Hexagonal sheet-like barium ferrite magnetic nanometer powder preparation method

A magnetic nano, hexagonal flake technology, applied in the field of material science, can solve the problem of low product yield and achieve the effect of good crystal form, high purity and simple process flow

Inactive Publication Date: 2006-12-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recently, it has been reported that BaFe with hexagonal sheet structure has been synthesized by hydrothermal method (see Liu, X.; Wang, J.; Gan, L.; Ng, S.J.Magn.Magn.Mater., 1999, 195:452). 12 o 19 powder, but during preparation [OH - ] / [NO 3 - ] have a greater impact on the phase and morphology of the product; in addition, due to the limitation of the preparation method, the output of the product is not high

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  • Hexagonal sheet-like barium ferrite magnetic nanometer powder preparation method

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Effect test

Embodiment 1

[0022] powdered BaCO 3 The mixture of FeO(OH) powder with nanoscale fineness is the precursor. In the precursor mixture, BaCO 3 The molar ratio of FeO(OH) and FeO(OH) is 1:8~1:12. according to figure 1 , figure 2 From the above, it can be known that the main components of the precursor are FeO(OH), BaCO 3 Another essential component of the precursor.

[0023] Put the precursor product into the muffle furnace, and raise the temperature at a uniform rate (10□ / min) to the required temperature of 700-900°C for calcination (the preferred calcination temperature is 740-850°C); ~3.5 hours); finally, naturally cool to room temperature with the furnace body to obtain BaFe with hexagonal sheet structure 12 o 19 Nano powder.

[0024] According to attached Figure 4 Analysis shows that the product obtained after calcination is pure BaFe 12 o 19 Phase: refer to attached Figure 4 , X-ray diffraction analysis showed that the product BaFe 12 o 19 Each characteristic diffractio...

Embodiment 2

[0027] BaCO with a fineness of nanoscale 3 The mixture of powder and FeO(OH) powder with nanoscale fineness is the precursor. In the precursor mixture, BaCO 3 The molar ratio of FeO(OH) and FeO(OH) is 1:9. according to figure 1 , figure 2 From the above, it can be known that the main components of the precursor are FeO(OH), BaCO 3 Another essential component of the precursor.

[0028] Put the precursor product into the muffle furnace, raise the temperature at a constant speed (10□ / min) to 740°C; then keep it warm for 2.5 hours; finally cool down to room temperature naturally with the furnace body, and then get BaFe with hexagonal sheet structure 12 o 19 Nano powder.

[0029] According to attached Figure 4 Analysis shows that the product obtained after calcination is pure BaFe 12 o 19 Phase: refer to attached Figure 4 , X-ray diffraction analysis showed that the product BaFe 12 o 19 Each characteristic diffraction peak of the phase (JCPDS FileNo.39-1433) is clearl...

Embodiment 3

[0032] BaCO with a fineness of nanoscale 3 The mixture of powder and FeO(OH) powder with nanoscale fineness and spindle-shaped microscopic shape is the precursor. In the precursor mixture, BaCO 3 The molar ratio of FeO(OH) and FeO(OH) is 1:12. according to figure 1 , figure 2 From the above, it can be known that the main components of the precursor are FeO(OH), BaCO 3 Another essential component of the precursor.

[0033] Put the precursor product into the muffle furnace, raise the temperature at a constant speed (10□ / min) to 850°C); then keep it warm for 3.5 hours; finally cool down to room temperature naturally with the furnace body, and then get BaFe with a hexagonal sheet structure 12 o 19 Nano powder.

[0034] According to attached Figure 4 Analysis shows that the product obtained after calcination is pure BaFe 12 o 19 Phase: refer to attached Figure 4 , X-ray diffraction analysis showed that the product BaFe 12 o 19 Each characteristic diffraction peak of...

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Abstract

A preparing method of hexagonal piece barium ferrite nanometer magnetic powder includes: the predecessor body composed with the mixture of powdered BaCO3 and FeO(OH) powder the fineness of which belongs to nanometer is burnt for hexagonal piece barium ferrite nanometer magnetic powder. The optimal fineness of powered BaCO3 is nanometer and optimal nanometer FeO(OH) powder is the spindly FeO(OH) powder. The invention is suitable for application of perpendicular magnetic recording medium of high density and microwave absorber. The invention has the outstanding advantages as follows: well energy conservation effect for low calcinations heat and short calcinations time; high purity and good crystal model; simple process, low level demand for production facility, that is suitable for mass production in industry.

Description

Technical field: [0001] The present invention relates to material science, particularly provides a kind of hexagonal barium ferrite (BaFe 12 o 19 ) Preparation method of magnetic nano powder. Background technique: [0002] Barium ferrite (BaFe 12 o 19 ) magnetic powder is widely used in the field of magnetic materials due to its excellent magnetic properties and good chemical stability (see Pankov, V.V.; Pernet, M.; Germi, P.; Lard, P.M.J.Magn.Magn.Mater., 1993, 120:69). As a granular magnetic recording medium, BaFe 12 o 19 The size of powder particles is gradually developing from micron and submicron to nanoscale, which lays the foundation for the research of high-density magnetic recording materials. BaFe with hexagonal sheet structure 12 o 19 , its easy axis of magnetization is the normal direction of the hexagonal plane, which can realize high-density perpendicular magnetic recording (see Si Xinwen, Song Baozhen, Gan Yaokun, Bai Chendong, Zhang Jian, Chemical Me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/64
Inventor 李永锐祖亚培石南林郭雪梅
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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