Gadolinium-based high-entropy perovskite oxide magnetic refrigeration material and preparation method thereof

A technology of perovskite oxides and magnetic refrigeration materials, which is applied in the fields of magnetic materials, inorganic material magnetism, inductance/transformer/magnet manufacturing, etc. It is difficult to popularize and popularize, and achieve the effect of large magnetic entropy change, stable preparation process and low cost of raw materials

Pending Publication Date: 2022-01-21
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the types of high-entropy ceramics that have achieved great research results are mostly concentrated in carbides, nitrides and borides, and the perovskite-structured high-entropy oxide ceramics are still in the initial stage of research.
In addition, there are sintering methods for preparing high-entropy ceramics, such as flash firing, discharge plasma sintering, and hot-pressing sintering, but these technologies are relatively complicated, require high experimental equipment, and are difficult to popularize, which limits the use of oxide magnetic refrigeration materials. Applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A gadolinium-based high-entropy perovskite oxide magnetic refrigeration material whose general chemical formula is Gd(Mn 0.3 Fe 0.2 co 0.2 Ni 0.1 Al 0.2 )O 3 .

[0029] The preparation method of the gadolinium-based high-entropy perovskite oxide magnetic refrigeration material in this embodiment, the specific steps are:

[0030] Step 1: Add 0.01 mol of gadolinium nitrate and metal salt into 100 ml of deionized water and stir until fully dissolved to obtain a mixed solution; the metal salt includes 0.003 mol of manganese chloride, 0.002 mol of iron nitrate, 0.002 mol of cobalt nitrate, and 0.001 mol of nickel nitrate and aluminum nitrate 0.002mol;

[0031] Step 2: Add 0.03 mol of citric acid to the mixed solution obtained in Step 1, heat to 85°C and keep it warm, and keep stirring until the solution evaporates to 40ml to obtain a sol;

[0032] Step 3: Put the sol obtained by stirring in step 2 into a drying oven, keep the temperature of 100°C and dry for 2 hours t...

Embodiment 2

[0039] This embodiment is basically the same as Embodiment 1, and the special features are:

[0040] A gadolinium-based high-entropy perovskite oxide magnetic refrigeration material whose general chemical formula is Gd(Cr 0.25 Fe 0.2 co 0.3 Ni 0.1 Al 0.15 )O 3 .

[0041] The preparation method of the gadolinium-based high-entropy perovskite oxide magnetic refrigeration material in this embodiment, the specific steps are:

[0042] Step 1: Add 0.01 mol of gadolinium nitrate and metal salt to 100 ml of deionized water and stir until fully dissolved to obtain a mixed solution; the metal salt includes 0.0025 mol of chromium nitrate, 0.002 mol of iron nitrate, 0.003 mol of cobalt nitrate, 0.001 mol of nickel nitrate and Aluminum nitrate 0.0015mol;

[0043]Step 2: Add 0.03 mol of citric acid to the mixed solution obtained in Step 1, heat to 85°C and keep it warm, and keep stirring until the solution evaporates to 40ml to obtain a sol;

[0044] Step 3: Put the sol obtained by ...

Embodiment 3

[0050] This embodiment is basically the same as the above-mentioned embodiment, and the special features are:

[0051] A gadolinium-based high-entropy perovskite oxide magnetic refrigeration material whose general chemical formula is Gd(Cr 0.2 mn 0.1 Fe 0.1 co 0.15 Ni 0.15 Al 0.3 )O 3 .

[0052] The preparation method of the gadolinium-based high-entropy perovskite oxide magnetic refrigeration material in this embodiment, the specific steps are:

[0053] Step 1: Add 0.01 mol of gadolinium nitrate and metal salt to 100 ml of deionized water and stir until fully dissolved to obtain a mixed solution; the metal salt includes 0.002 mol of chromium nitrate, 0.001 mol of manganese chloride, 0.001 mol of ferric chloride, and 0.0015 mol of cobalt nitrate mol, nickel nitrate 0.0015mol and aluminum nitrate 0.003mol;

[0054] Step 2: Add 0.03 mol of citric acid to the mixed solution obtained in Step 1, heat to 85°C and keep it warm, and keep stirring until the solution evaporates ...

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Abstract

The invention relates to a gadolinium-based high-entropy perovskite oxide magnetic refrigeration material and a preparation method thereof, the chemical general formula of the magnetic refrigeration material is GdXO3, X is at least four elements of transition metals Cr, Mn, Fe, Co, Ni or Al, the molar content range of each component element is 10-30%, and the total content is 100%. The material has a perovskite structure, the space group is Pbnm, and the disordered arrangement of transition metal ions has typical high-entropy characteristics. The preparation method mainly comprises the following steps: dissolving rare earth salt and metal salt which are mixed according to an equal ratio in water, the molar mass ratio of ions being 1: 1; adding citric acid into the obtained salt solution, heating, preserving heat, and fully stirring the mixture to form sol; drying the sol by distillation to obtain gel; calcining the gel to obtain a sinter; and tabletting and molding the sinter, performing sintering at high temperature, and performing cooling to obtain a finished product. The gadolinium-based high-entropy perovskite oxide material prepared by the method can be applied to the field of low-temperature region magnetic refrigeration, and is low in raw material price, simple in equipment, simple and reliable in process and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of rare earth magnetic functional materials, in particular to a gadolinium-based high-entropy oxide magnetic refrigeration material GdXO 3 and the preparation method thereof, wherein, X is a mixture of four or more transition metals Cr, Mn, Fe, Co, Ni or Al. Background technique [0002] Magnetic refrigeration materials are a new type of magnetic functional material that mainly uses the magnetocaloric effect or magnetic card effect of magnetic materials to achieve refrigeration. The biggest difference between magnetic refrigeration and traditional refrigeration is that it does not depend on various refrigerants that will cause environmental pollution. It is a kind of "Green" cooling method. During the isothermal magnetization and adiabatic demagnetization process when the magnetic refrigeration material enters and exits the high magnetic field area from the zero magnetic or low magnetic area, the material h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/01H01F41/02
CPCH01F1/017H01F41/02
Inventor 张义坤田耘王江任忠鸣
Owner SHANGHAI UNIV
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