Nickel zinc ferrite material and its preparation method

A technology of nickel-zinc ferrite and nickel nitrate, which is applied in the field of nickel-zinc ferrite materials and its preparation, can solve the problems of high energy consumption and achieve the effects of low energy consumption, short synthesis time, and uniform particle size distribution

Inactive Publication Date: 2007-05-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] With ferric citrate, zinc nitrate, nickel nitrate and citric acid as the raw material to prepare ferrite research seldom, only Verma.A (A.Verma, T.C.Goel, et al., Journal of Magnetism and MagneticMaterials (208 ) (2000), P13-19) used the above raw materials to prepare ferrite materials. Firstly, citrate precursor was used to make xerogel, and then calcined at a high temperature of 1000°C to obtain ferrite powder precursor. NiZn ferrite is obtained by pressing and sintering. This method requires high-temperature calcination of ferrite powder, which consumes a lot of energy.

Method used

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  • Nickel zinc ferrite material and its preparation method
  • Nickel zinc ferrite material and its preparation method
  • Nickel zinc ferrite material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0020] Press Ni 0.5 Zn 0.5 Fe 2 o 4 The stoichiometric ratio takes analytically pure ferric citrate, zinc nitrate and nickel nitrate, dissolves ferric citrate, nickel nitrate and zinc nitrate in deionized water respectively, and adds analytically pure citric acid after mixing, the molar ratio of citric acid to ferric citrate Respectively 2:1, 2.5:1, 3:1, stir evenly to obtain a clear precursor solution; heat the precursor solution to evaporate the solvent to form a black-red foamy substance, which is self-combusting, and the foamy substance expands to obtain Loose brown powder; press the brown powder into a disc with a diameter of 1.8 cm and a thickness of 1.5 mm under a pressure of 5 MPa, and sinter at 1300 ° C for 2 hours.

[0021] The relative density test results of the samples are shown in Figure 1. It can be seen from the figure that when the molar ratio of citric acid to ferric citrate is 3:1, the density of the sample is 4.75, and when the molar ratio of citric aci...

Embodiment 2

[0023] Press Ni 0.5 Zn 0.5 Fe 2 o 4 The stoichiometric ratio takes analytically pure ferric citrate, zinc nitrate and nickel nitrate, dissolves ferric citrate, nickel nitrate and zinc nitrate in deionized water respectively, and adds analytically pure citric acid after mixing, the molar ratio of citric acid to ferric citrate Respectively 2:1, 2.5:1, 3:1, stir evenly to obtain a clear precursor solution; heat the precursor solution to evaporate the solvent to form a black-red foamy substance, which is self-combusting, and the foamy substance expands to obtain Loose brown powder; press the brown powder into a disc with a diameter of 1.8 cm and a thickness of 1.5 mm under a pressure of 7 MPa, and sinter at 700 ° C for 3 hours. The phase structure was analyzed by X-ray diffraction (XRD), and the test results are shown in Figure 2. It can be seen from Figure 2 that the structures of the samples obtained with different amounts of citric acid are all single spinel structures.

Embodiment 3

[0025] Press Ni 0.5 Zn 0.5 Fe 2 o 4 The stoichiometric ratio takes analytically pure ferric citrate, zinc nitrate and nickel nitrate, dissolves ferric citrate, nickel nitrate and zinc nitrate in deionized water respectively, and adds analytically pure citric acid after mixing, the molar ratio of citric acid to ferric citrate Respectively 2:1, 2.5:1, 3:1, stir evenly to obtain a clear precursor solution; heat the precursor solution to evaporate the solvent to form a black-red foamy substance, which is self-combusting, and the foamy substance expands to obtain Loose brown powder; press the brown powder into a disc with a diameter of 1.8 cm and a thickness of 1.5 mm under a pressure of 10 MPa, and sinter at 1100 ° C for 5 hours. The sintered surface of the sample was studied with a field emission scanning electron microscope, and the test results are shown in Figure 3 (a), (b), (c). Figure (a) is the SEM figure of the molar ratio of citric acid and ferric citrate being 2:1 re...

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Abstract

The invention discloses a Ni-Zn-Fe oxide material with expressive formula as Ni0.5Zn0.5Fe2O4, which comprises the following steps: weighing pure ferric citrate, zinc nitrate and nickel nitrate; dissolving zinc nitrate and nickel nitrate into deionized water; blending to add ferric citrate; stirring evenly to obtain clear former solution; heating the former solution; evaporating solvent to form black red foaming material; producing self-combustion; bulking the foaming material to obtain the loose brown powder; compressing the brown powder; sintering to obtain the product.

Description

technical field [0001] The invention relates to a nickel-zinc ferrite material and a preparation method thereof. Background technique [0002] Soft magnetic material NiZn ferrite, its performance is very stable, the price is relatively low, the preparation process is relatively easy, and because of its high resistivity, low eddy current loss, and good magnetic properties, this ferrite is widely used in Microwave devices, high-energy converters in the electronics industry, high-quality filters, antenna masts, audio coils, input and output ports of high-speed digital bands, and other communication fields. In the application of NiZn ferrite in the actual high-frequency range, it is necessary to obtain high resistivity, because generally the higher the resistivity, the larger the high-frequency range of its application. [0003] DC resistivity, dielectric constant, and dielectric loss are important properties of NiZn ferrite, which depend on the preparation conditions, chemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G1/02C04B35/26C04B35/626
Inventor 杜丕一陈倩黄文艳翁文剑韩高荣赵高凌汪建勋宋晨路沈鸽徐刚张溪文
Owner ZHEJIANG UNIV
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