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

A technology for structuring barium titanate and barium ferrite, which is applied in the fields of ferroelectric-ferromagnetic multifunctional composite powder materials and their preparation, core-shell structure barium titanate-barium ferrite composite powder materials and their preparation fields It can solve the problems of complicated operation, limited product purity, and difficult to control the supersaturation of the solution, and achieve the effect of simple preparation method and strong magnetoelectric coupling coefficient.

Inactive Publication Date: 2013-01-02
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 Dissolve urea and urea in deionized water so that the molar concentrations of the three are 0.006mol / L, 0.0005mol / L, and 0.8mol / L respectively, weigh 0.5g of barium titanate powder that has been cleaned and degreased, and add it to 200ml of the above-mentioned In the reaction solution, 3wt% polyvinylpyrrolidone was added simultaneously as a dispersant. After the above solution was ultrasonically treated for 30 minutes, it was placed in an airtight container and reacted under stirring conditions. The reaction temperature was 100°C and the reaction time was 12 hours; Add ultrapure water to the supernatant to redisperse, then centrifuge, repeat the above process three times with deionized water first, and then with absolute ethanol, and put the coated precursor after cleaning and separation into a vacuum drying oven at 80°C Drying for 12 hours at 100°C; put the dried coating precursor into a muffle furnace...

Embodiment 2

[0036] Weigh an appropriate amount of Fe(NO 3 ) 3 9H 2 O, Ba(NO 3 ) 2 Dissolve urea and urea in deionized water so that the molar concentrations of the three are 0.006mol / L, 0.0005mol / L, and 0.8mol / L respectively. Weigh 0.1g of barium titanate powder that has been cleaned and degreased, and add it to 200ml of the above-mentioned In the reaction solution, 3wt% polyvinylpyrrolidone was added simultaneously as a dispersant. After the above solution was ultrasonically treated for 30 minutes, it was placed in an airtight container and reacted under stirring conditions. The reaction temperature was 100°C and the reaction time was 12 hours; Add ultrapure water to the supernatant to redisperse, then centrifuge, repeat the above process three times with deionized water first, and then with absolute ethanol, and put the coated precursor after cleaning and separation into a vacuum drying oven at 80°C Drying for 12 hours at 100°C; put the dried coating precursor into a muffle furnace...

Embodiment 3

[0038] Weigh an appropriate amount of Fe(NO 3 ) 3 9H 2 O, Ba(NO 3 ) 2 Dissolve urea and urea in deionized water so that the molar concentrations of the three are 0.024mol / L, 0.002mol / L, and 0.8mol / L respectively, weigh 0.5g of barium titanate powder that has been cleaned and degreased, and add it to 200ml of the above-mentioned In the reaction solution, 3wt% polyvinylpyrrolidone was added simultaneously as a dispersant. After the above solution was ultrasonically treated for 30 minutes, it was placed in an airtight container and reacted under stirring conditions. The reaction temperature was 90°C and the reaction time was 24 hours; Add ultrapure water to the supernatant to redisperse, then centrifuge, repeat the above process three times with deionized water first, and then with absolute ethanol, and put the coated precursor after cleaning and separation into a vacuum drying oven at 80°C Dry at 800°C for 12 hours; put the dried coating precursor into a muffle furnace, and...

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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 barium titanate-barium ferrite composite powder material with a core-shell structure and its The preparation method belongs to the field of novel multifunctional composite powder materials. Background technique [0002] Multifunctional composite powder materials are currently a hot research field. This kind of materials integrates various physical and chemical functions such as magnetism, electricity, light, heat, and catalysis. 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 ferroelectric and ferromagnetic phases makes it widely used in microwave, High-voltage transmission line measurement, wide-band detection, magne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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