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Prepn process of spinel type nanometer composite ferrite material

A nano-composite material and spinel-type technology, which is applied in the field of preparation of spinel-type ferrite nano-composite materials, can solve the problems of difficult preparation of nano-composite materials with high ferrite content, time-consuming gelation, high energy consumption, etc. problems, to achieve the effect of easy control of the process, cheap raw materials, and simple methods

Inactive Publication Date: 2005-07-13
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Synthesis of spinel-type ferrite / SiO by sol-gel method using TEOS (orthoethyl silicate) as the precursor of silica 2 Nanocomposite materials, because the formation of gel is time-consuming, and must be calcined at high temperature to obtain spinel phase ferrite, which consumes a lot of energy
Not suitable for large-scale industrial production
And it is difficult to prepare nanocomposites with high ferrite content through this process, and some impurity phases such as α-Fe in the final product 2 o 3 hard to prevent
This is because it is difficult to obtain a uniform and stable sol when the amount of TEOS is small

Method used

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Examples

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Effect test

Embodiment 1

[0011] Preparation of SiO 2 10% by weight (Mn 0.3 Zn 0.7 )Fe 2 o 4 / SiO 2 Nanocomposites, TEOS / EtOH / H 2 The ratio of O was adjusted at 1:2:5, acetic acid was added to adjust the pH value of the solution to about 2, and the precursor solution was kept at 50°C for 2 hours, and TEOS was hydrolyzed to obtain a transparent and viscous sol I; the Fe(NO 3 ) 3 , Mn(NO 3 ) 2 , Zn(NO 3 ) 2 and citric acid were dissolved in deionized water to form solution II, and the molar ratio of citric acid / various metal ions was 2:3. Mix Sol I and Solution II, control the concentration of citric acid in the final solution to 1.5mol / l, add a small amount of ammonia water, adjust the pH value to 5, evaporate the solution at 70°C to obtain a transparent sol, and then dry it at 110°C for 12 hours Gel, the dry gel is ignited in the air to obtain a reddish-brown bulky powder (Mn 0.3 Zn 0.7 )Fe 2 o 4 / SiO 2 nanocomposites.

Embodiment 2

[0013] Preparation of SiO 2 20% by weight (Ni 0.5 Zn 0.5 )Fe 2 o 4 / SiO 2 Nanocomposites, TEOS / EtOH / H 2 The ratio of O was adjusted at 2:3:7, acetic acid was added to adjust the pH value of the solution to about 3, and the precursor solution was kept at 60°C for 3 hours, and TEOS was hydrolyzed to obtain a transparent and viscous sol I; Fe(NO 3 ) 3 , Ni(NO 3 ) 2 , Zn(NO 3 ) 2 and citric acid were dissolved in deionized water to form solution II, and the molar ratio of citric acid / various metal ions was 1:3. Mix sol I and solution II, control the concentration of citric acid in the final solution to 2mol / l, add a small amount of ammonia water, adjust the pH value to 8, evaporate the solution at 90°C to obtain a transparent sol, and then dry it at 150°C for 12 hours to obtain dry coagulation Glue, the xerogel is ignited in the air to obtain a reddish-brown bulky powder (Ni 0.5 Zn 0.5 )Fe 2 o 4 / SiO 2 nanocomposites.

Embodiment 3

[0015] Preparation of SiO 2 60% by weight ZnFe 2 o 4 / SiO 2 Nanocomposites, TEOS / EtOH / H 2 The ratio of O was adjusted at 3:2:9, acetic acid was added to adjust the pH value of the solution to about 3, and the precursor solution was maintained at 70°C for 4 hours, and TEOS was hydrolyzed to obtain a transparent and viscous sol I; Fe(NO 3 ) 3 , Zn(NO 3 ) 2 and citric acid were dissolved in deionized water to form solution II, and the molar ratio of citric acid / various metal ions was 1:2. Mix sol I and solution II, control the concentration of citric acid in the final solution to 1.5mol / l, add a small amount of ammonia water, adjust the pH value to 8, evaporate the solution at 90°C to obtain a transparent sol, and then dry it at 140°C for 8 hours Gel, the dry gel is ignited in the air to obtain a reddish-brown bulky powder, which is ZnFe 2 o 4 / SiO 2 nanocomposites.

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Abstract

The preparation process of spinel type nanometer composite ferrite material is the organic combination of sol-gel process and low temperature combustion synthesis and is intense oxidation-reduction practically. During forming sol, fuel or oxidant, such as citric acid, is introduced, the sol is dewatered and ignited in air, and oxidant and nitrate react to produce high temperature to promote the formation of spinel type ferrite. The present invention has the demerits of traditional method overcome and obtains spinel type nanometer composite ferrite AFe2o4 / SiO2 material directly through combustion in a fast simple process with low power consumption.

Description

technical field [0001] The invention belongs to a preparation method of a spinel type ferrite nanocomposite material. Background technique [0002] The structure formula of spinel type soft magnetic ferrite is (A x B 1-x )Fe 2 o 4 , where A, B are divalent metal ions, such as Ni, Zn, Mn, etc. Nano-spinel ferrite materials have low melting point, high specific heat, large expansion coefficient, low saturation magnetic moment, high magnetic susceptibility, and wide light absorption frequency. The characteristics different from conventional materials are mainly manifested in : Superparamagnetic, high coercivity, low Curie temperature and high magnetic susceptibility. Due to its extremely high resistivity and good magnetic spectrum characteristics, it is very suitable for high frequency and ultra high frequency applications, so it is widely used as magnetic head materials, giant magnetic materials, microwave magnetic materials, etc. However, nanomaterials have large surfac...

Claims

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Application Information

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IPC IPC(8): C04B35/14C04B35/26C04B35/624
Inventor 颜世峰周恩乐
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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