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Method for preparing hexagonal BeFe12O19 (barium ferrite) magnetic nano powder by microwave-hydrothemal method

A technology of befe12o19 and microwave hydrothermal method, applied in nanotechnology, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of complex process, complicated operation, poor repeatability, etc., and achieve low preparation cost, simple operation and fast speed Effect

Inactive Publication Date: 2012-06-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods are either complex in operation, or complex in process, long in cycle and poor in repeatability.

Method used

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  • Method for preparing hexagonal BeFe12O19 (barium ferrite) magnetic nano powder by microwave-hydrothemal method
  • Method for preparing hexagonal BeFe12O19 (barium ferrite) magnetic nano powder by microwave-hydrothemal method

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Step 1: Analytical pure barium nitrate and ferric nitrate nonahydrate are respectively configured into uniform solution A and uniform solution B of 0.01mol / L and 0.06mol / L;

[0015] Step 2: According to the Ba / Fe molar ratio of 1:6, add the B solution to the A solution, stir evenly, adjust the pH value to 8-13, and form a uniform co-precipitation precursor C;

[0016] Step 3: Pour the co-precipitation precursor C into the microwave hydrothermal reaction kettle, and the filling degree is controlled at 40%; then seal the reaction tank, put it into a microwave digestion instrument for multi-step reaction, and keep it warm at 100°C for 5 minutes, Insulate at 125°C for 5 minutes, at 150°C for 10 minutes, at 175°C for 15 minutes, at 180°C for 30 minutes, and cool to room temperature after the reaction is complete;

[0017] Step 4: Open the hydrothermal reaction tank, take out the material in the reaction tank and rinse with deionized water until the pH is 7, then calcinate at...

Embodiment 2

[0019] Step 1: Analytical pure barium nitrate and ferric nitrate nonahydrate are respectively configured into uniform solution A and uniform solution B of 0.01mol / L and 0.07mol / L;

[0020] Step 2: According to the Ba / Fe molar ratio of 1:7, add the B solution to the A solution, stir evenly, adjust the pH value to 9-12 respectively, and form a uniform co-precipitation precursor C;

[0021] Step 3: Pour the co-precipitation precursor C into the microwave hydrothermal reaction kettle, and the filling degree is controlled at 40%; then seal the reaction tank, put it into a microwave digestion instrument for multi-step reaction, and keep it warm at 100°C for 5 minutes, Insulate at 125°C for 5 minutes, at 150°C for 1 minute, at 175°C for 15 minutes, at 180°C for 30 minutes, and cool to room temperature after the reaction is complete;

[0022] Step 4: Open the hydrothermal reaction tank, take out the materials in the reaction tank and rinse with deionized water until the pH is 7, and f...

Embodiment 3

[0024] Step 1: Analytical pure barium nitrate and ferric nitrate nonahydrate are respectively configured into uniform solution A and uniform solution B of 0.01mol / L and 0.08mol / L;

[0025] Step 2: According to the Ba / Fe molar ratio of 1:8, add the B solution to the A solution, stir evenly, adjust the pH value to 10-13 respectively, and form a uniform co-precipitation precursor C;

[0026] Step 3: Pour the co-precipitation precursor C into the microwave hydrothermal reaction kettle, and the filling degree is controlled at 40%; then seal the reaction tank, put it into a microwave digestion instrument for multi-step reaction, and keep it warm at 100°C for 5 minutes, Insulate at 125°C for 5 minutes, at 150°C for 1 minute, at 175°C for 15 minutes, at 180°C for 30 minutes, and cool to room temperature after the reaction is complete;

[0027] Step 4: Open the hydrothermal reaction tank, take out the materials in the reaction tank and rinse with deionized water until the pH is 7, then...

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Abstract

The invention provides a method for preparing hexagonal BeFe12O19 (barium ferrite) magnetic nano powder by a microwave-hydrothemal method, which includes the steps of utilizing iron nitrate nonahydrate and barium nitrate as precursors to be dissolved in deionized water; then dropwise adding sodium hydroxide into liquor and adjusting pH (potential of hydrogen) within the range from 9 to 14 so that uniform precursor liquor is generated; pouring the precursor liquor into a hydrothermal reaction kettle prior to sealing; and performing microwave-hydrothermal synthesis for the hydrothermal reaction kettle placed in a microwave digestion system prior to cooling the reaction kettle to the room temperature, scrubbing products with deionized water and absolute ethyl alcohol for several times and calcining the scrubbed products at the temperature ranging from 800 DEG C to 1000 DEG C so that the hexagonal BeFe12O19 magnetic nano powder is obtained. The method for preparing the hexagonal BeFe12O19 magnetic nano powder by the microwave-hydrothemal method is low in preparing cost, simple in operation, short in reaction period and high in purity after the products are calcined, and crystal grains are complete in growth and uniform in distribution.

Description

technical field [0001] The invention relates to a preparation method of nano-magnetic powder, in particular to a microwave hydrothermal method for preparing hexagonal BeFe 12 o 19 A method for magnetic nanopowders. Background technique [0002] Magnetoplumbite-type barium ferrite (BeFe 12 o 19 ) is a ferromagnetic substance with hexagonal crystal structure, uniaxial magnetocrystalline anisotropy with good chemical stability and corrosion resistance, c-axis is easy to magnetize, has large coercive force and magnetic energy product, and is mainly used as Magnetic recording materials, absorbing materials and permanent magnetic materials have been widely used. [0003] In recent years, with the continuous development of material science, especially nanotechnology, the performance of ferrite materials has been greatly improved and enhanced. Due to the special surface effect, volume effect and quantum tunneling effect of nanomaterials, it is of great significance for the furt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82Y40/00
Inventor 蒲永平石轩刘丹
Owner SHAANXI UNIV OF SCI & TECH
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