Ferrite wave-absorbing material with perovskite structure and preparation method of ferrite wave-absorbing material

A technology of perovskite structure and wave absorbing material, applied in the field of wave absorbing material, can solve the problems of performance degradation, interference with normal operation, failure, etc., to achieve less energy required, high product uniformity and purity, and low reflection loss rate Effect

Inactive Publication Date: 2021-07-27
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, the electromagnetic waves radiated by electronic instruments and equipment will interfere with the normal operation of surrounding electronic instruments, resulting in their performance degradation or even failure.

Method used

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  • Ferrite wave-absorbing material with perovskite structure and preparation method of ferrite wave-absorbing material
  • Ferrite wave-absorbing material with perovskite structure and preparation method of ferrite wave-absorbing material
  • Ferrite wave-absorbing material with perovskite structure and preparation method of ferrite wave-absorbing material

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Experimental program
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preparation example Construction

[0042] like figure 1 Shown, the preparation method of the ferrite wave-absorbing material of perovskite structure comprises the following specific steps:

[0043] (1). The analytically pure neodymium nitrate hexahydrate (Nd(NO 3 ) 3 ·6H 2 O), ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) and nickel nitrate hexahydrate (Ni(NO 3 ) 3 ·6H 2 O) as the ion source of Nd, Fe, Ni, weigh the sample according to the stoichiometric ratio of the experimental components, and utilize ultrasonic dispersion, and dissolve the weighed sample into a certain volume of deionized water to obtain a solution.

[0044] (2) Add citric acid monohydrate with a molar ratio of 1:1 to 2:1 to the metal ion in the solution, and adjust the weakly alkaline water environment with a pH of 7.3 to 9.0 by dripping ammonia water.

[0045] (3) Put the prepared solution in a 60-90°C water bath, add a clean and non-polluting magnetic rotor to the solution and stir it with a magnetic stirrer for 2.5-4 hours unt...

Embodiment 1

[0051] 1) Analyzing pure grade neodymium hexahexammonium nitrate (Nd(NO 3 ) 3 ·6H 2 O), ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) as the ion source of Nd and Fe, the 1:1 stoichiometric ratio takes the sample, and utilizes ultrasonic dispersion to dissolve the weighed sample into a certain volume of deionized water to obtain a solution;

[0052] 2) Add citric acid monohydrate with a molar ratio of 1:2 to the metal ion in the solution, and adjust the pH to 7.5 by dripping ammonia water;

[0053] 3) Put the prepared solution in a 60°C water bath, and stir it with a magnetic stirrer for 5 hours until the solution is uniform and becomes a transparent gel;

[0054] 4) placing the wet gel in a drying oven at 90°C for 36 hours to obtain a dry gel;

[0055] 5) Put the obtained xerogel into a crucible, put it in a resistance furnace and pre-fire it at 200°C for 2 hours, remove the organic matter and obtain the precursor powder;

[0056] 6) The prepared precursor powder is g...

Embodiment 2

[0065] 1) Analytical grade neodymium nitrate hexahydrate (Nd(NO 3 ) 3 ·6H 2 O), ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) and hexahydrate and nickel nitrate (Ni(NO 3 ) 3 ·6H 2 O) As the ion source of Nd, Fe, Ni, take NdFe by the stoichiometric ratio of 9:1 0.9 Ni 0.1 o 3 The sample is dispersed by ultrasonic waves, and the weighed sample is dissolved in a certain volume of deionized water to obtain a solution;

[0066] 2) Add citric acid monohydrate with a molar ratio of 1:1.25 to the metal ion in the solution, and adjust the pH to 8 by dripping ammonia water;

[0067] 3) Put the prepared solution in a 70°C water bath, and stir it with a magnetic stirrer for 4 hours until the solution is uniform and becomes a transparent gel;

[0068] 4) Drying the wet gel in a drying oven at 100°C for 32 hours to obtain a dry gel;

[0069] 5) Put the obtained xerogel into a crucible, put it in a resistance furnace and pre-fire it at 250°C for 2 hours, remove the organic matt...

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Abstract

The invention provides a ferrite wave-absorbing material with a perovskite structure and a preparation method of the ferrite wave-absorbing material. The molecular formula of the ferrite wave-absorbing material with the perovskite structure is NdFe<1-x>Ni<x>O<3> (wherein x is equal to 0, 0.1, 0.2 or 0.3). The preparation method comprises the following steps: with neodymium nitrate hexahydrate, iron nitrate nonahydrate and nickel nitrate hexahydrate as raw materials, dissolving the raw materials in deionized water according to a stoichiometric ratio, adding a proper amount of citric acid monohydrate, dropwise adding ammonia water to adjust a pH value to achieve an alkaline environment, and then conducting heating and stirring in a water bath kettle to obtain uniform wet gel; and drying the prepared wet gel in an air dry oven, conducting pre-sintering to obtain a precursor, adding PVA into obtained precursor powder, conducting granulating, performing uniformly grinding, and and carrying out mould pressing to prepare a cylindrical block. The ferrite wave-absorbing material with the perovskite structure has a very good microwave absorbing effect in a microwave band of 2-18 GHz, is wide in absorbing frequency band, and has the advantages that the preparation process is simple, the preparation process is easy to regulate and control and the like.

Description

technical field [0001] The invention belongs to the field of wave-absorbing materials, in particular to a ferrite wave-absorbing material with a perovskite structure and a preparation method. Background technique [0002] In the modern life dominated by electronic information, people's life and work have become more convenient and efficient due to the use of more and more electronic products. Microwave is also used as an information carrier in all aspects of life. For example, high-frequency electromagnetic waves are more and more widely used in high-tech aspects such as communication systems, intelligent transportation systems, electronic toll collection systems, medical systems, and local area network systems. The use of a large number of new digital, informational, and intelligent electronic devices has made the space electromagnetic environment more and more complex, and the electromagnetic energy density is also increasing, and the electromagnetic pollution problem tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40C04B35/622C04B35/624
CPCC04B35/2675C04B35/2608C04B35/622C04B35/624C04B2235/768C04B2235/3279C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/96
Inventor 姚青荣梁琪华童兆飞成丽春卢照王江
Owner GUILIN UNIV OF ELECTRONIC TECH
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