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Application of coordination compound in low temperature magnetic refrigeration

A low-temperature magnetic refrigeration and complex technology, which is used in heat exchange materials, chemical instruments and methods, etc., can solve the problems of limited research and application in low-temperature regions, low reliability, low efficiency, etc., and achieves high magnetic entropy. Good effect, cheap and easy-to-obtain raw materials

Inactive Publication Date: 2013-06-12
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main method to obtain and maintain low temperature is to use the compression-expansion cycle of liquid helium, but its efficiency is low, the reliability is not high, and the temperature range below 2 K generally needs to use rare and expensive helium-3 , which limits the research and application of low temperature regions

Method used

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  • Application of coordination compound in low temperature magnetic refrigeration
  • Application of coordination compound in low temperature magnetic refrigeration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: At 40 K, 1 kg of dihydrate·bis(glycolic acid) manganese(II) was isothermally magnetized. When the applied magnetic field was 1 T, the obtained magnetic entropy became 2.3 J / K.

Embodiment 2

[0026] Example 2: At 40 K, 1 kg of dihydrate·di(glycolic acid) manganese(II) was isothermally magnetized. When the applied magnetic field was 3 T, the obtained magnetic entropy became 5.0 J / K.

Embodiment 3

[0027] Example 3: At 40 K, 1 kg of dihydrate·bis(glycolic acid) manganese(II) was isothermally magnetized. When the applied magnetic field was 5 T, the obtained magnetic entropy became 7.0 J / K.

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Abstract

The invention relates to an application of a coordination compound in low temperature magnetic refrigeration. The coordination compound is two-water two (glycolic acid) and manganese (II). The invention belongs to the technical field of manganese application. The application of coordination compound in low temperature magnetic refrigeration aims to provide a magnetic refrigeration working substance with a high refrigeration effect in a low temperature area. The temperature range of the two-water two (glycolic acid) and manganese (II) is 0.3K-40K. The magnetic field exerted in the magnetization stage when the coordination compound is used is 1T-7T. The two-water two (glycolic acid) and manganese (II) of 1kg is magnetized with isothermality when the temperature is 1.7K in the optimized implementation scheme. Obtained magnetic entropy change is 61.2J / K when the magnetic field exerted outside is 7T.

Description

technical field [0001] The invention relates to the technical field of application of manganese, and more specifically, relates to the application of a complex in low-temperature magnetic refrigeration. 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 main method to obtain and maintain low temperature is to use the compression-expansion cycle of liquid helium, but its efficiency is low, the reliability is not high, and the temperature range below 2 K generally needs to use rare and expensive helium-3 , which limits the research and application in the low temperature region. [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...

Claims

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Application Information

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IPC IPC(8): C09K5/08
Inventor 童明良陈龑骢刘俊良郭富盛冷际东贾建华
Owner SUN YAT SEN UNIV
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