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Rare-earth palladium-magnesium low-temperature magnetic refrigeration material and preparation method thereof

A low-temperature magnetic refrigeration and rare earth technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of commercial application limitations, low magnetic entropy, etc., and achieve significant magnetic entropy change, high magnetic refrigeration capacity, and simple process Effect

Active Publication Date: 2016-06-15
NORTHEASTERN UNIV
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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 some paramagnetic metal salts and rare earth intermetallic compounds, but their commercial application is limited due to their relatively small magnetic entropy change

Method used

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  • Rare-earth palladium-magnesium low-temperature magnetic refrigeration material and preparation method thereof
  • Rare-earth palladium-magnesium low-temperature magnetic refrigeration material and preparation method thereof
  • Rare-earth palladium-magnesium low-temperature magnetic refrigeration material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Rare earth palladium magnesium low temperature magnetic refrigeration material, its chemical formula is: RE 4 -Pd-Mg, RE is Ho, and the atomic ratio Ho:Pd:Mg=4:1:1.

[0031] The preparation method of rare earth palladium magnesium low-temperature magnetic refrigeration material comprises the following steps:

[0032] Step 1, mixing ingredients:

[0033] According to the rare earth palladium magnesium low-temperature magnetic refrigeration material composition, 16.49g (0.1 mole) rare earth metal holmium, 2.66g (0.025 mole) metal palladium, 6.489g (0.025 mole) metal magnesium are evenly mixed into raw materials in an Ar gas glove box;

[0034] Step 2, inert gas closed environment:

[0035] Put the raw material in the quartz container, vacuumize the quartz container, the pressure in the quartz container is less than or equal to 1×10 -2 Pa, filled with 0.76 atmospheres of argon, then the quartz container is closed;

[0036] Step 3, sintering:

[0037] (1) Put the quart...

Embodiment 2

[0048] Rare earth palladium magnesium low temperature magnetic refrigeration material, its chemical formula is: RE 4 -Pd-Mg, RE is Er, and the atomic ratio Er:Pd:Mg=4:1:1.

[0049] The preparation method of rare earth palladium magnesium low-temperature magnetic refrigeration material comprises the following steps:

[0050] Step 1, mixing ingredients:

[0051] According to the rare earth palladium magnesium low temperature magnetic refrigeration material composition, 16.73g (0.1 mole) rare earth metal erbium, 2.66g (0.025 mole) metal palladium, 6.489g (0.025 mole) metal magnesium are evenly mixed into raw materials in an Ar gas glove box;

[0052] Step 2, inert gas closed environment:

[0053] Put the raw material in the quartz container, vacuumize the quartz container, the pressure in the quartz container is less than or equal to 1×10 -2 Pa, filled with 0.8 atmospheres of argon, then the quartz container is closed;

[0054] Step 3, sintering:

[0055] (1) Put the quartz ...

Embodiment 3

[0066] Rare earth palladium magnesium low temperature magnetic refrigeration material, its chemical formula is: RE 4 -Pd-Mg, RE is Tm, in atomic ratio Tm:Pd:Mg=4:1:1.

[0067] The preparation method of rare earth palladium magnesium low-temperature magnetic refrigeration material comprises the following steps:

[0068] Step 1, mixing ingredients:

[0069] According to the rare earth palladium magnesium low-temperature magnetic refrigeration material composition, 16.89g (0.1 mole) rare earth metal thulium, 2.66g (0.025 mole) metal palladium, 6.489g (0.025 mole) metal magnesium are uniformly mixed into raw materials in an Ar gas glove box;

[0070] Step 2, inert gas closed environment:

[0071] Put the raw material in the quartz container, vacuumize the quartz container, the pressure in the quartz container is less than or equal to 1×10 -2 Pa, filled with argon of 0.84 atmospheric pressure, then the quartz container is closed;

[0072] Step 3, sintering:

[0073] (1) Put th...

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Abstract

The invention discloses a rare-earth palladium-magnesium low-temperature magnetic refrigeration material and a preparation method thereof. The material has the chemical general formula as follows: RE4-Pd-Mg, wherein RE is one or two selected from Ho, Er and Tm, and the atomic ratio of RE to Pd to Mg is equal to 4:1:1; and the preparation method comprises the steps of (1) mixing; (2) sealing an environment by using inert gases; (3) sintering, namely keeping a quartz vessel at the temperature of 850-920 DEG C for 10-20min, then, cooling to 650-720 DEG C, keeping the temperature for 3-5h, and naturally cooling; (4) tabletting and molding; and (5) sealing and annealing, namely sealing the molded material into a quartz tube, annealing at the temperature of 660-700 DEG C for 36-48h, and naturally cooling to obtain a finished product. The material disclosed by the invention is obvious in magnetic entropy change, high in magnetic refrigeration capacity and favorable in magnetic and thermal reversibility; and the change of magnetic transition temperature and the maximum magnetic entropy change value along with components within the temperature range of 5-40K is continuously adjustable. Slow temperature rise and step-by-step reaction are adopted in the method disclosed by the invention, so that Mg volatilization is overcome; and the method is simple in process and easy to realize.

Description

technical field [0001] The invention belongs to the technical field of magnetic functional materials, in particular to a rare earth palladium magnesium RE 4 PdMg low temperature magnetic refrigeration material and preparation method. 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 in an orderly and disorderly manner (phase transition), causing the magnet to absorb heat and release heat to perform a refrigeration cycle. The refrigera...

Claims

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Application Information

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IPC IPC(8): C22C28/00C22C1/04B22F3/10C22F1/16C22F1/02C09K5/14
CPCB22F3/10B22F2998/10C09K5/14C22C1/04C22C28/00C22F1/02C22F1/16B22F1/0003B22F3/02B22F2003/248
Inventor 李领伟霍德璇祁阳
Owner NORTHEASTERN UNIV
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