Method for preparing barium ferrite with low coercive force temperature coefficient

A technology of barium ferrite and temperature coefficient, applied in the field of preparation of barium ferrite with low temperature coefficient of coercivity, can solve the problems of large temperature coefficient of coercivity, large temperature change of coercivity, etc. Chance of reunion, good crystal phase, energy saving effect

Inactive Publication Date: 2010-05-19
SHENYANG NORMAL UNIV
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Problems solved by technology

[0005] In order to solve the problem that the existing barium ferrite materials have too large coercive force temperature coefficient in application, that is, the problem that the coercive force changes greatly with temperature, a preparation method of barium ferrite with low coercive force temperature coefficient is provided. , the method utilizes Co 2+ , Zn 2+ , Sn 4+ or Co 2+ , Mn 2+ , Sn 4+ Ternary joint substitution Fe 3+ To adjust the temperature coefficient of coercive force

Method used

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  • Method for preparing barium ferrite with low coercive force temperature coefficient
  • Method for preparing barium ferrite with low coercive force temperature coefficient
  • Method for preparing barium ferrite with low coercive force temperature coefficient

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Embodiment 1

[0017] see Figure 1-Figure 2 , by BaFe 12-2x co x / 2 Zn x / 2 sn x o 19 Molecular formula weighs 1×10 -2 mol BaCl 2 2H 2 O, 9.17×10 -2 mol FeCl 3 ·6H 2 O, 4.58×10 -3 mol ZnCl 2 , 4.58×10 -3 mol CoCl 2 ·6H 2 O, 9.17×10 -3 mol SnCl 2 2H 2 O was dissolved in distilled water with stirring in a 70°C water bath to form a mixed solution. Take another 2.83×10 -1 mol of anhydrous sodium carbonate was dissolved in an appropriate amount of distilled water and stirred in a water bath at 70°C. Quickly pour the above mixed solution into the continuously stirring sodium carbonate solution, continue to stir for 1 hour, cool and age, filter with suction, and wash with water until there is no Cl - , dried at 80°C. Weigh 2 g of the precipitate, grind and mix with potassium chloride solid in a ratio of 1:1 by weight, heat up to 450°C for 2 hours at a heating rate of 15°C / min, and heat up to 950°C for 4 hours; The heat-treated product is then washed with water to be free of Cl ...

Embodiment 2

[0019] see Figure 4-Figure 5 , by BaFe 12-2x co x / 2 mn x / 2 sn x o 19 Molecular formula weighs 1×10 -2 mol BaCl 2 2H 2 O, 1.06×10 -1 mol FeCl 3 ·6H 2 O, 9.14×10 -4 mol ZnCl 2 , 9.14×10 -4 mol CoCl 2 ·6H 2 O, 1.83×10 -3 mol SnCl 2 2H 2 O was dissolved in distilled water with stirring in a 70°C water bath to form a mixed solution. Take another 2.83×10 -1 mol of anhydrous sodium carbonate was dissolved in an appropriate amount of distilled water and stirred in a water bath at 70°C. Quickly pour the above mixed solution into the continuously stirring sodium carbonate solution, continue to stir for 1 hour, cool and age, filter with suction, and wash with water until there is no Cl - , dried at 80°C. Weigh 2g of the precipitate, grind and mix it with potassium chloride solid at a weight ratio of 1:1, and conduct heat treatment at a heating rate of 15°C / min at (450°C, 2h)+(950°C, 4h). The heat-treated product is then washed with water to be free of Cl - , dried...

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Abstract

The invention provides a method for preparing barium ferrite with a low coercive force temperature coefficient. To solve the contradiction existing in the application of the traditional barium ferrite material that the coercive force temperature coefficient is too big, namely the coercive force is of drastic variation with temperature, the invention utilizes the coprecipitation-molten-salt growth method and substitutes the ternary combination of Co2+, Zn2+ and Sn4+ or Co2+, Mn2+ and Sn4+ for Fe3+ to adjust the coercive force temperature coefficient and the coercive force. In the method, just by adjusting the mixing amount, the coercive force temperature coefficient of the barium ferrite can be effectively lowered, and the application potential of the barium ferrite can be widened; simultaneously, due to the adoption of the coprecipitation-molten-salt growth method in which molten potassium chloride is used as a solvent, the reaction temperature is lowered, the reaction time is shortened, the probability of hard agglomeration of products is reduced, and the Co2+, Zn2+ and Sn4+ or Co2+, Mn2+ and Sn4+ ternary combination substituted single phase barium ferrite is obtained; the obtained product is high in purity and good in crystalline phase; and the process is simple, steps are few, the operation is convenient, the energy is saved, and the industrialized production is realized, so that the method of the invention is a good method for preparing the barium ferrite with the low coercive force temperature coefficient.

Description

Technical field: [0001] The invention relates to a preparation method in the technical field of magnetic materials, in particular to a preparation method of barium ferrite with a low temperature coefficient of coercive force. Background technique [0002] Barium ferrite is a hard ferrite with a hexagonal magnetoplumbite structure and belongs to P6 3 / mmc space group. Due to its high saturation magnetization, high coercive force, high magnetocrystalline anisotropy and chemical stability, barium ferrite and its doped barium ferrite can be used as chips and microwave materials. As permanent magnetic materials and magnetic recording materials, barium ferrite and its doped barium ferrite have aroused extensive scientific and technical research interests. [0003] Advanced barium ferrite and its doped barium ferrite materials provide a high signal-to-noise ratio and support high-density storage of information. Because the information retention time is related to the remanence, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/26
Inventor 刘颖刘跃
Owner SHENYANG NORMAL UNIV
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