A high-dielectric and high-magnetic nickel-doped barium ferrite ceramic material and its preparation method

A technology of barium ferrite and ceramic materials, which is applied in the field of nickel-doped single-phase barium ferrite ceramic materials, can solve the problems of decrease in saturation magnetization, insignificant increase in saturation magnetization, and large loss, and achieve simple preparation methods, Excellent high-dielectric and high-magnetic properties, the effect of increasing magnetization

Active Publication Date: 2020-01-14
ZHEJIANG UNIV
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  • Abstract
  • Description
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Problems solved by technology

However, complex multiferroic materials also have obvious disadvantages: firstly, when heterogeneous materials are in contact with each other, there are more defects, so the loss becomes larger; secondly, according to the law of recombination, when ferroelectric and ferromagnetic materials are recombined, There will be a certain degree of decline in performance compared with single-phase
However, since the substituent ions in this high-dielectric and high-magnetic single-phase material that can be successfully prepared at present are all high-valent ions, but they are not magnetic, this substitution can only make the magnetic properties of this ferrite reach its own spin. Up Fe 3+ A certain highest value that ions can contribute to the magnetic properties, and the increase in saturation magnetization is not obvious from the experimental results reported so far

Method used

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  • A high-dielectric and high-magnetic nickel-doped barium ferrite ceramic material and its preparation method
  • A high-dielectric and high-magnetic nickel-doped barium ferrite ceramic material and its preparation method
  • A high-dielectric and high-magnetic nickel-doped barium ferrite ceramic material and its preparation method

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Experimental program
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example 1

[0027] (1) According to the molar ratio of 1:11.2:0.8, mix 2.613g of barium nitrate, 45.248g of iron nitrate nonahydrate and 2.362g of nickel nitrate hexahydrate. Then add 39.086g of citric acid monohydrate as complexing agent. After adding 300 mL of deionized water, stir for 2 hours until the solute is completely dissolved to obtain the desired solution;

[0028] (2) Add ammonia water to the above solution, adjust the pH value to 7, heat and stir in a water bath at 85° C. for 4 hours, and volatilize the solvent to obtain a sol precursor;

[0029] (3) drying the obtained sol precursor at 100-120°C for 3-4 days to obtain a fluffy xerogel;

[0030] (4) Heat the dry gel at a rate of 5 °C / min to 210 °C for 1.5 hours, then continue to increase the temperature at a rate of 5 °C / min to 450 °C for 2 hours, and finally increase the temperature at a rate of 10 °C / min After holding at 800°C for 3 hours, and then cooling in the furnace, the precursor of nickel-doped barium ferrite powde...

example 2

[0034] (1) According to the molar ratio of 1:11.4:0.6, mix 2.613g of barium nitrate, 46.056g of iron nitrate nonahydrate and 1.745g of nickel nitrate hexahydrate. Then add 39.296g of citric acid monohydrate as complexing agent. After adding 320 mL of deionized water, stir for 1.5 h until the solute is completely dissolved to obtain the desired solution;

[0035] (2) Add ammonia water to the above solution, adjust the pH value to 7, heat and stir in a water bath at 88° C. for 3 hours, and volatilize the solvent to obtain a sol precursor;

[0036] (3) drying the obtained sol precursor at 118° C. for 4 days to obtain a fluffy xerogel;

[0037] (4) Heat the dry gel at a rate of 8 °C / min to 210 °C for 1.5 hours, then continue to increase the temperature at a rate of 5 °C / min to 450 °C for 2 hours, and finally increase the temperature at a rate of 10 °C / min After reaching 800°C, keep it warm for 3 hours, and then cool down with the furnace to obtain the nickel-doped barium ferrite...

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Abstract

The invention discloses a high-dielectric high magnetic nickel-doped barium ferrite ceramic material. The chemical formula of the barium ferrite ceramic material is BaFe12-xNixO19, wherein x=0.6-0.8. Nickel-doped barium ferrite ceramics are single-phase materials, and Ni2+ replaces part of Fe3+ in BaFe12O19 unit cells to obtain the doped barium ferrite ceramics. A preparation method of the barium ferrite ceramic material includes the steps: preparing a ceramic precursor by a citrate sol-gel method; pre-sintering the ceramic precursor to obtain powder; performing grinding, forming and high-temperature sintering to finally form the barium ferrite ceramic material. The barium ferrite ceramic material is simple in technological process, high in controllability and low in cost, high-dielectric high magnetic single-phase barium ferrite ceramic materials can be simultaneously obtained, and the barium ferrite ceramic material is of great significance for further promoting development of the barium ferrite ceramics in the field of ferroelectric-ferromagnetic coexistence multifunction.

Description

technical field [0001] The invention belongs to multiferroic single-phase ceramics, and relates to a nickel-doped single-phase barium ferrite ceramic material with coexistence of high dielectric and high magnetic properties. Background technique [0002] With the rapid development of society, electronic devices are becoming more and more miniaturized and multi-functional. How to integrate more performance in a relatively small space is the key to breaking through the limitations of manufacturing technology in large-scale integrated circuits in the future. where. In recent years, researchers have tried to develop electronic devices with smaller volume, more comprehensive functions and better performance from the material itself, which is of great significance for the application and development of information materials in the future. [0003] Multiferroic materials, which are representative of multifunctional materials, have attracted extensive attention because they have tw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/34C04B35/26C04B35/624
CPCC04B35/2633C04B35/624C04B2235/3215C04B2235/3272C04B2235/3279C04B2235/658C04B2235/96
Inventor 杜丕一徐乾坤王敏王宗荣马宁
Owner ZHEJIANG UNIV
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