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A polyaniline-doped BaFe<12>O<19>/CoFe2O4 wave-absorbing material and a preparing method thereof

A technology of bafe12o19 and xbafe12o19, which is applied in the field of polyaniline-doped BaFe12O19/CoFe2O4 absorbing materials and its preparation, can solve the problems of limited application range, low saturation magnetization, poor impedance matching characteristics, etc., achieve good exchange coupling effect and improve impedance Matching characteristics, effects of high saturation magnetization

Inactive Publication Date: 2016-04-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of ferrite magnetic absorbing materials is that the real part of the complex permittivity and the real part of the complex permeability are small
High density, low saturation magnetization, low Curie temperature and poor high temperature stability, so the application range is limited
Ferrite has good magnetic properties, and polyaniline has excellent electrical conductivity, making it poor in impedance matching characteristics and poor in absorbing performance when used alone

Method used

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  • A polyaniline-doped BaFe&lt;12&gt;O&lt;19&gt;/CoFe2O4 wave-absorbing material and a preparing method thereof
  • A polyaniline-doped BaFe&lt;12&gt;O&lt;19&gt;/CoFe2O4 wave-absorbing material and a preparing method thereof
  • A polyaniline-doped BaFe&lt;12&gt;O&lt;19&gt;/CoFe2O4 wave-absorbing material and a preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of polyaniline doped BaFe 12 o 19 / CoFe 2 o 4 The preparation method of wave-absorbing material comprises the following steps:

[0033] 1) According to the general chemical formula xBaFe 12 o 19 / (1-x)CoFe 2 o 4 , the analytically pure Ba(NO 3 ), Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O and C 6 h 8 o 7 ·H 2 O dissolved in deionized water, C 6 h 8 o 7 ·H 2 The amount of O (citric acid) is 3 times that of the total amount of metal ions, then dropwise add ammonia water to adjust the pH value to 6.8, stir evenly at 75°C and dry to obtain the xerogel; then grind the xerogel, and calcined at 950°C for 5 hours to obtain xBaFe 12 o 19 / (1-x)CoFe 2 o 4 Composite powder; wherein, x is 0.9;

[0034] 2) Add 0.5gxBaFe 12 o 19 / (1-x)CoFe 2 o 4 The composite powder was dissolved in 50mL of 1mol / L hydrochloric acid solution, and after stirring for 30 minutes, aniline was added to obtain a mixed solution; among them, xBaFe 12 o 19 / (1-x)CoFe 2 o 4...

Embodiment 2

[0040] A kind of polyaniline doped BaFe 12 o 19 / CoFe 2 o 4 The preparation method of wave-absorbing material comprises the following steps:

[0041] 1) According to the general chemical formula xBaFe 12 o 19 / (1-x)CoFe 2 o 4 , the analytically pure Ba(NO 3 ), Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O and C 6 h 8 o 7 ·H 2 O dissolved in deionized water, C 6 h 8 o 7 ·H 2 The amount of O (citric acid) is 3 times that of the total amount of metal ions, then dropwise add ammonia water to adjust the pH value to 7, stir evenly at 85°C and dry to obtain the xerogel; then grind the xerogel, and calcined at 1100°C for 3 hours to obtain xBaFe 12 o 19 / (1-x)CoFe 2 o 4 Composite powder; wherein, x is 0.8;

[0042] 2) Add 0.5gxBaFe 12 o 19 / (1-x)CoFe 2 o 4 The composite powder was dissolved in 50mL of 1mol / L hydrochloric acid solution, and after stirring for 40 minutes, aniline was added to obtain a mixed solution; among them, xBaFe 12 o 19 / (1-x)CoFe 2 o 4 ...

Embodiment 3

[0048] A kind of polyaniline doped BaFe 12 o 19 / CoFe 2 o 4 The preparation method of wave-absorbing material comprises the following steps:

[0049] 1) According to the general chemical formula xBaFe 12 o 19 / (1-x)CoFe 2 o 4 , the analytically pure Ba(NO 3 ), Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O and C 6 h 8 o 7 ·H 2 O dissolved in deionized water, C 6 h 8 o 7 ·H 2 The amount of O (citric acid) is 3 times that of the total amount of metal ions, then dropwise add ammonia water to adjust the pH value to 7.3, stir evenly at 80°C and dry to obtain a xerogel; then grind the xerogel, and calcined at 980°C and kept for 4 hours to obtain xBaFe 12 o 19 / (1-x)CoFe 2 o 4 Composite powder; wherein, x is 0.7;

[0050] 2) Add 0.5gxBaFe 12 o 19 / (1-x)CoFe 2 o 4 The composite powder was dissolved in 50mL of 1mol / L hydrochloric acid solution, and after stirring for 50 minutes, aniline was added to obtain a mixed solution; among them, xBaFe 12 o 19 / (1-x)CoFe ...

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Abstract

A polyaniline-doped BaFe<12>O<19> / CoFe2O4 wave-absorbing material and a preparing method thereof are disclosed. The method includes dissolving xBaFe<12>O<19> / (1-x)CoFe2O4 composite powder into a hydrochloric acid solution with the x being 0.6-0.9, fully stirring, adding polyaniline to obtain a solution mixture, continuously stirring the solution mixture in an ice water bath, adding a hydrochloric acid solution of ammonium persulfate, reacting for 8-15 h, washing, and drying to obtain PANI / xBaFe<12>O<19> / (1-x)CoFe2O4 composite powder. By combining different wave-absorbing materials, impedance matching properties are improved and wave-absorbing capability is improved. The BaFe<12>O19 and the CoFe2O4 have good exchange coupling effects, thus increasing the magnetic energy product, improving the impedance matching properties so as to optimize a wave-absorbing property and to prepare the wave-absorbing material with good properties.

Description

technical field [0001] The invention belongs to the field of material science and relates to a polyaniline doped BaFe 12 o 19 / CoFe 2 o 4 Absorbing material and preparation method. Background technique [0002] With the rapid development of electronic technology, people are exposed to more and more electromagnetic radiation in their daily life. At the same time, in order to meet the needs of modern warfare, stealth materials will be widely used in weapons. Therefore, the research on absorbing materials has important practical value. The absorbing material is a kind of energy conversion material, which can effectively absorb electromagnetic waves, and dissipate electromagnetic energy through energy conversion or make electromagnetic waves disappear due to interference. The microwave absorption characteristics of a substance mainly depend on its dielectric properties (complex permittivity, ε=ε'-jε"), magnetic properties (complex permeability, μ=μ'-jμ"), etc. Therefore, ab...

Claims

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Application Information

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IPC IPC(8): C08G73/02C08K3/24C01G51/00C01G49/00
CPCC08G73/0266C01G49/00C01G51/00C01P2004/80C01P2006/42C08K3/24
Inventor 杨海波叶婷林营朱建锋王芬
Owner SHAANXI UNIV OF SCI & TECH