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Orthorhombic phase Gd(OH)CO3, preparation method and application thereof

A technology of orthorhombic phase and orthorhombic crystal system, applied in chemical instruments and methods, rare earth metal compounds, single crystal growth, etc., can solve the problems of unreported applications and failure to obtain single crystals, and achieve good results and high Effect of magnetic entropy change and high stability

Inactive Publication Date: 2013-09-25
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Orthorhombic Gd(OH)CO3 has been discovered and reported as an MRI contrast agent, but researchers have been So far, only powder and microcrystalline samples have been prepared, but its single crystal has not been obtained, and its application in low-temperature magnetic refrigeration has not been reported.

Method used

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  • Orthorhombic phase Gd(OH)CO3, preparation method and application thereof
  • Orthorhombic phase Gd(OH)CO3, preparation method and application thereof
  • Orthorhombic phase Gd(OH)CO3, preparation method and application thereof

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Effect test

Embodiment 1

[0048] Mix gadolinium chloride hexahydrate and malononitrile at a molar ratio of 1:1, add water to dissolve in the reaction kettle, and keep the temperature at 180°C for 72 hours, take it out and cool down naturally, filter, wash, and dry to obtain the positive Cross-phase Gd(OH)CO 3 , the yield is about 30%.

Embodiment 2

[0050] Mix gadolinium chloride hexahydrate and malononitrile in a molar ratio of 1:2, add water to dissolve in the reaction kettle, and then keep the temperature at 180°C for 72 hours, take it out and cool down naturally, filter, wash, and dry to obtain the normal Cross-phase Gd(OH)CO 3 , the yield is about 40%.

Embodiment 3

[0052] Mix gadolinium chloride hexahydrate and malononitrile in a molar ratio of 1:3, add water to dissolve in the reactor, and keep the temperature at 180°C for 72 hours, take it out and cool down naturally, filter, wash, and dry to obtain the normal Cross-phase Gd(OH)CO 3 , The yield is about 48%.

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Abstract

The invention relates to the technical field of the application of gadolinium, and discloses an orthorhombic phase Gd(OH)CO3, and a preparation method and an application thereof. The orthorhombic phase Gd(OH)CO3 is a crystal which belongs to an orthorhombic system, the space group is Pnma, cell parameters are that a=7.0770(7) angstroms, b=4.8730(9) angstroms, c=8.4343(6) angstroms, and alpha=beta=gamma=90 degrees. The preparation method of the orthorhombic phase Gd(OH)CO3 comprises the following steps of mixing a gadolinium salt and malononitrile, adding a solvent to dissolve the mixture, and placing at a constant temperature and obtaining the orthorhombic phase Gd(OH)CO3. The orthorhombic phase Gd(OH)CO3 can replace magnetic refrigeration working mediums for use, and has a prominent magnetocaloric effect.

Description

technical field [0001] The present invention relates to the application technical field of gadolinium, more specifically, relate to a kind of orthorhombic Gd(OH)CO 3 And its preparation method and application. Background technique [0002] Cryogenic refrigeration technology plays a very important role in gas liquefaction, high energy physics, superconducting technology, aerospace and other fields. At present, the compression-expansion cycle of liquid helium is mainly used to obtain and maintain low temperature, but its efficiency is low and the reliability is not high, and the rare and expensive helium-3 is generally used in the temperature range below 2 K, which limits the low temperature range research and application. [0003] Magnetic refrigeration technology has the advantages of small device size, low noise, high reliability, refrigeration efficiency not limited by heat engine cycle, etc., and can be used in microgravity environments such as space. It is a strong co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C01F17/00
Inventor 童明良陈龑骢贾建华孟昭莎刘俊良郭富盛
Owner SUN YAT SEN UNIV
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