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Crystal material, preparation method thereof and magnetic refrigerating material applying crystal material

A technology of crystal materials and single crystal materials, applied in the direction of polycrystalline material growth, crystal growth, heat exchange materials, etc., can solve the problem of narrow applicable temperature range, etc., achieve simple preparation method, good refrigeration performance, and broad market foreground effect

Active Publication Date: 2016-06-29
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Because each magnetic refrigeration material has the disadvantage of narrow applicable temperature range

Method used

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  • Crystal material, preparation method thereof and magnetic refrigerating material applying crystal material
  • Crystal material, preparation method thereof and magnetic refrigerating material applying crystal material
  • Crystal material, preparation method thereof and magnetic refrigerating material applying crystal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation of embodiment 1 sample

[0035] Mix copper sulfate, gadolinium oxide, potassium tellurite, boric acid and water according to a certain molar ratio, and place the resulting mixture in a synthesis kettle lined with polytetrafluoroethylene, crystallize at a certain temperature for a period of time, and cool to room temperature , the resulting solid is the crystalline material.

[0036] See Table 1 for the relationship between raw material ratios, sample labels, and crystal conditions.

[0037] Table 1

[0038]

Embodiment 2

[0039] The preparation of embodiment 2 single crystal sample

[0040] Copper sulfate, gadolinium oxide, potassium tellurite, boric acid and water according to Cu:Gd:S:Te:B:H 2 O=3:3:3:1.14:1:1120 molar ratio mixing, the resulting mixture is placed in a polytetrafluoroethylene-lined synthesis kettle, crystallized at 210°C for 4 days, then slowly cooled down to room temperature over 4 days , the obtained solid is a single crystal material, which is recorded as sample 5 # .

Embodiment 3

[0041] The structural characterization of embodiment 3 sample

[0042] Sample 5 # The X-ray single crystal diffraction was carried out on a MercuryCCD type single crystal diffractometer, Mo target, Kα radiation source (λ=0.07107nm), test temperature 293K. And analyze its structure through Shelxtl97. The theoretical XRD diffraction pattern obtained by fitting the single crystal data is compared with the experimentally measured XRD diffraction pattern. figure 2 As shown, it can be seen that the XRD diffraction pattern obtained by fitting single crystal data is highly consistent with the XRD diffraction pattern measured experimentally.

[0043] Sample 5 # The crystallographic data results are shown in Table 2, and the schematic diagram of the crystal structure is shown in figure 1 As shown, the gadolinium-oxygen polyhedron and the copper-oxygen tetrahedron form a two-dimensional layered structure, and the layers are separated by the sulfur-oxygen tetrahedron to form a three-...

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Abstract

The invention discloses a crystal material. The crystal material is characterized in that a molecular formula of the crystal material is fd2Cu(SO4)2(OH)4, the crystal material belongs to a monoclinic system, space group is P21 / c, cell parameters are shown as follows, wherein both alpha and gamma are equal to 90 degrees, beta is equal to 98.3-98.4, and Z is equal to 2. Magnetothermal effect of the crystal material is far greater than DGG, and the crystal material has good refrigerating performance. The invention further discloses a preparation method of the crystal material. The preparation method is simple, suitable for large-scale industrial production and wide in market prospect.

Description

technical field [0001] The application relates to a crystal material and a preparation method thereof, belonging to the field of magnetic refrigeration materials. Background technique [0002] Magnetic refrigeration materials have attracted widespread attention of scientists due to their advantages of high efficiency, energy saving, and no environmental pollution. Magnetic refrigeration materials are divided into three categories according to the temperature range of their application: extremely low temperature range (below 20K), low temperature range (20-77K) and high temperature range (above 77K). The materials in the temperature range below 20K are mainly used for the production of He flow and the pre-refrigeration of helium liquefaction, the temperature range of 20-77K is mainly the temperature range of liquefied hydrogen, and the temperature range above 77K is mainly for room temperature magnetic refrigeration. [0003] In 1933, Giaugue et al. used the paramagnetic sal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B7/10C01G11/00C09K5/14
Inventor 汤莹莹何长振
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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