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Inverse spinel zinc ferrite and preparation method thereof

An anti-spinel, zinc ferrite technology, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problem of large coercive field of Zn ferrite, nanoparticles not suitable for long-term high temperature treatment, unsuitable for Soft magnetic materials and other problems, to achieve the effect of high saturation magnetic susceptibility, excellent properties, simple process steps and equipment

Inactive Publication Date: 2012-07-11
XIAMEN UNIV
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  • Application Information

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Problems solved by technology

In recent years, researchers have realized the exchange of Zn-Fe sites of Zn ferrite by reducing the size of the material to the nanometer level, causing cation rearrangement or surface spin disorder, and the Zn iron prepared in this way Oxygen has a large coercive field, and nanoparticles are not suitable for long-term high-temperature treatment (high-temperature treatment is necessary for the industrial production of soft magnetic materials), so they are not suitable as practical soft magnetic materials.

Method used

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  • Inverse spinel zinc ferrite and preparation method thereof
  • Inverse spinel zinc ferrite and preparation method thereof
  • Inverse spinel zinc ferrite and preparation method thereof

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Embodiment Construction

[0030] The specific steps are given below:

[0031] 1) After mixing zinc sulfate heptahydrate and ferric sulfate in a mortar and mortar with the same amount of substance, add lithium chloride with 100 times the amount of substance of zinc sulfate heptahydrate, and mix the three evenly.

[0032] 2) Put the mixture in step 1) into a high-temperature furnace preheated to 850° C., keep the temperature constant for 1 hour, and take out the product to cool. The process takes place chemical reaction 5Fe 2 (SO 4 ) 3 +2LiCl→2LiFe 5 o 8 +15SO 2 +Cl 2 +7O 2 ;5ZnSO 4 +2LiFe 5 o 8 →5ZnFe 2 o 4 +Li 2 SO 4 +4SO 2 +2O 2 .

[0033] 3) After step 2) is cooled, add deionized water to wash at least once, disperse the solid obtained in step 2) in ethanol, and use a magnet to separate the magnetic product, which is the zinc ferrite powder referred to in the present invention .

[0034] 4) The powder obtained in step 3) is ball-milled with a 400r / min ball mill for 12 hours, and th...

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Abstract

The invention relates to a ferrite soft magnetic material and provides an inverse spinel zinc ferrite with high saturation magnetic susceptibility, resistivity, Curie temperature and resistance, a low coercive field and excellent properties and a preparation method thereof. The inverse spinel zinc ferrite has a chemical formula of ZnFe2O4 and a structural formula of (Zn0.5Fe0.5)[Zn0.5Fe1.5]O4. The preparation method comprises the following steps: mixing zinc sulfate hetahydrate with ferric sulfate and adding lithium chloride so as to obtain a mixture of zinc sulfate hetahydrate, ferric sulfate and lithium chloride; putting the mixture in a high temperature furnace for reaction; cooling and rinsing a resultant; dispersing the resultant in ethanol and separating magnetic products with a magnet so as to obtain zinc ferrite powder; and carrying out compression molding on the zinc ferrite powder with a binder after ball milling so as to obtain the inverse spinel zinc ferrite.

Description

technical field [0001] The invention relates to a ferrite soft magnetic material, in particular to an inverse spinel zinc ferrite and a preparation method thereof. Background technique [0002] Soft magnetic material is an extremely important industrial material. An excellent soft magnetic material should have high saturation magnetization, high Curie temperature and low coercive field. With the development of information technology, higher requirements are put forward for the properties of soft magnetic materials, and good high-frequency characteristics, high resistivity and low loss are also required. Commonly used soft magnetic materials are mainly MnZn ferrite and NiZn ferrite. Since pure Zn ferrite is antiferromagnetic at room temperature, there has been no report on using pure Zn ferrite as a soft magnetic material. [0003] Zinc ferrite is a commonly used engineering technology material, widely used in catalysts, magnetic material additives, desulfurizers and anti-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
Inventor 谢兆雄吴江涛徐韬
Owner XIAMEN UNIV
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