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A kind of rare earth palladium magnesium low temperature magnetic refrigeration material and its preparation method

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 small magnetic entropy and commercial application limitations, and achieve significant magnetic entropy change, high magnetic refrigeration capacity, and easy implementation Effect

Active Publication Date: 2017-05-31
NORTHEASTERN UNIV LIAONING
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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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  • A kind of rare earth palladium magnesium low temperature magnetic refrigeration material and its preparation method
  • A kind of rare earth palladium magnesium low temperature magnetic refrigeration material and its preparation method
  • A kind of rare earth palladium magnesium low temperature magnetic refrigeration material and its preparation method

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Experimental program
Comparison scheme
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 qua...

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 uniformly 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 qua...

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 composition of rare earth palladium magnesium low temperature magnetic refrigeration material, 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) P...

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Abstract

A rare earth palladium magnesium low-temperature magnetic refrigeration material and its preparation method. The general chemical formula of the material is: RE4-Pd-Mg, RE is one or two of Ho, Er or Tm, according to the atomic ratio RE: Pd: Mg =4:1:1; Preparation method: 1) Mixing; 2) Inert gas closed environment; 3) Sintering: Keep the quartz container at 850-920°C for 10-20 minutes, then lower the temperature to 650-720°C and keep it warm 3 to 5 hours, natural cooling; 4) Tablet molding; 5) Sealed annealing: Place the formed material into a quartz tube and seal, anneal at 660 to 700°C for 36 to 48 hours, and naturally cool to obtain the finished product. The material of the invention has significant magnetic entropy change and high magnetic refrigeration capacity. The magnetic transition temperature and the maximum magnetic entropy change can be continuously adjusted with changes in composition within the temperature range of 5 to 40K; it has good magnetic and thermal reversible properties. The method of the present invention adopts slow heating and step-by-step reaction to overcome Mg volatilization; the process is simple and easy to implement.

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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Patent Type & Authority Patents(China)
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 LIAONING
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