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Titanium-doped barium ferrite ceramic material and preparation method thereof

A technology of barium ferrite and ceramic materials, which is applied in the field of titanium-doped barium ferrite ceramic materials and its preparation, can solve the problems of performance degradation, complicated preparation process, and difficulty in obtaining materials, and achieve high saturation magnetization and The effects of residual magnetization, simple preparation process and low cost

Active Publication Date: 2013-09-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the compounding of multiple materials is affected by the law of compounding, and the corresponding performance after compounding will be much lower than that of single-phase, and sometimes it is difficult to obtain ideal materials.
At present, through the introduction of the seepage effect, combined with some special processes, the composite materials obtained under certain conditions can have good dielectric properties and good magnetic permeability at the same time, and can be well obtained in related scientific and technological fields. application, but this kind of composite material is more complex than the preparation process, so the production cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Mix barium nitrate, ferric nitrate and citric acid in a molar ratio of 1:11.2:17.8, add deionized water to dissolve to obtain the first solution, and control the molar concentration of solute in the solution to 1.0mol / L;

[0021] 2) Mix tetrabutyl titanate and citric acid at a molar ratio of 1:1.5, dissolve in absolute ethanol to obtain a second solution, and control the molar concentration of the solute in the solution to 1.5mol / L;

[0022] 3) Slowly add the second solution to the first solution, and stir evenly to obtain the third solution, in which the molar ratio of tetrabutyl titanate to barium nitrate is controlled to be 4:5.

[0023] 4) Adjust the pH value of the third solution to 8 with ammonia water, then heat to evaporate the solvent, and then dry the obtained sol at 120°C to obtain a fluffy xerogel.

[0024] 5) The fluffy xerogel was heat-treated at 450°C for 2h, and then the product was heat-treated at 800°C for 2.0h to obtain a titanium-doped barium ferr...

Embodiment 2

[0029] 1) Mix barium nitrate, ferric nitrate and citric acid at a molar ratio of 1:11.4:18.1, add deionized water to dissolve to obtain the first solution, and control the molar concentration of solute in the solution to 1.0mol / L;

[0030] 2) Mix tetrabutyl titanate and citric acid at a molar ratio of 1:1.5, dissolve in absolute ethanol to obtain a second solution, and control the molar concentration of the solute in the solution to 1.5mol / L;

[0031] 3) Slowly add the second solution to the first solution, and stir evenly to obtain the third solution, in which the molar ratio of tetrabutyl titanate to barium nitrate is controlled to be 3:5.

[0032] 4) Adjust the pH value of the third solution to 7 with ammonia water, then heat to volatilize the solvent, and then dry the obtained sol at 120°C to obtain a fluffy xerogel.

[0033] 5) The fluffy xerogel was heat-treated at 450°C for 2h, and then the product was heat-treated at 900°C for 1.0h to obtain a titanium-doped barium fer...

Embodiment 3

[0038] 1) Mix barium nitrate, ferric nitrate and citric acid in a molar ratio of 1: 11.6: 18.4, add deionized water to dissolve to obtain the first solution, and control the molar concentration of solute in the solution to 1.0mol / L;

[0039] 2) Mix tetrabutyl titanate and citric acid at a molar ratio of 1:1.5, dissolve in absolute ethanol to obtain a second solution, and control the molar concentration of the solute in the solution to 1.5mol / L;

[0040] 3) Slowly add the second solution to the first solution, and stir evenly to obtain the third solution, in which the molar ratio of tetrabutyl titanate to barium nitrate is controlled to be 2:5.

[0041] 4) Adjust the pH value of the third solution to 6 with ammonia water, then heat to volatilize the solvent, and then dry the obtained sol at 120°C to obtain a fluffy xerogel.

[0042] 5) The fluffy xerogel was heat-treated at 450°C for 2h, and then the product was heat-treated at 850°C for 1.5h to obtain a titanium-doped barium f...

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PUM

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Abstract

The invention discloses a titanium-doped barium ferrite ceramic material and a preparation method thereof. Densification sintering of the ceramic material is achieved through titanium doping, and electron hopping and a nonuniform conduction structure are formed through the replacement of iron ions to titanium ions. The ceramic has high residual magnetization, and great dielectric constant can be produced by utilizing the nonuniform conduction structure. The preparation method of the titanium-doped barium ferrite ceramic comprises the following steps of: preparing a ceramic precursor through a citrate sol-gel method, and then molding and sintering at high temperature to obtain the titanium-doped barium ferrite ceramic, wherein the molar ratio of titanium to barium is controlled between 0.4 and 0.8; and the molar ratio of iron to barium is between 11.6 and 11.2. According to the titanium-doped barium ferrite ceramic material and preparation method thereof, the process is simple, the cost is low, and meanwhile extremely high dielectric constant, high saturation magnetization and residual magnetization can be obtained. The residual magnetization acts as an important multifunctional material and can be used for developing preparation of relative electronic components.

Description

technical field [0001] The invention relates to a titanium-doped barium ferrite ceramic material and a preparation method thereof. Background technique [0002] With the rapid development of communication technology and electronic technology, the integration, miniaturization and multi-function of electronic devices will be an important development direction. If a material has good dielectric properties and magnetic properties at the same time, such as maintaining high magnetization while having capacitive properties, it will play a very important role in the application of materials in the field of multifunctional devices. In general, materials with high dielectric and magnetic properties are usually achieved by compounding multiple materials. For example, certain dielectric properties and magnetic properties can be simultaneously obtained through the compounding of ferroelectric and ferromagnetic materials. However, the compounding of multiple materials is affected by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 杜丕一刘初阳贾敬国马宁程逵徐刚
Owner ZHEJIANG UNIV
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