Lithium-zinc ferrite electromagnetic wave absorption material and preparation method thereof

A technology of absorbing materials and ferrites, which is applied in the field of micron-scale lithium-zinc ferrite materials and their preparation, can solve the problems of limiting the application of ferrite absorbing materials, being expensive, and being difficult to buy, and achieves absorbing performance. High quality, low price and wide source of raw materials

Inactive Publication Date: 2008-09-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-purity lithium oxide raw material required in the existing traditional ball milling and calcination method is difficult to buy due to its application in emerging fuel cells, and it is expensive, which greatly limits the application of this ferrite absorbing material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation of 0.1 mole doped magnesium and yttrium (yttrium stoichiometric ratio is 0.005) lithium zinc ferrite material:

[0017] (1) According to the elemental stoichiometric ratio of the material system lithium: zinc: iron: magnesium: yttrium = 0.35: 0.3: 2.35: 0.0054: 0.005, respectively weigh 2.4133 grams of analytical pure lithium nitrate, 8.9247 grams of zinc nitrate, iron nitrate 94.94 grams, 1.3957 grams of magnesium nitrate, 0.1915 grams of yttrium nitrate, simultaneously take by weighing analytically pure citric acid 64.2914 grams in the ratio of 1: 1 by the mol ratio of citric acid and metal cation total amount. Dissolve these raw materials together in deionized water, stir thoroughly, and prepare a clear precursor aqueous solution of 0.425 g / ml.

[0018] (2) Add a certain amount of ammonia water dropwise to the precursor aqueous solution obtained in step (1), stir while dropping, and adjust its pH value to 7. Electromagnetic stirring was performed for 2 h...

Embodiment 2

[0022] Preparation of 0.1 mole doped magnesium and yttrium (yttrium stoichiometric ratio is 0.01) lithium zinc ferrite material

[0023] (1) According to the elemental stoichiometric ratio of the material system lithium: zinc: iron: magnesium: yttrium = 0.35: 0.3: 2.35: 0.0054: 0.01, respectively weigh 2.4133 grams of analytical pure lithium nitrate, 8.9247 grams of zinc nitrate, iron nitrate 94.94 grams, 1.3957 grams of magnesium nitrate, 0.3829 grams of yttrium nitrate, simultaneously take by weighing analytically pure citric acid 64.3965 grams in the ratio of 1: 1 by the molar ratio of citric acid and metal cation total amount. Dissolve these raw materials together in deionized water, stir well, and prepare a clear precursor aqueous solution of 0.567 g / ml.

[0024] (2) Add a certain amount of ammonia water dropwise to the precursor aqueous solution obtained in step 1, and stir while dropping to adjust its pH value to 7. Electromagnetic stirring was performed for 2 hours, a...

Embodiment 3

[0028] Preparation of 0.1 mole doped magnesium and yttrium (yttrium stoichiometric ratio is 0.008) lithium zinc ferrite material

[0029] (1) According to the elemental stoichiometric ratio of the material system lithium: zinc: iron: magnesium: yttrium = 0.35: 0.3: 2.35: 0.0054: 0.008, respectively weigh 2.4133 grams of analytical pure lithium nitrate, 8.9247 grams of zinc nitrate, iron nitrate 94.94 grams, 1.3957 grams of magnesium nitrate, 0.3063 grams of yttrium nitrate, simultaneously take by weighing analytically pure citric acid 64.3544 grams in the ratio of 1: 1 by the molar ratio of citric acid and metal cation total amount. Dissolve these raw materials together in deionized water, stir well, and prepare a clear precursor aqueous solution of 0.5 g / ml.

[0030] (2) Add a certain amount of ammonia water dropwise to the precursor aqueous solution obtained in step (1), stir while dropping, and adjust its pH value to 7. Electromagnetic stirring was performed for 2 hours, a...

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PUM

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Abstract

The invention discloses an electromagnetic wave absorbing material of lithium-zinc ferrite, including chemical elements of lithium, zinc, iron, magnesium, yttrium and oxygen at a stoichiometric ratio, lithium: zinc: iron: magnesium: yttrium: oxygen of 0.35:0.3:2.35:0.0054: 0.0048-0.0097:4. The preparation method of electromagnetic wave absorbing material includes: preparing nitrate mixture solutions of each elements according to the ferrite stoichiometric ratio; mixing a citric acid solution with ammonia to form a gel network forming agent and producing a corresponding ferrite dry gel with sol-gel method; making a heat treatment to the dry gel with a certain heating rate and at a calcination temperature; obtaining a corresponding magnesium-and-yttrium-doped lithium-zinc ferrite material. The magnesium-and-yttrium-doped lithium-zinc ferrite micron material has an excellent wave-absorbing performance at a low frequency between 0.5 GHz and 3 GHz and the required raw materials are low in cost and wide in application.

Description

technical field [0001] The invention relates to a micron lithium-zinc ferrite material doped with magnesium and rare earth element yttrium and a preparation method thereof, belonging to the technical field of electromagnetic wave absorbing materials. Background technique [0002] Micron-sized lithium-zinc ferrite doped with a small amount of magnesium has excellent wave-absorbing performance in the frequency range of 0.8-1.3GHz and 11.8-12.3GHz, and the reflection blocking attenuation (R L ) can reach -40dB and -35dB respectively, and the effective absorbing bandwidth (R L The value is not greater than -10dB) can reach 0.5GHz. However, the high-purity lithium oxide raw material required in the existing traditional ball milling and calcination method is difficult to buy due to its application in emerging fuel cells, and is expensive, which greatly limits the application of this ferrite wave-absorbing material. The sol-gel method has the advantages of readily available raw m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/624
Inventor 孙康宁曹晓非魏源冷亮
Owner SHANDONG UNIV
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