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R2Cu2O5 oxide material used for low-temperature magnetic refrigeration and preparation method thereof

A low-temperature magnetic refrigeration, r2cu2o5 technology, applied in the field of functional materials, can solve the problems of complex preparation process and high raw material price, and achieve the effects of simple process, simple preparation method and low cost of raw materials

Active Publication Date: 2016-02-24
NORTHEASTERN 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 and complicated preparation processes.

Method used

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  • R2Cu2O5 oxide material used for low-temperature magnetic refrigeration and preparation method thereof
  • R2Cu2O5 oxide material used for low-temperature magnetic refrigeration and preparation method thereof
  • R2Cu2O5 oxide material used for low-temperature magnetic refrigeration and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] A Dy used in low temperature magnetic refrigeration 2 Cu 2 o 5 oxide material, the Dy 2 Cu 2 o 5 The oxide material has an orthorhombic crystal structure and belongs to the Pnma space group.

[0025] Dy used in low temperature magnetic refrigeration 2 Cu 2 o 5 The preparation method of oxide material, concrete steps are:

[0026] Step 1: Add 0.02mol of dysprosium oxide and 0.04mol of copper nitrate into dilute nitric acid with a concentration of 3mol / L and keep stirring until the holmium oxide is completely dissolved to form a sol;

[0027] Step 2: Add citric acid dissolved in ethanol, mass of dysprosium oxide: mass of citric acid = 1:2, stir quickly and fully, heat to 90°C and evaporate the water to form a gel;

[0028] Step 3: After cooling, anneal the gel at 520°C for 8 hours to form a sintered product;

[0029] Step 4: Grind the sintered product into powder, press it into a tablet with a tablet press, put it into a corundum crucible, sinter at 880°C for 80...

Embodiment 2

[0035] A kind of Ho used in low temperature magnetic refrigeration 2 Cu 2 o 5 oxide material, the Ho 2 Cu 2 o 5 The oxide material has an orthorhombic crystal structure and belongs to the Pnma space group.

[0036] Ho used in low temperature magnetic refrigeration 2 Cu 2 o 5 The preparation method of oxide material, concrete steps are:

[0037] Step 1: Add 0.02mol of holmium oxide and 0.04mol of copper nitrate into dilute nitric acid with a concentration of 4mol / L and keep stirring until the holmium oxide is completely dissolved to form a sol;

[0038] Step 2: Add citric acid dissolved in ethanol, mass of holmium oxide: mass of citric acid = 1:3, stir quickly and fully, heat to 120°C, evaporate water to dryness, and form a gel;

[0039] Step 3: After cooling, anneal the gel at 480°C for 10 hours to form a sintered product;

[0040] Step 4: Grind the sintered product into powder, press it into a tablet with a tablet machine, put it into a corundum crucible, sinter it ...

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Abstract

The invention provides an R2Cu2O5 oxide material used for low-temperature magnetic refrigeration and a preparation method thereof. R in the R2Cu2O5 oxide material is Ho or Dy. The R2Cu2O5 oxide material has an orthogonal crystal structure, belonging to a Pnma space group. The Ho2Cu2O5 oxide material has an isothermal magnetic entropy change range of 8.5 J / kgK to 10 J / kgK under the condition that a magnetic field changes in a range of 0 to 5 T and an isothermal magnetic entropy change range of 11.5 J / kgK to 13.5 J / kgK under the condition that the magnetic field changes in a range of 0 to 7 T; and the Dy2Cu2O5 oxide material has an isothermal magnetic entropy change range of 7 J / kgK to 8 J / kgK under the condition that the magnetic field changes in a range of 0 to 5 T and an isothermal magnetic entropy change range of 10.5 J / kgK to 12.5 J / kgK under the condition that the magnetic field changes in a range of 0 to 7 T. The preparation method comprises the following steps: (1) mixing holmium oxide or dysprosium oxide with cupric nitrate and then allowing the obtained mixture and dilute nitric acid to form a sol; (2) adding citric acid dissolved in ethanol or deionized water and drying moisture by distillation so as to form a gel; (3) carrying out annealing so as to obtain a sinter; and (4) subjecting the sinter to tabletting and shaping and then carrying out sintering in a muffle furnace and cooling so as to obtain the finished R2Cu2O5 oxide material. The R2Cu2O5 oxide material prepared in the invention is applied to the field of low-temperature magnetic refrigeration. The preparation method is simple and suitable for industrialization.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to a R material used in low-temperature magnetic refrigeration. 2 Cu 2 o 5 (R is Ho or Dy) oxide material and preparation method thereof. Background technique [0002] Magnetic refrigeration material is a new type of magnetic functional material. It is a non-polluting refrigerant material that uses the magnetocaloric effect (magnetocaloric effect, also known as magnetic card effect or magnetic entropy effect) of magnetic materials to achieve refrigeration. Magnetic refrigeration is considered as a "green" refrigeration method. It not only does not emit any harmful gases such as Freon, but also consumes 20-30% less energy than the best existing refrigeration systems, and does not destroy The ozone layer does not emit greenhouse gases, and the refrigerators and air-conditioning systems currently in use are becoming the mainstay of energy consumption around the world. ...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/624
CPCC04B35/50C04B35/624C04B2235/3281C04B2235/76C04B2235/96
Inventor 李领伟
Owner NORTHEASTERN UNIV
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