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Rare earth RE2MnCuO6 material applied to low-temperature magnetic refrigeration and preparation method thereof

A low-temperature magnetic refrigeration and rare earth technology, which is applied to magnetic materials, inorganic material magnetism, chemical instruments and methods, etc., can solve the problems of complex preparation process, high raw material price, and low entropy, and achieve simple process, simple preparation method, The effect of large and low temperature magnetic entropy change

Pending Publication Date: 2020-04-10
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the magnetic refrigeration materials in the low temperature region are mainly some rare earth intermetallic compound materials, which have the disadvantages of high raw material prices, low entropy, and complicated preparation processes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Step 1: Weigh gadolinium oxide, manganese oxide and copper oxide according to the ion molar ratio of 2:1:1 and mix evenly, add dilute nitric acid with a concentration of 2.5mol / L drop by drop and keep stirring until all oxides are completely dissolved form a homogeneous solution;

[0017] Step 2: Add citric acid dissolved in deionized water, the total mass of gadolinium oxide, manganese oxide, and copper oxide: the mass ratio of citric acid is 1:1.5, heat to 85°C, and form a gel after rapid stirring;

[0018] Step 3: After cooling, anneal the gel at 520°C for 6 hours to form a pre-product;

[0019] Step 4: Grind the pre-product into powder, press it into tablets, put it into a corundum crucible, heat it to 840°C, sinter it in a flowing air atmosphere for 52 hours, and cool it to room temperature with the furnace to get the finished product. It is measured that the isothermal magnetic entropy of the obtained finished product changes to 6.4J / kgK under a magnetic field ch...

Embodiment 2

[0021] Step 1: Weigh the mixture of terbium oxide and dysprosium oxide with manganese oxide and copper oxide according to the ion molar ratio of 2:1:1 and mix evenly, add dilute nitric acid with a concentration of 3mol / L drop by drop and keep stirring until all All oxides dissolve to form a homogeneous solution;

[0022] Step 2: Add the total mass of citric acid, terbium oxide, and dysprosium oxide dissolved in deionized water: the mass ratio of citric acid is 1:3, heat to 100°C, and form a gel after rapid stirring;

[0023] Step 3: After cooling, anneal the gel at 580°C for 6.5 hours to form a pre-product;

[0024] Step 4: Grind the pre-product into powder, press into tablets, put it into a crucible, heat to 900°C, sinter for 70 hours in a flowing air atmosphere, and cool to room temperature with the furnace to get the finished product. It is measured that the isothermal magnetic entropy of the obtained finished product changes to 5.4J / kgK under a magnetic field change of 0-...

Embodiment 3

[0026] Step 1: Weigh the mixture of dysprosium oxide, holmium oxide and erbium oxide with manganese oxide and copper oxide according to the ion molar ratio of 2:1:1, mix them evenly, add dilute nitric acid with a concentration of 3.5mol / L drop by drop Stir continuously until all oxides are completely dissolved to form a homogeneous solution;

[0027] Step 2: Add citric acid dissolved in deionized water, the total mass of dysprosium oxide, holmium oxide, erbium oxide, manganese oxide, and copper oxide: the mass ratio of citric acid is 1:2.5, heat to 105°C, and stir rapidly to form a coagulate glue;

[0028] Step 3: After cooling, anneal the gel at 640°C for 8 hours to form a pre-product;

[0029] Step 4: Grind the pre-product into powder, press it into tablets, put it into a crucible, heat to 1040°C, sinter for 98 hours in a flowing air atmosphere, and cool to room temperature with the furnace to get the finished product. It is measured that the isothermal magnetic entropy of...

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Abstract

The invention relates to a rare earth RE2MnCuO6 material applied to low-temperature magnetic refrigeration and a preparation method thereof, and the rare earth RE2MnCuO6 material has an orthogonal crystal structure and belongs to a Pnma space group; under the magnetic field change of 0-2T, the isothermal magnetic entropy is changed into 4.2-6.4 J / kgK, and under the magnetic field change of 0-5T, the isothermal magnetic entropy is changed into 8.4-13.9 J / kgK; and under the change of a magnetic field of 0-7T, the isothermal magnetic entropy is changed into 11.5-15.8 J / kgK. The preparation methodcomprises the following steps: mixing one or more of gadolinium oxide, terbium oxide, dysprosium oxide, holmium oxide and erbium oxide with manganese oxide and copper oxide, then mixing with dilute nitric acid to form a uniform solution, adding citric acid dissolved by deionized water, and evaporating moisture to dryness to form gel; performing annealing to form a sinter; and tabletting, molding,sintering and cooling the sinter to obtain a finished product. The rare earth RE2MnCuO6 material applied to low-temperature magnetic refrigeration and the preparation method thereof can be applied tothe field of low-temperature zone magnetic refrigeration. The preparation method is simple in process and suitable for industrialization.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to a rare earth RE used in low-temperature magnetic refrigeration 2 MnCuO 6 (RE is rare earth Gd, Tb, Dy, Ho, Er, or a mixture of two or more) materials and preparation methods thereof. Background technique [0002] The magnetic refrigeration material is a non-polluting refrigerant material that realizes refrigeration based on the magnetocaloric effect (magnetocaloric effect, also known as the magnetic card effect or magnetic entropy effect) of the material. Magnetic refrigeration is considered a "green" refrigeration method. Because magnetic refrigeration uses solid materials as the refrigerant, it does not use any harmful gases that will destroy the ozone layer and produce greenhouse effects, and its refrigeration efficiency can be 20-30% higher than the current best refrigeration system. It is a new type of high-efficiency and environmentally friendly Refrigeratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/01H01F41/02C01G45/00
CPCC01G45/006H01F1/017H01F41/02
Inventor 李领伟贾佑顺李勇赵晓宇
Owner HANGZHOU DIANZI UNIV
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