A bi2fe4o9 multiferroic ceramic material and preparation method thereof

A technology of multiferroic ceramics and ferric nitrate, which is applied in the field of information functional materials, can solve the problems that there are no reports on multiferroic ceramics, and achieve the effect of low cost

Inactive Publication Date: 2014-10-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, Bi is prepared by the self-propagating combustion reaction of citric acid-nitrate sol-gel method, treated with a magnetic field, and annealed at high temperature. 2 Fe 4 o 9 There is no report on multiferroic ceramics

Method used

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  • A bi2fe4o9 multiferroic ceramic material and preparation method thereof
  • A bi2fe4o9 multiferroic ceramic material and preparation method thereof
  • A bi2fe4o9 multiferroic ceramic material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] Prepared by the citric acid-nitrate sol-gel self-propagating combustion reaction method. After being treated by 0.35T magnetic field, the annealing temperature is 650℃. Bi 2 Fe 4 O 9 Multiferroic ceramics. In the first step, weigh 0.12 mol of citric acid into a 100 mL beaker, add 30 mL of deionized water, and dissolve under ultrasonic dispersion to form a transparent solution; then weigh 0.04 mol of ferric nitrate and add it to the above solution under constant stirring. After dissolving, weigh 0.02mol of bismuth nitrate and add it to the above solution and dissolve it; under ultrasonic dispersion, add 8ml of ethylene glycol to form a transparent solution; wherein the molar ratio of citric acid to the above two metals is 1.5 :1. In the second step, under constant stirring, adjust the pH to 7 with ammonia water, and age the mixed solution in a water bath for 10 hours. Then, evaporate the solution to dryness in a water bath at 80°C to obtain the corresponding gel. Dry it ...

Embodiment 2

[0028] Prepared by citric acid-nitrate sol-gel self-propagating combustion reaction method. After being treated by 0.4T magnetic field, the annealing temperature is 700℃. Bi 2 Fe 4 O 9 Multiferroic ceramics. In the first step, weigh 0.12 mol of citric acid into a 100 mL beaker, add 30 mL of deionized water, and dissolve under ultrasonic dispersion to form a transparent solution; then weigh 0.04 mol of ferric nitrate and add it to the above solution under constant stirring. After dissolving, weigh 0.02 mol of bismuth nitrate and add it to the above solution and dissolve it; under ultrasonic dispersion, add 8 ml of ethylene glycol to form a transparent solution; wherein the molar ratio of citric acid to the above two metals is 2 :1. In the second step, under constant stirring, adjust the pH to 7 with ammonia water, and age the mixed solution in a water bath for 11 hours. Then, the solution was evaporated to dryness in a water bath at 100°C to obtain the corresponding gel, which ...

Embodiment 3

[0031] Prepared by citric acid-nitrate sol-gel self-propagating combustion reaction method. After being treated by 0.4T magnetic field, the annealing temperature is 800℃. Bi 2 Fe 4 O 9 Multiferroic ceramics. In the first step, weigh 0.12 mol of citric acid into a 100 mL beaker, add 30 mL of deionized water, and dissolve under ultrasonic dispersion to form a transparent solution; then weigh 0.04 mol of ferric nitrate and add it to the above solution under constant stirring. After dissolving, weigh 0.02 mol of bismuth nitrate and add it to the above solution and dissolve it; under ultrasonic dispersion, add 8 ml of ethylene glycol to form a transparent solution; wherein the molar ratio of citric acid to the above two metals is 2 :1. In the second step, under constant stirring, adjust the pH to 7 with ammonia water, and age the mixed solution in a water bath for 11 hours. Then, the solution was evaporated to dryness in a water bath at 100°C to obtain the corresponding gel, which ...

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Abstract

The invention discloses a Bi2Fe4O9 multiferroic ceramic material and a preparation method thereof. The Bi2Fe4O9 multiferroic ceramic material is prepared by adopting a citric acid-nitrate sol-gel self-propagating combustion reaction method and by carrying out magnetic field treatment and high-temperature annealing. The ceramic material has the advantages of structural single-phase and room temperature multiferroic property, capabilities of adjusting the magnetism and the ferroelectricity of the material through different annealing temperatures after the material is subjected to magnetic field treatment, and the like. The preparation method is low in cost, needs no reduction atmosphere and is environment-friendly, non-toxic and pollution-free.

Description

Technical field [0001] The invention belongs to the technical field of information functional materials, and specifically relates to a Bi 2 Fe 4 O 9 Multiferroic ceramic materials and preparation methods thereof. Background technique [0002] Functional materials refer to those with special magnetic, electrical, optical, thermal and other functions, excellent physical or chemical effects, and can achieve mutual transformation between functions under specific conditions, and are targeted for the development of various high-tech and new industries. Sexually applied materials. There are many types of functional materials, including multiferroic materials, superconducting materials, semiconductor materials, and piezoelectric, pyroelectric and ferroelectric materials or microelectronic materials, photonic materials, etc. [0003] Multiferroic materials are a kind of magnetoelectric functional materials that coexist ferroelectric and ferromagnetic due to electromagnetic order. In recent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 袁松柳席英邱洋黄丽珍
Owner HUAZHONG UNIV OF SCI & TECH
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