Gadolinium borate and preparation method and application thereof

A technology of gadolinium borate and boric acid, applied in the field of gadolinium borate, can solve problems such as low efficiency and destroy the ozone layer, and achieve the effects of broad application prospects, high magnetocaloric effect, and simple device

Inactive Publication Date: 2016-08-10
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous improvement of people's living standards, the low efficiency of traditional gas compression refrigerators can no longer meet people's requirements
At the same time, the refrigerant Freon used in traditional refrigerators will seriously damage the ozone layer. People began to explore a new type of refrigeration technology, which has the two advantages of high efficiency, energy saving and no environmental pollution.

Method used

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  • Gadolinium borate and preparation method and application thereof
  • Gadolinium borate and preparation method and application thereof
  • Gadolinium borate and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation process of gadolinium borate magnetic refrigeration material: 0.5mmol gadolinium oxide and 1mmol boric acid were placed in a quartz porcelain boat. The solid was ground into a powder using an agate mortar, mixed well and dried overnight. Transfer the porcelain boat to a 120cm×Φ50 quartz tube furnace, raise the temperature to 400°C at a rate of 300°C / h and keep the temperature constant for 600 minutes, then raise the temperature to 1000°C at a rate of 200°C / h and hold the temperature for 6 hours, and then increase the temperature at 50°C / h The temperature was cooled to room temperature at a rate of h to obtain a white powder solid. The product was washed with absolute ethanol and deionized water, filtered with suction, and dried overnight to obtain white powdery crystals.

Embodiment 2

[0027] Structure Characterization

[0028] The powder sample crystal structure of gadolinium borate magnetic refrigeration material was collected by Rigaku Ultima IV X-ray single crystal diffractometer at 298K. figure 1 It is the XRD pattern of the gadolinium borate magnetic refrigeration material. from figure 1 It can be seen that the experimental diffraction peaks of its XRD are basically consistent with the XRD data (straight line) fitted according to the single crystal structure. The peak shape of each characteristic diffraction peak is good, and the baseline is relatively stable, indicating that the sample has no impurity phase, high purity, and good crystal phase.

[0029] Gadolinium borate magnetic refrigeration material: it belongs to the hexagonal crystal system, the space group is 6mm, and the molecular formula is GdBO 3 , the unit cell parameters are a=3.829, b=3.829, c=8.89, V=112.9.

Embodiment 3

[0031] magnetic test

[0032] A Quantum Design SQUID MPMS magnetometer was used to test the gadolinium borate magnetic refrigeration material under the conditions of a temperature range of 2-300K and an external magnetic field of 1000Oe. figure 2 is the temperature-varying susceptibility diagram of the gadolinium borate magnetic refrigeration material. And the test is carried out in the temperature range of 2-10K and the magnetic field of 0-7T. image 3 is the magnetic entropy change diagram of the gadolinium borate magnetic refrigeration material.

[0033] figure 2 shows that at room temperature, the χ of the gadolinium borate magnetic refrigeration material M T value is 7.62cm 3 mol -1 K, with 1 uncoupled Gd calculated according to Curie's theorem 3+ The χ obtained by the ion M Theoretical value of T is 7.88cm 3 mol -1 K is very close. In the temperature range of 300 ~ 100K, as the temperature drops χ M There is almost no change in the T value, below 100K, χ M ...

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Abstract

The invention relates to gadolinium borate and a preparation method and application thereof. According to preparation of gadolinium borate, Gd<3+> is used as a raw material, and small molecular weight BO3<3-> is used as a ligand. The preparation method comprises the following steps: placing gadolinium oxide and boric acid into a quartz porcelain boat, grinding solids into powders, uniformly mixing, drying, transferring the quartz porcelain boat into a quartz tube furnace, heating to 400 DEG C and keeping the temperature for 10 h, heating to 1000 DEG C and keeping the temperature for 6h, cooling to room temperature to obtain a white powdery solid, washing and carrying out suction filtration, and drying to obtain gadolinium borate. The gadolinium borate which is white powdery crystal can be applied in preparation of magnetic refrigeration materials. Synthetic equipment is simple, and the preparation method is fast and easy to operate. The gadolinium borate is a borate compound and has very strong stability and good heat stability from a strong acid environment to a strong base environment. By raising mass ratio of rare earth to the ligand, magnetic density is raised, and magnetic refrigeration effect of the material is greatly enhanced.

Description

technical field [0001] The invention relates to gadolinium borate, in particular to gadolinium borate and its preparation method and application. Background technique [0002] Traditional gas compression refrigeration technology has been widely used in people's daily life. However, with the continuous improvement of people's living standards, the low efficiency of traditional gas compression refrigerators can no longer meet people's requirements. At the same time, the refrigerant Freon used in traditional refrigerators will seriously damage the ozone layer. People began to explore a new type of refrigeration technology, which has the two advantages of high efficiency, energy saving and no environmental pollution. In 1997, the Ames Laboratory of the US Department of Energy discovered that an alloy composed of Gd, Si, and Ge can exhibit a huge magnetocaloric effect at room temperature. Since then, American Aerospace Corporation has begun to develop a A new type of refrigerat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/12H01F1/01
CPCC01B35/127C01P2002/72H01F1/012
Inventor 龙腊生陈可男
Owner XIAMEN UNIV
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