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: 2013-07-10
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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  • Bi2Fe4O9 multiferroic ceramic material and preparation method thereof
  • Bi2Fe4O9 multiferroic ceramic material and preparation method thereof
  • 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 the 0.35T magnetic field treatment, the annealing temperature is 650 ℃ Bi sintered in the air 2 Fe 4 o 9 multiferroic ceramics. In the first step, weigh 0.12mol of citric acid and put it into a 100mL beaker, add 30mL of deionized water, and dissolve it under ultrasonic dispersion to form a transparent solution; then weigh 0.04mol of ferric nitrate and add it to the above solution to dissolve under constant stirring. After being dissolved, weigh 0.02mol of bismuth nitrate and add to the above solution and dissolve; under ultrasonic dispersion, add 8ml of ethylene glycol to form a transparent solution; wherein, the molar ratio of citric acid to the sum of the above two metals is 1.5 :1. In the second step, under the condition of constant stirring, the pH value was adjusted to 7 with ammonia water, and the mixed solution was aged in a water bath for 10 hours. Then, evaporate ...

Embodiment 2

[0028] Prepared by citric acid-nitrate sol-gel self-propagating combustion reaction method, after 0.4T magnetic field treatment, the annealing temperature is 700 ℃ Bi sintered in air 2 Fe 4 o 9 multiferroic ceramics. In the first step, weigh 0.12mol of citric acid and put it into a 100mL beaker, add 30mL of deionized water, and dissolve it under ultrasonic dispersion to form a transparent solution; then weigh 0.04mol of ferric nitrate and add it to the above solution to dissolve under constant stirring. After being dissolved, weigh 0.02mol of bismuth nitrate and add to the above solution and dissolve; under ultrasonic dispersion, add 8ml of ethylene glycol to form a transparent solution; wherein, the molar ratio of citric acid to the sum of the above two metals is 2 :1. In the second step, under constant stirring, the pH value was adjusted to 7 with ammonia water, and the mixed solution was aged in a water bath for 11 hours. Then, evaporate the solution to dryness in a wat...

Embodiment 3

[0031] Prepared by citric acid-nitrate sol-gel self-propagating combustion reaction method, after 0.4T magnetic field treatment, the annealing temperature is 800 ℃ Bi sintered in air 2 Fe 4 o 9 multiferroic ceramics. In the first step, weigh 0.12mol of citric acid and put it into a 100mL beaker, add 30mL of deionized water, and dissolve it under ultrasonic dispersion to form a transparent solution; then weigh 0.04mol of ferric nitrate and add it to the above solution to dissolve under constant stirring. After being dissolved, weigh 0.02mol of bismuth nitrate and add to the above solution and dissolve; under ultrasonic dispersion, add 8ml of ethylene glycol to form a transparent solution; wherein, the molar ratio of citric acid to the sum of the above two metals is 2 :1. In the second step, under constant stirring, the pH value was adjusted to 7 with ammonia water, and the mixed solution was aged in a water bath for 11 hours. Then, evaporate the solution to dryness in a wat...

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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, in particular to a Bi 2 Fe 4 o 9 Multiferroic ceramic material and its preparation method. Background technique [0002] Functional materials refer to those that have special magnetic, electrical, optical, thermal and other functions, excellent physical or chemical effects, and can realize mutual transformation between functions under specific conditions, and have targeted effects on the development of various high-tech and the formation of new industries. materials for sexual applications. There are many types of functional materials, including multiferroic materials, superconducting materials, semiconductor materials, piezoelectric, pyroelectric and ferroelectric materials or microelectronic materials, photonic materials, etc. [0003] Multiferroic materials are a class of magnetoelectric functional materials in which ferroelectricity and ferromagnetism coexist due ...

Claims

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Application Information

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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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