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Preparation method for europium-based low-temperature magnetic refrigeration material of ThCr2Si2 structure

A low-temperature magnetic refrigeration, europium-based technology, applied in the field of materials science, can solve the problems of commercial application limitations, small magnetic entropy, etc., and achieve the effect of significant magnetic entropy change, high magnetic refrigeration capacity, and overcoming volatilization.

Active Publication Date: 2012-11-28
SERVICE CENT OF COMMLIZATION OF RES FINDINGS HAIAN COUNTY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the current magnetic refrigeration materials in the low temperature region mainly include Gd 3 Ga 5 o 12 , GdLiF 4 Isoparamagnetic metal salts and some rare earth intermetallic compounds, but their commercial application is limited due to their relatively small magnetic entropy change

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Step (1). 15.19g (0.1 mole) of rare earth metal europium, 12.71g (0.2 mole) of metal copper, and 6.489g (0.21 mole) of non-metallic phosphorus were uniformly mixed into raw materials in an Ar gas glove box;

[0017] Step (2). The raw material is placed in the quartz container, the quartz container is evacuated, and the pressure in the quartz container reaches 1.6×10 -2 Close the quartz container after Pa;

[0018] Step (3). Put the quartz container into a vertical sintering furnace, heat up to 430°C at a rate of 4°C / min and keep it warm for 7 hours, then continue to heat up to 860°C at a speed of 9°C / min and keep it warm for 7 hours;

[0019] Step (4). The quartz container is naturally cooled to normal temperature, and the product in the quartz container is taken out, and pressed into tablets at normal temperature and 13Mpa pressure;

[0020] Step (5). High temperature annealing at 880°C for 12 hours, then naturally cooling to room temperature to obtain EuCu 2 P 2 fi...

Embodiment 2

[0023] Step (1). 15.19g (0.1 mole) of rare earth metal europium, 11.16g (0.2 mole) of metallic iron, and 15.58g (0.207 mole) of non-metallic arsenic were uniformly mixed into raw materials in an Ar gas glove box;

[0024] Step (2). Put the raw material in the quartz container, vacuumize the quartz container, and the pressure in the quartz container reaches 1.8×10 -2 Close the quartz container after Pa;

[0025] Step (3). Put the quartz container into a vertical sintering furnace, heat up to 450°C at a rate of 5°C / min and keep it warm for 5 hours, then continue to heat up to 900°C at a speed of 10°C / min and keep it warm for 5 hours;

[0026] Step (4). The quartz container is naturally cooled to normal temperature, and the product in the quartz container is taken out, and pressed into tablets at normal temperature and under a pressure of 15Mpa;

[0027] Step (5). High temperature annealing at 900°C for 10 hours, then naturally cooling to room temperature to obtain EuFe 2 As 2...

Embodiment 3

[0030] Step (1). 15.19g (0.1 mole) of rare earth metal europium, 11.16g (0.2 mole) of metallic iron, and 6.365g (0.206 mole) of non-metallic phosphorus were uniformly mixed into raw materials in an Ar gas glove box;

[0031] Step (2). Put the raw material in the quartz container, vacuumize the quartz container, and the pressure in the quartz container reaches 2×10 -2 Close the quartz container after Pa;

[0032] Step (3). Put the quartz container into a vertical sintering furnace, heat it up to 400°C at a rate of 3°C / min and keep it warm for 10 hours, then continue to heat it up to 800°C at a speed of 8°C / min and keep it warm for 10 hours;

[0033] Step (4). The quartz container is naturally cooled to normal temperature, and the product in the quartz container is taken out, and pressed into tablets at normal temperature and a pressure of 12Mpa;

[0034] Step (5). High temperature annealing at 800°C for 24 hours, then naturally cooling to room temperature to obtain EuFe 2 P ...

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Abstract

The invention relates to a europium-based low-temperature magnetic refrigeration material of a ThCr2Si2 structure and a preparation method for the europium-based low-temperature magnetic refrigeration material. The chemical general formula of the magnetic material is Eu-T-X, wherein T is Fe or Cu, and X is P or As; and the magnetic material has body-centered ThCr2Si2 tetragonal crystal structure.The method comprises the following steps of: mixing rare-earth metallic europium, transition metal and nonmetal in a ratio to form a raw material, wherein the transition metal is Fe or Cu, and the nonmetal is P or As; putting the raw material into a quartz container, vacuumizing, closing, heating the quartz container to the temperature of between 400 and 450 DEG C, preserving heat, continuously heating the quartz container to the temperature of between 800 and 900 DEG C, and preserving heat; and performing pressure molding on the product after cooling, performing high-temperature annealing and cooling, and thus obtaining a finished product. By adopting the method of slow heating and step-by-step reaction, volatilization of P or As is effectively overcome. The method is simple in process and is easily implemented, and the prepared magnetic refrigeration material has good magnetic and thermal reversible properties.

Description

technical field [0001] The invention belongs to the technical field of materials science, and relates to a magnetic functional material, in particular to a europium-based ThCr 2 Si 2 The preparation method of low-temperature magnetic refrigeration material with structure. Background technique [0002] Magnetic refrigeration material is a new type of magnetic functional material. It is a non-polluting refrigerant material that uses the magnetic entropy effect (magnetocaloric effect, also known as the magnetic card effect) of magnetic materials to achieve refrigeration. The magnetic entropy effect is one of the intrinsic properties of magnetic materials, and its size depends on the intrinsic physical properties of magnetic materials. Magnetic refrigeration is the use of an external magnetic field to make the magnetic moment of the magnetic working medium change orderly and disorderly (phase transition) to cause the magnet to absorb heat and release heat to perform a refriger...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C28/00C22C1/02C22F1/02C22F1/16C09K5/14
Inventor 李领伟霍德璇苏伟涛吕燕飞钱正洪
Owner SERVICE CENT OF COMMLIZATION OF RES FINDINGS HAIAN COUNTY
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