Magnetic refrigeration material, preparation method and application thereof

A technology of magnetic refrigeration materials and polycrystalline materials, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of long cycle and high energy consumption, and achieve short reaction cycle, low energy consumption, and simple preparation process Effect

Active Publication Date: 2021-06-25
JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this crystal preparation process also has the problems of long cycle time and high energy consumption. It needs to be crystallized at 180°C for 7 days in a stainless steel high-pressure reaction vessel with a polytetrafluoroethylene reactor to obtain crystals with good crystallinity.

Method used

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  • Magnetic refrigeration material, preparation method and application thereof
  • Magnetic refrigeration material, preparation method and application thereof
  • Magnetic refrigeration material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] This embodiment provides a method for preparing a magnetic refrigeration material, the preparation method comprising the following steps:

[0070] (1) Weigh LiF and GdF according to the ratio of the amount of substances to 1:1 3 , grind to obtain a mixture with an average particle size of 100 μm;

[0071] (2) Put the mixture described in step (1) into the first crucible made of corundum, and cover the lid of the first crucible;

[0072] (3) The first crucible is put into the second crucible made of graphite, the outside of the first crucible is covered with graphite with an average particle size of 100 μm, and the lid of the second crucible is covered;

[0073] (4) The second crucible was placed in a tube furnace, and sintered at 1200° C. for 10 minutes under an argon atmosphere to obtain a magnetic refrigeration material.

Embodiment 2

[0075] This embodiment provides a method for preparing a magnetic refrigeration material, the preparation method comprising the following steps:

[0076] (1) Weigh LiF and GdF according to the ratio of the amount of substances to 1.8:1 3 , ball milled to obtain a mixture with an average particle size of 50 μm;

[0077] (2) Put the mixture described in step (1) into the first crucible made of boron nitride, and cover the lid of the first crucible;

[0078] (3) The first crucible is put into the second crucible made of corundum, the outside of the first crucible is covered with carbon black with an average particle size of 500 μm, and the lid of the second crucible is covered;

[0079] (4) The second crucible was placed in a muffle furnace, and sintered at 1000° C. for 40 minutes in an air atmosphere to obtain a magnetic refrigeration material.

Embodiment 3

[0081] This embodiment provides a method for preparing a magnetic refrigeration material, the preparation method comprising the following steps:

[0082] (1) Weigh LiF and GdF according to the ratio of the amount of substances to 1.4:1 3 Powder, mixed to obtain a mixture with an average particle size of 100 μm;

[0083] (2) Put the mixture described in step (1) into the first crucible made of graphite, and cover the lid of the first crucible;

[0084] (3) The first crucible is put into the second crucible made of zirconia, the outside of the first crucible is covered with activated carbon with an average particle size of 200 μm, and the lid of the second crucible is covered;

[0085] (4) The second crucible was placed in a vacuum furnace, and sintered at 800° C. for 60 min in a nitrogen atmosphere to obtain a magnetic refrigeration material.

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Abstract

The invention provides a magnetic refrigeration material, a preparation method and application thereof. According to the invention, the magnetic refrigeration material comprises LiGdF4, and has a very strong magnetocaloric effect at a low temperature, wherein the maximum magnetic entropy change of the magnetic refrigeration material under 0-5T magnetic field change at a temperature of 2.5 K is less than or equal to 58 J.kg<-1>.K<-1>, so that the magnetic refrigeration material is excellent in performance; and the magnetic refrigeration material is prepared from LiF and GdF3 through a solid-phase reaction without harmful substances such as acid or alkali, and the like polluting the environment, is simple in preparation process ad short in period, is suitable for large-scale industrial production, and has wide application prospects in the fields of low-temperature physics, space exploration, aerospace and the like.

Description

technical field [0001] The invention relates to the technical field of magnetic refrigeration materials, in particular to a magnetic refrigeration material and its preparation method and application. Background technique [0002] When ferromagnetic or paramagnetic materials change in the external magnetic field, the degree of magnetic moment order changes, that is, the magnetic entropy will change, causing the material to absorb or release heat, which is called the magnetocaloric effect. When there is no external magnetic field, the direction of the internal magnetic moment of the material is chaotic, which is manifested by the large magnetic entropy of the material; when there is an external magnetic field, the orientation of the internal magnetic moment of the material tends to be consistent gradually, which is manifested by the small magnetic entropy of the material. A class of materials with magnetocaloric effect is called magnetic refrigeration material, and magnetic re...

Claims

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Application Information

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IPC IPC(8): H01F1/01
CPCH01F1/017
Inventor 沈俊谢慧财莫兆军高新强李振兴李珂王俊峰陈琪孙浩
Owner JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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