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Crystalline gadolinium-based magnetic refrigeration material and preparation method thereof

A magnetic refrigeration material, gadolinium-based technology, applied in magnetic materials, heat exchange materials, inorganic material magnetism, etc., can solve the problem of limited rare-earth gadolinium-based magnetic refrigeration materials, and achieve good magnetic refrigeration performance, low cost, and good stability. sexual effect

Active Publication Date: 2016-12-07
SHANGQIU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, reports on rare earth gadolinium-base

Method used

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  • Crystalline gadolinium-based magnetic refrigeration material and preparation method thereof
  • Crystalline gadolinium-based magnetic refrigeration material and preparation method thereof
  • Crystalline gadolinium-based magnetic refrigeration material and preparation method thereof

Examples

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Example Embodiment

[0021] Example 1

[0022] The preparation method of the crystalline gadolinium-based magnetic refrigeration material of this embodiment is as follows:

[0023] Add 600 microliters of 1mol / L Gd(NO 3 ) 3 The aqueous solution and 100 microliters of 1mol / L amino trimethylene phosphonic acid aqueous solution were placed in a 15 mL vial, and then 2 mL of deionized water was added, while stirring, 1 mol / L sulfuric acid was added dropwise to adjust the pH When it reaches 1.5, stir for 10 minutes and seal it, then place it in a constant temperature drying oven at 90°C and heat it for 24 hours, and cool to room temperature to obtain a large amount of colorless crystals. Filter, wash three times with water, and dry at room temperature to obtain crystalline gadolinium-based magnetic refrigeration material It was 0.115g, and the yield was 51.3%.

[0024] (1) The obtained crystal samples were characterized by Bruker D8 ADVANCE powder X-ray diffractometer, and the peak positions of the measured an...

Example Embodiment

[0031] Example 2

[0032] The preparation method of the crystalline gadolinium-based magnetic refrigeration material of this embodiment includes the following steps:

[0033] Add 500 microliters of 1mol / L gadolinium nitrate aqueous solution and 100 microliters of 1mol / L aminotrimethylene phosphonic acid aqueous solution into a 15mL reaction flask, then add 6mL deionized water, add 1mol / L dropwise under stirring Sulfuric acid (Sulfuric acid is the construction ligand of the material and is also used to adjust the pH value of the reaction mixture). Adjust the pH of the system to 2, stir for 8 minutes and then seal, heat at a constant temperature of 85°C for 30 hours, cool to room temperature, and filter And drying at room temperature to obtain the gadolinium-based magnetic refrigeration material.

Example Embodiment

[0034] Example 3

[0035] The preparation method of the crystalline gadolinium-based magnetic refrigeration material of this embodiment includes the following steps:

[0036] Add 700 microliters of 1mol / L gadolinium nitrate aqueous solution and 100 microliters of 1mol / L aminotrimethylene phosphonic acid aqueous solution into a 15mL reaction flask, then add 5mL deionized water, and add 1mol / L dropwise under stirring Sulfuric acid (Sulfuric acid is the construction ligand of the material and is also used to adjust the pH value of the reaction mixture). Adjust the pH of the system to 1.5, stir for 10 minutes and then seal, heat at 95°C for 20 hours, cool to room temperature, and filter And drying at room temperature to obtain the gadolinium-based magnetic refrigeration material.

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PUM

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Abstract

The invention discloses a crystalline gadolinium-based magnetic refrigeration material and a preparation method thereof. The crystalline gadolinium-based magnetic refrigeration material has a molecular formula of [Gd2(SO4)3(H2O)8]n. The monocrystalline structure has a 2D layered structure. The asymmetric construction unit comprises one trivalent gadolinium ion, 1.5 sulfate radicals and four tail end coordinated water molecules. The preparation method comprises adding an aqueous solution of gadolinium nitrate and amino trimethylene phosphonic acid into a reaction bottle, adding deionized water into the reaction bottle, dropwisely adding sulfuric acid into the solution along with stirring to adjust pH to 1.5-2, carrying out stirring for 5-10min, then carrying out sealing, carrying out heating at a constant temperature of 85-95 DEG C for 20-30h, carrying out cooling to the room temperature, carrying out filtration and carrying out drying to obtain the crystalline gadolinium-based magnetic refrigeration material. The synthesis and purification processes are simple. The synthesis process is carried out under acidic conditions so that the crystalline gadolinium-based magnetic refrigeration material has good acid stability. The crystalline gadolinium-based magnetic refrigeration material has a low cost and good magnetic refrigeration performances, can be used as a magnetic refrigerant and has a good application prospect in the field of low temperature refrigeration.

Description

technical field [0001] The invention belongs to the technical field of low-temperature refrigeration, and in particular relates to a low-temperature magnetic refrigeration material, a preparation method thereof and its application as a magnetic refrigerant in the field of low-temperature magnetic refrigeration, and belongs to the technical field of low-temperature refrigeration. Background technique [0002] In the 21st century, countries all over the world attach great importance to energy saving and green environmental protection, and magnetic refrigeration technology has the advantages of green environmental protection, high efficiency and energy saving, low noise, reliable and stable equipment, etc., which just meets the requirements of resources, energy and environmental costs. The non-polluting green environmental protection refrigeration technology with broad development prospects has received great attention and extensive research from all over the world in recent yea...

Claims

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Application Information

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IPC IPC(8): C09K5/14C01F17/00H01F1/01
CPCC01F17/282C09K5/14H01F1/017
Inventor 李忠义翟滨张向飞张弛刘起峰曹广秀
Owner SHANGQIU NORMAL UNIVERSITY
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