Multiferroic wave absorbing material and preparation method thereof

An iron-absorbing and layered technology, which is applied in the field of modified multiferroic microwave absorbing materials and its preparation, can solve the problems of inability to provide high magnetic loss, weak magnetic properties, and difficulty in achieving impedance matching, and achieve good microwave absorption characteristics, absorption The effect of wide frequency bandwidth and easy control of process conditions

Active Publication Date: 2020-03-27
HUNAN INSTITUTE OF ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thanks Bi 5 FeTi 3 o 15 It exhibits localized antiferromagnetic order at room temperature, and its magnetic properties are weak; as a wave-absorbing material, it cannot provide high magnetic loss, and it is also difficult to achieve impedance matching

Method used

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  • Multiferroic wave absorbing material and preparation method thereof
  • Multiferroic wave absorbing material and preparation method thereof
  • Multiferroic wave absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The chemical formula of the multiferroic absorbing material in this embodiment is Bi 5-x R x Fe 1-y Ni y Ti 3 o 15 ( x =0.75, y =0.5; R is Nd); its preparation method is:

[0046] (1) Bi 4-x R x Ti 3 o 12 Preparation of sol: Weigh 78.82g bismuth nitrate pentahydrate (99% purity), 16.43g neodymium nitrate hexahydrate (99% purity) and 51.05g titanic acid according to the stoichiometric ratio of Bi:Nd:Ti 3.25:0.75:3 Add 500mL of deionized water, 23.52g of ethylenediaminetetraacetic acid (98% of purity) and 61.85g of citric acid (98% of purity) into n-butyl ester (98% of purity), heat and stir to obtain a uniform mixture; then use Adjust the pH value to neutral with ammonia water, place it in a water bath at a constant temperature of 90°C, heat and stir for 4 hours, and obtain a stable and uniform Bi 4-x R x Ti 3 o 12 Sol;

[0047] (2) Bi 4-x R x Ti 3 o 12 Preparation of powder: Place the sol obtained in step (1) in a drying oven at 160°C and dry for 4 h...

Embodiment 2

[0060] The chemical formula of the multiferroic absorbing material in this embodiment is Bi 5-x R x Fe 1-y Ni y Ti 3 o 15 ( x =0.5, y =0.5; R is Sm), its preparation method is:

[0061] (1) Bi 4-x R x Ti 3 o 12 Preparation of sol: Weigh 84.89g bismuth nitrate pentahydrate (99% purity), 10.66g samarium nitrate pentahydrate (99% purity) and 51.05g titanic acid according to Bi:Sm:Ti stoichiometric ratio 3.5:0.5:3 Add 500mL of deionized water, 23.52g of ethylenediaminetetraacetic acid (98% of purity) and 61.85g of citric acid (98% of purity) into n-butyl ester (98% of purity), heat and stir to obtain a uniform mixture, and then use Adjust the pH value to neutral with ammonia water, place it in a water bath with a constant temperature of 85°C, heat and stir for 5 hours, and obtain a stable and uniform Bi 4-x R x Ti 3 o 12 Sol;

[0062] (2) Bi 4-x R x Ti 3 o 12 Preparation of powder: the Bi obtained in step (1) 4-x R x Ti 3 o 12 The sol was dried in a drying ...

Embodiment 3

[0071] The chemical formula of the multiferroic absorbing material in this embodiment is Bi 5-x R x Fe 1-y Ni y Ti 3 o 15 ( x =0.75, y =0.45; R is Sm), its preparation method is:

[0072] (1) Bi 4-x R x Ti 3 o 12 Preparation of sol: Weigh 78.82g bismuth nitrate pentahydrate (purity 99%), 15.99g samarium nitrate pentahydrate (purity 99%) and 51.05g titanic acid according to the stoichiometric ratio of Bi:Sm:Ti 3.25:0.75:3 Add 500mL of deionized water, 31.56g of ethylenediaminetetraacetic acid (98% of purity) and 59.95g of citric acid (98% of purity) into n-butyl ester (98% of purity), heat and stir to obtain a uniform mixture; then use Adjust the pH value to 7 with ammonia water, place it in a water bath with a constant temperature of 90°C, heat and stir for 4 hours, and obtain a stable and uniform Bi 4-x R x Ti 3 o 12 Sol;

[0073] (2) Bi 4-x R x Ti 3 o 12 Preparation of powder: the Bi obtained in step (1) 4-x R x Ti 3 o 12 The sol was dried in a drying...

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Abstract

The invention discloses a multiferroic wave absorbing material and a preparation method thereof. The material belongs to a kind of Aurivillius phase bismuth layered perovskite oxides, and has a chemical formula of Bi<5-x>R<x>Fe<1-y>N<y>Ti<3>O<15>, 0.5<=x<=0.75, 0.3<=y<=0.5, and R is one of rare earth elements (Nd and Sm). The invention also provides a preparation method of the multiferroic wave absorbing material. The material has an excellent magnetic performance, a good reflection loss characteristic in a microwave frequency band of 8-18 GHz, a high absorption strength, and a wide absorptionfrequency band. The preparation method has the advantages of simple operation, easily controlled technological conditions, and wide application prospect.

Description

technical field [0001] The invention relates to a microwave-absorbing material and a preparation method thereof, in particular to a modified multiferroic microwave-absorbing material and a preparation method thereof. Background technique [0002] With the development of electronic information technology, problems such as electromagnetic interference or pollution, information security, and detection have become more and more prominent. In order to meet the needs of civilian electromagnetic protection and military invisibility, wave-absorbing materials have shown more and more important application and research values. In the context of new applications, new challenges including "thinness, lightness, width, strength, and heat" are raised for absorbing materials, and it is of great significance to develop absorbing materials with excellent comprehensive properties. The performance of absorbing materials mainly depends on the reflective characteristics and loss characteristics o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40C04B35/624
CPCC04B35/2608C04B35/624C04B2235/3224C04B2235/3232C04B2235/3272C04B2235/3279C04B2235/3298
Inventor 刘胜贺君颜铄清程玉兰
Owner HUNAN INSTITUTE OF ENGINEERING
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