A kind of multiferroic absorbing material and preparation method thereof

A technology of iron absorption and perovskite oxide, which is applied in the field of modified multiferroic microwave absorption materials and its preparation, can solve the problems of weak magnetic properties, difficulty in achieving impedance matching, and inability to provide high magnetic loss, etc., and achieve absorption frequency bandwidth , process conditions are easy to control, and the effect of good microwave absorption characteristics

Active Publication Date: 2021-11-09
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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  • A kind of multiferroic absorbing material and preparation method thereof
  • A kind of multiferroic absorbing material and preparation method thereof
  • A kind of multiferroic 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

A multiferroic wave-absorbing material and a preparation method thereof, the material belongs to a class of Aurivillius phase bismuth-layered perovskite oxides, and its chemical formula is Bi 5‑x R x Fe 1‑y Ni y Ti 3 o 15 ,in x 0.5≤ x ≤0.75, y 0.3≤ y ≤0.5; in the chemical formula, R is one of the rare earth elements Nd and Sm; the present invention also includes the preparation method of the multiferroic wave-absorbing material. The material of the invention has excellent magnetic properties, good reflection loss characteristics in the 8-18GHz microwave frequency band, high absorption strength and wide absorption frequency band. The preparation method is simple to operate, the process conditions are easy to control and has broad application prospects.

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 Patents(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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