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Method for preparing high-purity X-shaped hexagonal strontium cobalt ferrite material

A high-purity, strontium-cobalt-iron technology, which is applied in the field of preparation of new magnetoelectric materials, can solve the problems of complex and difficult-to-control preparation process, long synthesis cycle, and high reaction temperature, and achieve simple and easy-to-control process, short production cycle and high phase purity Effect

Active Publication Date: 2017-09-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Sr 2 Zn 2 Fe 28 o 46 Ferrite, precipitating agent is NaOH / Na 2 CO 3 , calcined at 1400°C for 6–70 hours, in this method Na + It is difficult to completely remove during washing, which has a great impact on the final performance of the product, and the reaction temperature is too high, the preparation process is complicated and difficult to control, the synthesis cycle is long, and it is difficult to industrialize production

Method used

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  • Method for preparing high-purity X-shaped hexagonal strontium cobalt ferrite material
  • Method for preparing high-purity X-shaped hexagonal strontium cobalt ferrite material
  • Method for preparing high-purity X-shaped hexagonal strontium cobalt ferrite material

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Effect test

Embodiment 1

[0033] A high-purity X-type hexagonal strontium cobalt ferrite material (Sr 2 co 2 Fe 28 o 46 ) preparation method, comprising the steps of:

[0034] S1.1 Weigh a certain amount of strontium nitrate, cobalt nitrate hexahydrate and ferric nitrate nonahydrate respectively, heat in air at 300°C for 8 hours, and ball mill to obtain strontium-containing powder, cobalt-containing powder and iron-containing powder, and calibrate their strontium respectively content, cobalt content and iron content;

[0035] S1.2 Weigh the calibrated strontium-containing powder, cobalt-containing powder and iron-containing powder according to the molar ratio of Sr:Co:Fe=2:2:28, mix them by ball milling, dry them in vacuum, and place them in a high-temperature tube atmosphere furnace. Calcined in oxygen at 1150°C for 8 hours, and the oxygen flow rate was 0.5L / min to obtain the precursor powder, and its phase composition was tested by X-ray diffraction ( figure 1 ). The heating rate is 5°C / min whe...

Embodiment 2

[0041] The proportion of the precursor powder, the calcination process and the molding process of the green body in Example 2 are the same as those in Example 1, but the sintering atmosphere in S1.4 is different, and this example is air.

[0042] S1.4 Place the green body in a high-temperature tubular atmosphere furnace and sinter in air at 1200° C. for 16 hours with an air flow rate of 0.5 L / min to obtain a ceramic sample. When the temperature rises to ≤1000°C, the heating rate is 5°C / min, when the temperature rises to >1000°C, the heating rate is 3°C / min, and the cooling rate is 5°C / min.

[0043] X-type hexagonal strontium cobalt ferrite (Sr 2 co 2 Fe 28 o 46 ) has a purity of 92.7%.

Embodiment 3

[0045] The proportion of precursor powder, the calcination process and the molding process of green body in Example 3 are the same as those in Example 1, but the sintering temperature and holding time in S1.4 are different.

[0046] S1.4 Place the green body in a high-temperature tubular atmosphere furnace and sinter it in oxygen at 1250°C for 8 hours with an oxygen flow rate of 0.5 L / min to obtain a ceramic sample. When the temperature rises to ≤1000°C, the heating rate is 5°C / min, when the temperature rises to >1000°C, the heating rate is 3°C / min, and the cooling rate is 5°C / min.

[0047] image 3 It is the X-ray diffraction (XRD) spectrogram of the prepared ceramics of embodiment three, and the result shows: X type hexagonal strontium cobalt ferrite (Sr 2 co 2 Fe 28 o 46 ) has a purity of 86.8%.

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Abstract

The invention belongs to the technical field of preparation of novel magnetoelectric materials and relates to a method for preparing a high-purity X-shaped hexagonal strontium cobalt ferrite material. The method comprises the following steps: 1) precursor powder and preparation thereof: taking a decomposition product of a strontium cobalt ferric salt as a precursor powder raw material, weighing the raw material according to a certain molar ratio, performing ball-milling, mixing, drying to obtain the precursor powder under a specific calcining process, and performing ball-milling; 2) preparation of a high-purity X-shaped hexagonal strontium cobalt ferrite ceramic (Sr2Co2Fe28O46), namely weighing a proper amount of precursor powder, and performing mould pressing to form a green body under a molding process, thereby obtaining the high-purity X-shaped hexagonal strontium cobalt ferrite ceramic in the sintering process. The material prepared in the invention is high in phase purity, simple and easily controllable in process, short in production period and moderate in cost, thereby being suitable for volume production and having wide application prospects.

Description

technical field [0001] The invention relates to a high-purity X-type hexagonal strontium cobalt ferrite material Sr 2 co 2 Fe 28 o 46 The preparation method belongs to the technical field of preparation of novel magnetoelectric materials. Background technique [0002] The magnetoplumbite type hexagonal ferrite mainly includes six categories: MFe 12 o 19 (M type), A 2 m 2 Fe 12 o 22 (Y type), AM 2 Fe 16 o 27 (W type), A 3 m 2 Fe 24 o 41 (Z type), A 4 m 2 Fe 36 o 60 (U type) and A 2 m 2 Fe 28 o 46 (Type X), where A is Ba 2+ or Sr 2+ Alkaline earth metal ions (from which the ferrite is divided into Ba series and Sr series), M is Fe 2+ 、Co 2+ 、Ni 2+ 、Cu 2+ , Zn 2+ and other transition metal ions or their joint combinations. The structure of these ferrites can be described as R, S, T, R * , S * , T * , R’, S’ and T’, a total of nine kinds of plate stacking, where R, S and T are independent plates, and R plate is AFe 6 o 11 Three-story structura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
CPCC04B35/2633C04B35/622C04B2235/3213C04B2235/3275C04B2235/6583
Inventor 邵刚勤张安乐谢贵震朱璨顾佳妮晏佳礼马霏霏范书豪毛家威
Owner WUHAN UNIV OF TECH