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Ferromagnetic nano alpha-Fe2O3 with iron defects, and preparation method thereof

A ferromagnetic, -fe2o3 technology, applied in the field of ferromagnetic nano-α-Fe2O3 and its preparation, can solve the problems of metal defects and other problems, and achieve the effect of low synthesis cost and strong magnetism

Active Publication Date: 2017-02-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current technical conditions in α-Fe 2 o 3 It is relatively easy to introduce oxygen vacancies, but it is very difficult to introduce metal vacancies, and there is no literature or patent report

Method used

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  • Ferromagnetic nano alpha-Fe2O3 with iron defects, and preparation method thereof
  • Ferromagnetic nano alpha-Fe2O3 with iron defects, and preparation method thereof
  • Ferromagnetic nano alpha-Fe2O3 with iron defects, and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0033] Example 1: Mix 1 g of iron acetate, 20.0 g of glycerin and 100 mL of ethanol, and stir to obtain a homogeneous solution that is transferred to an autoclave polytetrafluoro liner. Put the polytetrafluoroethylene liner into the autoclave, seal it, place it in a constant temperature oven, and react in the oven at 120°C for 6.0h. After the reaction is over, the autoclave is quenched. After the autoclave was cooled to room temperature, the hydrothermal precipitate was taken out, and after being centrifuged and washed with ethanol, it was dried. The dried powder was calcined at 700 °C for 2 h in a muffle furnace, and then cooled naturally. The prepared samples showed strong ferromagnetism, the saturation magnetization was 13emu / g, and the coercive force was 1200Oe.

example 2

[0034] Example 2: 3g ferric oxalate, 24.0g glycerin and 200mL ethanol were mixed, and the homogeneous solution obtained by stirring was transferred to an autoclave polytetrafluoro liner. Put the polytetrafluoroethylene liner into the autoclave, seal it and place it in a constant temperature oven, and react in the oven at 100°C for 15.0h. After the reaction is over, the autoclave is quenched. After the autoclave was cooled to room temperature, the hydrothermal precipitate was taken out, and after being centrifuged and washed with ethanol, it was dried. The dried powder was calcined at 600 °C for 4 h in a muffle furnace, and then cooled naturally. The prepared samples showed strong ferromagnetism, the saturation magnetization was 20emu / g, and the coercive force was 1600Oe.

example 3

[0035]Example 3: Mix 0.5 g of ferric citrate, 10.0 g of glycerin and 50 mL of ethanol, and stir to obtain a homogeneous solution that is transferred to an autoclave polytetrafluoro liner. Put the polytetrafluoroethylene liner into the autoclave, seal it and place it in a constant temperature oven, and react in the oven at 180°C for 2.0h. After the reaction is over, the autoclave is quenched. After the autoclave was cooled to room temperature, the hydrothermal precipitate was taken out, and after being centrifuged and washed with ethanol, it was dried. The dried powder was calcined at 400 °C for 8 h in a muffle furnace, and then cooled naturally. The prepared samples showed strong ferromagnetism, the saturation magnetization was 15emu / g, and the coercive force was 1300Oe.

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Abstract

The invention discloses a ferromagnetic nano alpha-Fe2O3 with iron defects, and a preparation method thereof. According to the ferromagnetic nano alpha-Fe2O3 with iron defects, the molar ratio of Fe atom to O atom is controlled to be smaller than 1:1.5.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a ferromagnetic nanometer α-Fe with iron defects 2 o 3 and its preparation method. Background technique [0002] Defects play an important role in the physical and chemical applications of metal oxides. The current techniques for introducing defects into metal oxides mainly include doping, sputtering, and firing. For the preparation of defective metal oxide α-Fe 2 o 3 , the introduction and regulation of its oxygen vacancies have been widely reported at present, and the metal vacancies have not been reported yet due to the difficulty of preparation. [0003] Chen et al. exposed Fe flakes to oxygen plasma and oxidized them to form α-Fe containing oxygen vacancies. 2 o 3 . α-Fe was derived by characterization and calculation 2 o 3 There are two kinds of oxygen defects, and the growth directions of the two kinds of defects are parallel. The formation of this defect is d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06
CPCC01G49/06C01P2002/72C01P2004/04C01P2006/42
Inventor 邹吉军潘伦张香文王莅
Owner TIANJIN UNIV
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