After reacting for 1 hour, add 100-150 mL of deionized water to the reaction solution to dilute the solution, then transfer the solution to a centrifuge tube, centrifuge at a speed of 5000-8000 rpm for 3-5 minutes, pour off the supernatant and keep Precipitate in a centrifuge tube; add deionized water to the centrifuge tube, ultrasonically clean for 5 minutes, centrifuge at a speed of 5000-8000 rpm for 3-5...

Embodiment 2

[0043] S1. Preparation of precursor SmCoCa-OH.

[0044] 1) Take a 250mL three-necked flask and place it in an ultrasonic water bath, and add SmCl with a purity of more than 99% to the three-necked flask 3 ·6H 2 O powder 0.54g, CoCl with a purity of 99.99% or more 2 ·6H 2 O powder 1.35g, CaCl with a purity of more than 99% 2 1.54g of particles, then add 100mL of deionized water into the three-neck flask, and start the mechanical stirring. After 10 minutes, turn on the ultrasonic instrument, and add 18 mL of 3.5 mol / L NaOH solution into the three-necked flask.

[0045] 2) After reacting for 1 hour, add 100-150 mL of deionized water to the reaction liquid to dilute the solution, then transfer the solution to a centrifuge tube, centrifuge at a speed of 5000-8000 rpm for 3-5 minutes, pour off the supernatant and keep Precipitate in the centrifuge tube; add deionized water to the centrifuge tube, ultrasonically clean for 5 minutes, centrifuge at a speed of 5000-8000 rpm for 3-5...

Embodiment 3

[0050] S1. Preparation of precursor SmCoCa-OH.

[0051] 1) Take a 250mL three-necked flask and place it in an ultrasonic water bath, and add SmCl with a purity of more than 99% to the three-necked flask 3 ·6H 2 O powder 0.54g, CoCl with a purity of 99.99% or more 2 ·6H 2 O powder 1.35g, CaCl with a purity of more than 99% 2 2.31g of particles, then add 100mL of deionized water into the three-necked flask, and start the mechanical stirring. After 10 minutes, turn on the ultrasonic instrument, and add 24 mL of 3.5 mol / L NaOH solution into the three-necked flask.

[0052] 2) After reacting for 1 hour, add 100-150mL deionized water to the reaction liquid to dilute the solution, then transfer the solution to a centrifuge tube, centrifuge at a speed of 5000-8000 rpm for 3-5 minutes, pour off the supernatant and keep Precipitate in the centrifuge tube; add deionized water to the centrifuge tube, ultrasonically clean for 5 minutes, centrifuge at a speed of 5000-8000 rpm for 3-5 m...

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Abstract

The invention discloses a method for preparing SmCo5 / Sm2Co17 core-shell dual-phase composite magnetic nanoparticles in situ, which comprises the following steps: adding CaCl2 to prepare SmCoCa-OH andthen preparing the SmCo5 / Sm2Co17 core-shell composite magnetic nanoparticles by calcium thermal reduction reaction. The two phases are distributed in one particle in the form of core-shell structure.The two phases have strong exchange coupling and the material has high magnetic energy product.

Description

technical field [0001] This application relates to the technical field of magnetic material preparation, especially to SmCo 5 / Sm 2 co 17 In situ preparation method of core-shell structure biphasic composite magnetic nanoparticles. Background technique [0002] SmCo 5 / Sm 2 co 17 Two-phase composite magnetic nanoparticles with core-shell structure contain two phases, one of which is SmCo 5 , the other phase is Sm 2 co 17 . The magnetic properties of the two phases are compared to that of SmCo 5 Phase coercive force is larger, while Sm 2 co 17 The residual magnetization is higher. SmCo 5 / Sm 2 co 17 Two-phase composite magnetic particles require magnetic exchange coupling between the two phases. Under this effect, magnetic composite particles can have both SmCo 5 Relatively large coercivity and Sm 2 co 17 Relatively large residual magnetization. And, under strong exchange coupling, SmCo 5 / Sm 2 co 17 The second quadrant of the hysteresis loop will not co...

Claims

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Application Information

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IPC IPC(8): C01G51/00C01F17/00B82Y30/00B82Y40/00
Inventor 蒋成保董莹张天丽刘敬华王慧张明王敬东蔡明光
Owner BEIHANG UNIV
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