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Barium titanate and barium ferrite composite powder with nucleus shell structure and preparation method thereof

A technology for constructing barium titanate and barium ferrite, which is applied in the fields of core-shell structure barium titanate-barium ferrite composite powder material and preparation thereof, ferroelectric-ferromagnetic multifunctional composite powder material and preparation field thereof , can solve the problems of product purity limitation, complicated operation, expensive organic coupling agent, etc., and achieve the effect of strong magnetoelectric coupling coefficient and simple preparation method.

Inactive Publication Date: 2011-06-15
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In many examples of preparing core-shell particles by chemical precipitation, strong base precipitants such as NaOH and KOH are often used, which makes it difficult to control the supersaturation of the solution. The precipitation coating process is accompanied by a large number of homogeneous nucleation processes, resulting in core-shell particles. There are often a large number of independent shell particles mixed in the body, the purity of the product is limited, and the difficulty of separation is also increased.
Although the purity of the product can be improved by surface treatment of coated particles, most of the organic coupling agents used in surface treatment are expensive, which increases the cost; in addition, the additional surface treatment process undoubtedly makes the operation more cumbersome

Method used

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  • Barium titanate and barium ferrite composite powder with nucleus shell structure and preparation method thereof
  • Barium titanate and barium ferrite composite powder with nucleus shell structure and preparation method thereof
  • Barium titanate and barium ferrite composite powder with nucleus shell structure and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] Weigh an appropriate amount of Fe(NO 3 ) 3 ·9H 2 O, Ba(NO 3 ) 2 And urea are dissolved in deionized water so that the molar concentrations of the three are 0.006mol / L, 0.0005mol / L, 0.8mol / L, respectively, weigh 0.5g of barium titanate powder that has been cleaned and degreasing, and add it to 200ml of the above In the reaction solution, 3wt% polyvinylpyrrolidone was added as a dispersant at the same time. After ultrasonic treatment of the above solution for 30 minutes, it was placed in a closed container and reacted under stirring conditions. The reaction temperature was 100°C and the reaction time was 12 hours. After the reaction, the resulting suspension was centrifuged at 6000 rpm to remove After the supernatant, add ultrapure water to redisperse, and then centrifuge, first use deionized water, then use absolute ethanol to repeat the above process three times, and put the coated precursor after cleaning and separation into a vacuum drying oven at 80℃. Drying for 12h; ...

Embodiment 2

[0036] Weigh an appropriate amount of Fe(NO 3 ) 3 ·9H 2 O, Ba(NO 3 ) 2 And urea are dissolved in deionized water so that the molar concentrations of the three are 0.006mol / L, 0.0005mol / L, 0.8mol / L respectively. Weigh 0.1g of barium titanate powder that has been cleaned and degreasing, and add it to 200ml of the above In the reaction solution, 3wt% polyvinylpyrrolidone was added as a dispersant at the same time. After ultrasonic treatment of the above solution for 30 minutes, it was placed in a closed container and reacted under stirring conditions. The reaction temperature was 100°C and the reaction time was 12 hours. After the reaction, the resulting suspension was centrifuged at 6000 rpm to remove After the supernatant, add ultrapure water to redisperse, and then centrifuge, first use deionized water, then use absolute ethanol to repeat the above process three times, and put the coated precursor after cleaning and separation into a vacuum drying oven at 80℃. Drying for 12h; P...

Embodiment 3

[0038] Weigh an appropriate amount of Fe(NO 3 ) 3 ·9H 2 O, Ba(NO 3 ) 2 And urea are dissolved in deionized water so that the molar concentrations of the three are 0.024mol / L, 0.002mol / L, 0.8mol / L respectively. Weigh 0.5g of barium titanate powder that has been cleaned and degreasing, and add it to 200ml of the above In the reaction solution, 3wt% polyvinylpyrrolidone was added as a dispersant at the same time. After ultrasonic treatment of the above solution for 30 minutes, it was placed in a closed container and reacted under stirring conditions. The reaction temperature was 90° C. and the reaction time was 24 hours. After the reaction, the resulting suspension was centrifuged at 6000 rpm to remove After the supernatant, add ultrapure water to redisperse, and then centrifuge, first use deionized water, then use absolute ethanol to repeat the above process three times, and put the coated precursor after cleaning and separation into a vacuum drying oven at 80℃. Dry for 12h; Put ...

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Abstract

The invention discloses barium titanate and barium ferrite composite powder with a nucleus shell structure and a preparation method thereof. The powder is ferroelectric-ferromagnetic multifunctional composite powder with a nucleus shell structure, wherein ferroelectric powder barium titanate serves as a nucleus; a controllable-thickness ferromagnetic shell layer made from barium ferrite is arranged outside the nucleus; and the thickness of a shell layer is adjustable between 10 nanometers and 100 nanometers. The preparation method of the powder is a uniform co-precipitation out-phase coating method. In a co-precipitation process, urea is taken as a precipitant, any surface modification on barium titanate is not required, the nucleus is coated fully by the shell layer, and independent shell layer particles do not exist in a product. The method has the advantages of low cost, easiness and convenience in operating, simple equipment, wide application range and suitability for mass production.

Description

Technical field [0001] The invention relates to a ferroelectric-ferromagnetic multifunctional composite powder material with a core-shell structure and a preparation method thereof, more particularly, a core-shell structure barium titanate-barium ferrite composite powder material and a preparation method thereof The preparation method belongs to the field of novel multifunctional composite powder materials. Background technique [0002] Multifunctional composite powder materials are currently a hot area of ​​research. This type of material integrates a variety of physical and chemical functions such as magnetism, electricity, light, heat, and catalysis. It has great advantages in the miniaturization, intensive function, and environmental protection of equipment and devices. Significance. [0003] Ferroelectric-ferromagnetic multifunctional powder is a kind of powder material with both ferroelectric and ferromagnetic properties. The product effect caused by the coupling between the...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/26C04B35/628
Inventor 于美游盾刘建华李松梅胡竞之
Owner BEIHANG UNIV
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