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.
CN109867310BActive Publication Date: 2020-10-30BEIHANG UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2020-10-30

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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.
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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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