Softening method for producing ferroelectric and ferromagnetic composite material powder by home position

A composite material and in-situ preparation technology, which is applied in the field of soft chemical method to prepare ferrite/ferroelectric composite materials with magnetoelectric effect, and achieves the effect of simple and easy process, high purity and fine powder particles.

Inactive Publication Date: 2006-05-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is mainly to solve the problem of the influence of macroscopic mixing on coupling in the solid phase sintering method of ferroelectric and ferromagnetic composite materials, and to provide a soft chemical method for preparing ferroelectric and ferromagnetic composite material powder in situ

Method used

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  • Softening method for producing ferroelectric and ferromagnetic composite material powder by home position
  • Softening method for producing ferroelectric and ferromagnetic composite material powder by home position
  • Softening method for producing ferroelectric and ferromagnetic composite material powder by home position

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: 0.5Ni 0.5 Co 0.028 Zn 0.472 Fe 2 O 4 -0.5Ba(Zr 0.05 Ti 0.95 )O 3 Powder preparation

[0017] Add 0.0125mol of nickel nitrate, 0.0007mol of cobalt nitrate, 0.0118mol of zinc nitrate, 0.025mol of barium nitrate, and 0.00125mol of zirconium nitrate to 150g of deionized water, then add 0.255mol of citric acid, and heat and stir in a water bath at 70°C for 2 hours, then slowly Slowly add 0.02375 mol of tetrabutyl titanate, after stirring to form a uniform solution, add ammonia water to adjust the PH=6.5, and continue to stir for 8 hours to form a stable and uniform sol. Dry the prepared sol in a drying oven at 150°C, and bake it in a drying oven at 250°C after the moisture is completely volatilized until it burns. After burning, the powder is sintered in a muffle furnace at 900°C for 1.5 hours to obtain the desired Powder.

[0018] Because the total molar amount of nitrate is greater than 5 times the molar amount of metal alkoxide, the molar amount of citric acid is t...

Embodiment 2

[0019] Example 2: 0.2Ni 0.5 Co 0.028 Zn 0.472 Fe 2 O 4 -0.8Ba(Zr 0.05 Ti 0.95 )O 3 Powder preparation

[0020] Add 0.19mol citric acid to 150g deionized water, then add 0.005mol nickel nitrate, 0.00028mol cobalt nitrate, 0.00472mol zinc nitrate, 0.04mol barium nitrate, 0.002mol zirconium nitrate, heat and stir in a water bath at 75℃ for 2 hours, then slowly Slowly add 0.038 mol of tetrabutyl orthotitanate, and after stirring to form a uniform solution, add ammonia to adjust the PH=7, and continue to stir for 7 hours to form a stable and uniform sol. Dry the prepared sol in a drying oven at 140°C, and bake it in a drying oven at 260°C after the moisture is completely volatilized until it burns. After burning, the powder is sintered in a muffle furnace at 850°C for 2 hours to obtain the desired Powder.

[0021] Because the total molar amount of nitrate is less than 5 times the molar amount of metal alkoxide, the molar amount of citric acid is 5 times the molar amount of metal alkoxi...

Embodiment 3

[0022] Example 3: 0.5Ni 0.2 Cu 0.2 Zn 0.6 Fe 2 O 4 -0.5Ba(Zr 0.05 Ti 0.95 )O 3 Powder preparation

[0023] Add 0.005mol of nickel nitrate, 0.005mol of copper nitrate, 0.015mol of zinc nitrate, 0.025mol of barium nitrate, and 0.00125mol of zirconium nitrate to 150g of deionized water, then add 0.255mol of citric acid, heat and stir in a water bath at 80°C for 2 hours, and then slowly Slowly add 0.02375 mol of tetrabutyl orthotitanate, after stirring to form a uniform solution, add ammonia water to adjust the PH=6.5, and continue to stir for 8 hours to form a stable and uniform sol. Dry the prepared sol in a drying oven at 130°C, and bake it in a drying oven at 250°C after the moisture is completely volatilized until it burns. After burning, the powder is sintered in a muffle furnace at 900°C for 2 hours to obtain the desired Powder.

[0024] Because the total molar amount of nitrate is greater than 5 times the molar amount of metal alkoxide, the molar amount of citric acid is the t...

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Abstract

A soft chemical method for in-situ preparing powder with ferroelectric and ferromagnetic composite materials is carried out by adding ferrite metal nitrate and ferroelectric metal nitrate into citric acid solution, heating, stirring, adding into ferroelectric metal alkoxide, adjusting pH value, obtaining homogeneous and stable sol, preparing powder, drying the obtained precursor, baking, burning and heat treating the burnt powder to obtain the final powder. It is cheap and simple, and has better chemical evenness, high purity and fine particles.

Description

Technical field [0001] The invention relates to the preparation of ferroelectric ferromagnetic functional materials, in particular to the preparation of ferrite / ferroelectric composite materials with magnetoelectric effect by soft chemical methods. Background technique [0002] Ferroelectric ferromagnetic composite material is a new material with ferroelectric conversion function. It is composed of two single-phase materials-ferroelectric phase and ferromagnetic phase. The magnetoelectric conversion function of the ferroelectric ferromagnetic composite material is realized by the product effect of the ferroelectric phase and the ferromagnetic phase, and this product effect is the magnetoelectric effect. Due to the unique properties of ferroelectric-ferromagnetic composite materials, it has a wide range of important applications in the microwave field, current measurement of high-voltage transmission lines, wide-band magnetic detection, magnetic field sensors, etc., especially mic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/624
Inventor 乔利杰潘德安宿彦京
Owner UNIV OF SCI & TECH BEIJING
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