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An in situ preparation of smco 5 /sm 2 co 17 Method for core-shell structure two-phase composite magnetic nanoparticles

A technology of core-shell structure and composite magnetism, which is applied in the preparation/processing of rare earth metal compounds, nanotechnology, nanotechnology, etc., and can solve the problems of being unable to coat the SmCo magnetic phase phase shell, etc.

Active Publication Date: 2020-10-30
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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  • An in situ preparation of smco <sub>5</sub> /sm <sub>2</sub> co <sub>17</sub> Method for core-shell structure two-phase composite magnetic nanoparticles
  • An in situ preparation of smco <sub>5</sub> /sm <sub>2</sub> co <sub>17</sub> Method for core-shell structure two-phase composite magnetic nanoparticles
  • An in situ preparation of smco <sub>5</sub> /sm <sub>2</sub> co <sub>17</sub> Method for core-shell structure two-phase composite magnetic nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0034] 1) Get 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) Get 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-necked 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 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 3

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

[0051] 1) Get 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 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 minutes, pour o...

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PUM

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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 The core-shell structure biphasic composite magnetic nanoparticles 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 coll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/20B22F1/02C01G51/00C01F17/00C01F17/10B82Y30/00B82Y40/00
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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