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Magnetocaloric material and preparation method and application thereof

A technology of magnetocaloric materials and magnetic refrigerators, which is applied in the fields of magnetic materials, inorganic materials, inductors/transformers/magnets, etc., and can solve the problems of complex preparation process, high cost, and hindering the development of magnetic refrigeration technology

Active Publication Date: 2021-07-13
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the magnetic entropy change of the existing magnetocaloric materials is small in the low temperature region, especially the value of the magnetic entropy change per volume unit is low, the magnetic refrigeration effect is poor, and the preparation process is complicated and the cost is high, which hinders the development of magnetic refrigeration technology.

Method used

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  • Magnetocaloric material and preparation method and application thereof
  • Magnetocaloric material and preparation method and application thereof
  • Magnetocaloric material and preparation method and application thereof

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preparation example Construction

[0052] The present application also provides a method for preparing the above magnetocaloric material, comprising:

[0053] Mix gadolinium source, titanium source and metal M source, heat treatment at 950°C-1500°C for 4-30h to obtain magnetocaloric material, the molecular formula of magnetocaloric material is Gd 2 MTiO 6 , M includes one or more of Mg, Mn, Fe, Co, Ni, Cu and Zn.

[0054] In the embodiment of the present application, the source of gadolinium includes gadolinium oxide, gadolinium fluoride, gadolinium chloride, gadolinium bromide, gadolinium nitrate, gadolinium sulfate, gadolinium oxalate, gadolinium carbonate, gadolinium boride, gadolinium perchlorate, trifluoromethanesulfonic acid One or more of gadolinium, gadolinium hydroxide, gadolinium acetylacetonate, and gadolinium isopropoxide. In the embodiment of the present application, the titanium source includes titanium oxide, titanium chloride, titanium bromide, titanium oxide sulfate, titanocene dichloride, te...

Embodiment 1

[0064] A method for preparing a magnetocaloric material, comprising the steps of:

[0065] Will Gd 2 o 3 、TiO 2 and ZnO are placed in a ball mill at a molar ratio of 1:1:1, and a small amount of ethanol is added. After ball milling for 3 hours, the mixture is placed in a muffle furnace and annealed at 1300°C for 24 hours to obtain Gd 2 ZnTiO 6 Magnetic caloric material.

Embodiment 2

[0067] A method for preparing a magnetocaloric material, comprising the steps of:

[0068] Will Gd 2 o 3 、TiO 2 and MgO are placed in a ball mill at a molar ratio of 1:1:1, and a small amount of ethanol is added. After ball milling for 3 hours, the mixture is placed in a muffle furnace and annealed at 1400°C for 6 hours to obtain Gd 2 MgTiO 6 Magnetic caloric material.

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Abstract

The invention provides a magnetocaloric material, the molecular formula of the magnetocaloric material is Gd2MTiO6, and M comprises one or more of Mg, Mn, Fe, Co, Ni, Cu and Zn. The magnetocaloric material has large magnetic entropy change and high adiabatic temperature change in a low-temperature area, and a good refrigeration effect can be achieved in the low-temperature area. The invention further provides a preparation method and application of the magnetocaloric material.

Description

technical field [0001] The present application relates to the technical field of magnetic refrigeration, in particular to a magnetic-caloric material and its preparation method and application. Background technique [0002] Refrigeration in the low temperature region (<120K) plays a very important role in the fields of gas liquefaction, high energy physics, superconducting technology and aerospace. Magnetic refrigeration is a pollution-free refrigeration technology that uses the magnetic card effect of magnetocaloric materials to achieve refrigeration. Magnetic refrigeration technology has the advantages of small device size, low noise, no pollution, and high refrigeration efficiency. It is a refrigeration technology with great development potential. [0003] The key to magnetic refrigeration technology lies in the selection of magnetocaloric materials. An ideal magnetocaloric material should have a large magnetic entropy change and adiabatic temperature change. A large ...

Claims

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Application Information

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IPC IPC(8): H01F1/01H01F41/02
CPCH01F1/017H01F41/02
Inventor 杨子煜曾昱嘉崔宏志梁华伟
Owner SHENZHEN UNIV
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