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Preparation of rare-earth oxide nano magnetic refrigeration material

A technology of rare earth oxides and nano-magnetism, applied in the direction of rare earth metal compounds, chemical instruments and methods, heat exchange materials, etc., can solve the problems of impure phase, poor crystallization of products, low stability of alkoxides, etc., and achieve repeatable Good performance, low crystallization and sintering temperature, and simple process

Inactive Publication Date: 2009-06-24
GUANGDONG OCEAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the doped component elements are more, the sample preparation process is difficult to control
Moreover, the stability of the alkoxide used in the preparation process is generally low, and the composition of the hydrolyzate is affected by the hydrolysis process.
Therefore, B.Liu et al [J.B.Liu, H.Wang, M.K.Zhu, etal.Materials Research Bulletin, 2003, 38:817-822] prepared perovskite at a low temperature of 200-240°C by hydrothermal synthesis Structure rare earth oxide nanomaterials, but the difficulties in hydrothermal synthesis are mainly that impure phases are easily generated in multi-component complex systems, the crystallization state of the product is poor, and the size distribution of the product is not uniform, which will affect the magnetocaloric effect of the material. have a big impact
The main reason is that the multi-component complex system is prone to impure phases, the crystallization state of the product is poor, and the size distribution of the product is uneven, etc., which will have a great impact on the magnetocaloric effect of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] LaCO 3 、DyCO 3 , SrCO 3 ,, MnCO 3 According to the stoichiometric ratio of 0.57:0.1:0.33:1, mix well, and then add 2.4 moles of H to the mixture 5 DTPA and 2 moles of ethylene glycol. Add an appropriate amount of deionized water to the above mixture, heat to 80°C and stir to dissolve the mixture completely to obtain a transparent solution. After the solution is filtered, slowly evaporate at 60°C, remove excess solvent water until a transparent glassy substance is formed, and finally dry for 48 hours After that, an amorphous complex precursor is obtained. First, heat the furnace to 500°C at a heating rate of 10°C / min and keep it warm for 2 hours, then take out the sample and cool it, and press it into a thin sheet with a diameter of 10mm. Then put the sheet into a box-type resistance furnace, heat the furnace to 800°C at a heating rate of 18°C / min, and keep it warm for 6 hours. Turn off the power to stop heating, and take out the sample after the furnace cools down....

Embodiment 2

[0017] LaCO 3 , GdCO 3 , SrCO 3 ,, MnCO 3 According to the stoichiometric ratio of 0.47:0.2:0.33:1, mix well, and then add 3 moles of H to the mixture. 5 DTPA and 2.4 moles of ethylene glycol. Add an appropriate amount of deionized water to the above mixture, heat to 80°C and stir to dissolve the mixture completely to obtain a transparent solution. After the solution is filtered, slowly evaporate at 60°C, remove excess solvent water until a transparent glassy substance is formed, and finally dry for 54 hours After that, an amorphous complex precursor is obtained. Firstly, heat the furnace to 500°C at a heating rate of 8°C / min, keep it warm for 1 hour, then take out the sample and cool it, and press it into a thin sheet with a diameter of 10mm. Then put the sheet into a box-type resistance furnace, heat the furnace to 800°C at a heating rate of 15°C / min, and keep it warm for 10 hours. Turn off the power to stop heating, and take out the sample after the furnace cools down....

Embodiment 3

[0019] LaCO 3 、CeCO 3 , SrCO 3 ,, MnCO 3 According to the stoichiometric ratio of 0.57:0.1:0.33:1, mix well, and then add 2.6 moles of H to the mixture. 5 DTPA and 3 moles of ethylene glycol. Add an appropriate amount of deionized water to the above mixture, heat to 80°C and stir to dissolve the mixture completely to obtain a transparent solution. After the solution is filtered, slowly evaporate at 60°C, remove excess solvent water until a transparent glassy substance is formed, and finally dry for 56 hours After that, an amorphous complex precursor is obtained. First, heat the furnace to 500°C at a heating rate of 5°C / min and keep it warm for 1.5h, then take out the sample and cool it, then press it into a 10mm sheet. Then put the sheet into a box-type resistance furnace, heat the furnace to 1000°C at a heating rate of 18°C / min, and keep it warm for 10 hours. Turn off the power to stop heating, and take out the sample after the furnace cools down. The particle size of t...

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Abstract

The invention relates to a method for preparing a rare earth oxide nano magnetic refrigerant material. The method comprises: mixing LaCO3, MnCO3, diethylenetriamine pentaacetic acid and glycol, adding deionized water into the mixture, heating and stirring the mixture for dissolution, filtering the mixture and obtaining a noncrystal precursor by drying; and placing the precursor in a box type resistance furnace for heating treatment, controlling the heating speed and temperature, keeping the temperature and then cooling the precursor to obtain the rare earth oxide nano magnetic refrigerant material. The method is simple in technical process, good in repeatability, low in crystallization and sintering temperature, adjustable in metal element proportion according to requirement and low in cost.

Description

technical field [0001] The invention relates to the field of magnetic refrigeration functional materials, in particular to a preparation method of a perovskite structure rare earth oxide nano magnetic refrigeration material. Background technique [0002] Perovskite-structured rare earth oxides exhibit a unique gigantic magnetoresistance effect due to the intrinsic strong carrier-spin coupling, accompanied by a giant magnetic entropy change. In addition, the perovskite structure rare earth oxide has the advantages of high chemical stability, high resistivity, easy manufacture, low cost, light specific gravity, and non-toxic, and is a promising magnetic refrigerant. Therefore, domestic and foreign scholars have conducted extensive research on the preparation and magnetocaloric effect of perovskite structure rare earth oxides. [0003] Traditional perovskite structure rare earth oxide materials are generally prepared by solid-state reaction method, which usually requires highe...

Claims

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Application Information

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IPC IPC(8): C01F17/00C09K5/00
Inventor 王贵赵娟余江李丽荣
Owner GUANGDONG OCEAN UNIVERSITY
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