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Nanocrystal M-shaped ferrite powder and synthesis method thereof

A synthesis method and ferrite technology, applied in the field of new materials of nanocrystalline magnetic materials, can solve the problems of high production energy consumption, long preparation period, coarse product crystal grains, etc., and achieve high production efficiency, shorten calcination time, energy low consumption effect

Inactive Publication Date: 2013-10-09
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to propose a method for synthesizing nanocrystalline M-type ferrite powder in order to solve the above-mentioned technical problems such as long preparation period, high production energy consumption, and coarse product crystal grains.

Method used

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Embodiment 1

[0029] A nanocrystalline M-type ferrite powder is a single M-type ferrite powder with a particle size of about 100nm. The M, iron and oxygen contained in it are calculated by molar ratio, that is, M:Fe: O is 1:12:19;

[0030] The M is Pb.

[0031] The synthetic method of above-mentioned a kind of nanocrystalline M-type ferrite powder specifically comprises the following steps:

[0032] (1) Calculate the molar concentration of 0.2mol citric acid and 1300ml distilled water, that is, the molar concentration of citric acid in distilled water is 0.154mol / l, dissolve citric acid in distilled water, then add 0.12mol Fe salt and 0.01 mol of M metal salt, fully stirred and dissolved until clarified, adjusted the pH value of the solution to 7.0 with ammonia water, and obtained solution A;

[0033] The amount of Fe salt and M metal salt added is calculated by the molar ratio of citric acid to the total metal ions of Fe salt and M metal salt, i.e. citric acid: the total metal ion of Fe ...

Embodiment 2

[0041] A nanocrystalline M-type ferrite powder is a single M-type ferrite powder with a particle size of about 85nm. The M, iron and oxygen contained in it are calculated by molar ratio, that is, M:Fe: O is 1:12:19;

[0042] Said M is Sr.

[0043] The synthetic method of above-mentioned a kind of nanocrystalline M-type ferrite powder specifically comprises the following steps:

[0044] (1) Calculate the molar concentration of 0.36mol citric acid and 2500ml distilled water, that is, the molar concentration of citric acid in distilled water is 0.144mol / l, dissolve citric acid in distilled water, then add 0.12mol Fe salt and 0.02 mol of M metal salt, fully stirred and dissolved until clarified, adjusted the pH value of the solution to 6.2 with ammonia water, and obtained solution A;

[0045] The amount of Fe salt and M metal salt added is calculated by the molar ratio of citric acid to the total metal ions of Fe salt and M metal salt, i.e. citric acid: the total metal ion of Fe...

Embodiment 3

[0052] A nanocrystalline M-type ferrite powder is a single M-type ferrite powder with a particle size of about 65nm. The M, iron and oxygen contained in it are calculated by molar ratio, that is, M:Fe: O is 1:12:19;

[0053] Said M is Ba.

[0054] The synthetic method of above-mentioned a kind of nanocrystalline M-type ferrite powder specifically comprises the following steps:

[0055] (1) Calculate the molar concentration of 0.4mol citric acid and 2700ml distilled water, that is, the molar concentration of citric acid in distilled water is 0.148mol / l, dissolve citric acid in distilled water, then add 0.12mol Fe salt and 0.02 mol of M metal salt, fully stirred and dissolved until clarified, adjusted the pH value of the solution to preferably 6.5 with ammonia water, and obtained solution A;

[0056] The amount of Fe salt and M metal salt added is calculated by the molar ratio of citric acid to the total metal ions of Fe salt and M metal salt, i.e. citric acid: the total metal...

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Abstract

The invention discloses a nanocrystal M-shaped ferrite powder and a synthesis method thereof. The nanocrystal M-shaped ferrite powder is a single M-shaped ferrite powder with the particle size of 65-100nm; in the contained nanocrystal M-shaped ferrite powder, M:Fe:O=1:12:19 and M is Pb, Ba or Sr. The synthesis method of the nanocrystal M-shaped ferrite powder comprises the following steps of: firstly, dissolving citric acid into distilled water; then, adding Fe salt and M metal salt, and sufficiently stirring the mixture until the mixture is dissolved, and adjusting the pH value of the solution to 5-7.5 by using ammonium hydroxide; next, stirring the solution at the temperature of 75-100 DEG C to form a complex solution, and then, controlling the temperature at 60-120 DEG C to form a precursor; and finally, calcining the precursor at the temperature of 850-900 DEG C for 60-120min to obtain the nanocrystal M-shaped ferrite powder. The synthesis method has the characteristics of short synthesis period, high efficiency, low synthesis cost, suitability for mass production and the like; and the synthesized powder nanoparticles are fine and uniform.

Description

technical field [0001] The invention relates to a nanocrystalline M-type ferrite powder and a synthesis method thereof. The invention belongs to the field of new materials of nanocrystalline magnetic materials. Background technique [0002] M-type ferrite has the advantages of high coercive force and magnetic energy product, uniaxial magnetocrystalline anisotropy, etc., and is widely used as permanent magnet materials, microwave absorbing materials and high-density perpendicular magnetic recording media, etc. It is an important basic functional material, which is widely used in permanent magnet motors, permanent magnet separators, loudspeakers, magnetic thrust bearings, magnetic separators and microwave devices. [0003] Ultrafine M-type ferrite magnetic powder shows high specific saturation magnetization, high coercive force and excellent chemical stability due to relatively high magnetocrystalline anisotropy, and has a wide range of applications in permanent magnets and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 王为主周志鹏王占勇金鸣林钱蕙春郑玉丽徐家跃
Owner SHANGHAI INST OF TECH
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