Tetrahydroxy gadolinium oxide dihydrate and preparation and applications thereof

The technology of dihydrated gadolinium tetrahydroxide and hydrated digadolinium tetrahydroxide is applied in the field of preparation and application of dihydrated gadolinium tetrahydroxide, which can solve the problems of low efficiency, destroying the ozone layer and the like, and achieves simple synthesis device, The effect of good thermal stability and strong stability

Active Publication Date: 2015-04-08
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 requiremen

Method used

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  • Tetrahydroxy gadolinium oxide dihydrate and preparation and applications thereof
  • Tetrahydroxy gadolinium oxide dihydrate and preparation and applications thereof
  • Tetrahydroxy gadolinium oxide dihydrate and preparation and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation process of the rare earth gadolinium magnetic refrigeration material containing hydroxyl complexes: 0.25 mmol of gadolinium nitrate hexahydrate, 0.33 mmol of sodium formate dihydrate and 0.08 mmol of glycine were dissolved in 15 mL of deionized water. Stir the solution constantly, and adjust the pH to about 6.7 with fresh ammonia water (concentration 1mol / L). Transfer the solution to a 23mL polytetrafluoroethylene-lined pressure-resistant stainless steel reactor, raise the temperature to 160°C at a rate of 35°C / h and keep the temperature constant for 4000min, then slowly cool down to room temperature at a rate of 2°C / h, filter and wash to obtain Colorless needle-like crystals.

Embodiment 2

[0028] Sample Characterization:

[0029] 1. Single crystal test:

[0030] The single crystal sample structure of rare earth gadolinium magnetic refrigeration materials containing hydroxyl complexes was collected by Agilent Super Nova Diffractometer X-ray single crystal diffractometer at 100K. figure 1 and 2 is the crystal structure diagram of digadolinium tetrahydroxide dihydrate.

[0031] 2. Rare earth gadolinium magnetic refrigeration material containing hydroxyl coordination: it belongs to the orthorhombic crystal system, the space group Cmcm, and the molecular formula is Gd 2 O(OH) 4 (H 2 O) 2 , the unit cell parameters are a=16.5835, b=12.9747, c=7.3106, V=1573.05. Its structural coordination mode is as figure 2 As shown, each asymmetric unit contains 1 Gd 3+ Ion, 1 / 2 O 2- Ion, 2 OH - ions and 1 water molecule. There are two crystallographically independent Gd 3+ ions (Gd1 and Gd2), Gd1 is eight-coordinated with six μ 3 -OH - , a μ 3 -O 2- and an H 2 O c...

Embodiment 3

[0035] magnetic test

[0036] Quantum Design SQUID MPMS magnetometer was used to test the rare earth gadolinium-containing magnetic refrigeration materials with hydroxyl coordination in the temperature range of 2-300K and the external magnetic field conditions of 1000Oe. Figure 4 It is the variable temperature magnetic susceptibility diagram of rare earth gadolinium-containing magnetic refrigeration materials with hydroxyl coordination. And the test is carried out in the temperature range of 2-10K and the magnetic field of 0-7T. Figure 5 It is the magnetization intensity diagram of the variable temperature and variable field of the rare earth gadolinium-containing magnetic refrigeration material with hydroxyl coordination. Figure 6 It is the magnetic entropy change diagram of rare earth gadolinium-containing magnetic refrigeration materials with hydroxyl coordination.

[0037] Figure 4 It shows that at room temperature, the rare earth gadolinium-containing magnetic refr...

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Abstract

The invention discloses tetrahydroxy gadolinium oxide dihydrate and preparation and applications thereof and relates to hydroxyl coordinate rare earth gadolinium materials. The tetrahydroxy gadolinium oxide dihydrate belongs to an orthorhombic system and a space group Cmcm and the molecular formula is Gd2O(OH)4(H2O)2. Cell parameters a is equal to 16.5835, b is equal to 12.9747, c is equal to 7.3106 and V is equal to 1573.05. During preparation, gadolinium nitrate hexahydrate, sodium formate and glycine are dissolved in water, the above is transferred to a reaction still after the pH (Potential Of Hydrogen) is adjusted through ammonium hydroxide, the temperature is risen to 160 degrees and the temperature keeps consistent, then the temperature is reduced to the room temperature, and the tetrahydroxy gadolinium oxide dihydrate which is colorless acicular crystal is obtained after filtering and washing. The tetrahydroxy gadolinium oxide dihydrate can be applied to preparation of magnetic refrigeration materials.

Description

technical field [0001] The invention relates to a hydroxyl-coordinated rare earth gadolinium material, in particular to digadolinium tetrahydroxide dihydrate and its preparation and application. 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 b...

Claims

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Application Information

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IPC IPC(8): C30B29/54C30B7/14C01F17/00C09K5/14
Inventor 龙腊生杨雁
Owner XIAMEN UNIV
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