Application of gadolinium hydroxide

A technology of gadolinium hydroxide and magnetic refrigeration material, which is applied in the directions of heat exchange materials, chemical instruments and methods, can solve the problems of destruction of the ozone layer and low efficiency, and achieves the advantages of simple synthesis device, good thermal stability and fast preparation method. Effect

Inactive Publication Date: 2015-04-22
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Traditional gas compression refrigeration technology has been widely used in people's daily life, but 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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  • Application of gadolinium hydroxide
  • Application of gadolinium hydroxide
  • Application of gadolinium hydroxide

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The preparation process of gadolinium hydroxide material: mix 1mmol gadolinium oxide with newly prepared 15mL sodium hydroxide solution (concentration 25mol / L), stir evenly, transfer the solution to a 23mL polytetrafluoroethylene-lined pressure-resistant stainless steel reaction kettle, and The temperature was raised to 250°C at a rate of 45°C / h and kept at a constant temperature for 7000 minutes, then naturally cooled to room temperature, filtered and washed to obtain colorless needle-like crystals.

Embodiment 2

[0027] Sample Characterization:

[0028] 1. Single crystal test:

[0029] The single crystal sample structure of gadolinium hydroxide material was collected by Agilent Super Nova Diffractometer X-ray single crystal diffractometer at 100K.

[0030] 2. Gadolinium hydroxide material: belongs to the hexagonal crystal system, space group P6 3 / m, the molecular formula is Gd(OH) 3 , the unit cell parameters are a=6.2993, b=6.2993, c=3.6057, V=123.91. Its structural coordination mode is as figure 1 and 2 As shown, each asymmetric unit contains 1 / 6 Gd 3+ ions and 1 / 2 OH - ion. per Gd 3+ The ions are nine-coordinated with nine μ 3 -OH - Coordinated to form a tetradecahedral configuration. per OH - ion with three Gd 3+ Bridges form a three-dimensional frame structure. The Gd-O bond grows in Within the range, the Gd-O-Gd bond angle is 95.4°~112.3°, and the distances between Gd···Gd are and

[0031] Structure Characterization:

[0032] The powder samples were chara...

Embodiment 3

[0034] magnetic test

[0035] A Quantum Design SQUID MPMS magnetometer was used to test the gadolinium hydroxide material under the conditions of a temperature range of 2-300K and an external magnetic field of 1000Oe. Figure 4 is the temperature-varying magnetic susceptibility diagram of gadolinium hydroxide material. And the test is carried out in the temperature range of 2-10K and the magnetic field of 0-7T. Figure 5 is the magnetization diagram of the gadolinium hydroxide material with varying temperature and field. Figure 6 is the magnetic entropy change diagram of gadolinium hydroxide material.

[0036] Figure 4 show that, at room temperature, the gadolinium hydroxide material's M T value is 8.00cm 3 mol-1 K, with 1 uncoupled Gd calculated according to Curie's theorem 3+ ions obtained by 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 M There is almost no change in T value, below ...

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Abstract

Provided is an application of gadolinium hydroxide. The invention relates to the gadolinium hydroxide. The gadolinium hydroxide belongs to the hexagonal crystal system. The space group of the gadolinium hydroxide is P63 / m, the molecular formula is Gd(OH)3, the cell parameters are a=6.2993, b=6.2993, c=3.6057, V=123.91. The gadolinium hydroxide has the magnetothermal effect of heat absorbing and heat releasing in accordance with the changes of a magnetic field, and applicable to the preparation of magnetic refrigeration materials. The high magnetothermal effect of the gadolinium hydroxide is created under a super low temperature and a weak magnetic field. The gadolinium hydroxide has a promising application prospect in fields of replacing expensive inert gases to conduct low temperature magnetic refrigeration and the like.

Description

technical field [0001] The present invention relates to gadolinium hydroxide, in particular to gadolinium hydroxide (Gd(OH) 3 )Applications. Background technique [0002] Traditional gas compression refrigeration technology has been widely used in people's daily life, but 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 refrigerator based o...

Claims

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Application Information

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IPC IPC(8): C09K5/14
CPCC09K5/14
Inventor 龙腊生杨雁潘吟银
Owner XIAMEN UNIV
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