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Al<3+>-doped Bi2Fe4O9 multiferroic ceramic material and preparation method thereof

A technology of multiferroic ceramics and multiferroic ceramics, which is applied in the field of multiferroic ceramic materials, can solve the problems that there are no reports on multiferroic ceramic materials, and achieve the effects of short sintering time, simple preparation process and low phase formation temperature

Inactive Publication Date: 2014-12-03
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, Al prepared by the citric acid-nitrate sol-gel method 3+ Doped with Bi 2 Fe 4 o 9 There is no report on multiferroic ceramic materials

Method used

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  • Al&lt;3+&gt;-doped Bi2Fe4O9 multiferroic ceramic material and preparation method thereof
  • Al&lt;3+&gt;-doped Bi2Fe4O9 multiferroic ceramic material and preparation method thereof
  • Al&lt;3+&gt;-doped Bi2Fe4O9 multiferroic ceramic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Bi was prepared by the citric acid-nitrate sol-gel method 2 Fe 4-x Al x o 9 (x=0) multiferroic ceramics. In the first step, weigh 0.06mol of citric acid and put it into a 100mL beaker, add 20mL of distilled water, dissolve under magnetic stirring to form a transparent solution, then weigh 0.02mol of bismuth nitrate, 0.04mol of ferric nitrate, and add the above citric acid solution, and magnetically stirred to form a homogeneous solution, wherein the molar ratio of citric acid to the above two metal cations is 1:1. In the second step, adjust the pH value to 7 with ammonia water under constant stirring, and age the mixed solution for 12 hours; then evaporate the solution to dryness in a water bath at 80°C to remove water, and dry it in an oven at 150°C until a black dry gel. The third step is to fully grind the collected xerogel, heat-treat it in the air at 500°C for 6 hours, remove organic matter, and obtain the precursor powder; then grind the precursor powder, pre...

Embodiment 2

[0021] Bi was prepared by the citric acid-nitrate sol-gel method 2 Fe 4-x Al x o 9 (x=0.2) Multiferroic ceramics. The first step, weigh 0.072mol of citric acid and put it into a 100mL beaker, add 20mL of distilled water, dissolve under magnetic stirring to form a transparent solution, then weigh 0.02mol of bismuth nitrate, 0.038mol of iron nitrate, 0.002mol of aluminum nitrate, and added into the above citric acid solution, and magnetically stirred to form a uniform solution, wherein the molar ratio of citric acid to the above three metal cations is 1.2:1. In the second step, adjust the pH value to 7 with ammonia water under constant stirring, and age the mixed solution for 18 hours; then evaporate the solution to dryness in a water bath at 90°C to remove water, and dry it in an oven at 160°C until a black dry gel. The third step is to fully grind the collected xerogel, heat-treat it in the air at 550°C for 5 hours, remove organic matter, and obtain the precursor powder; ...

Embodiment 3

[0024] Bi was prepared by the citric acid-nitrate sol-gel method 2 Fe 4-x Al x o 9 (x=0.4) Multiferroic ceramics. In the first step, weigh 0.078mol of citric acid and put it into a 100mL beaker, add 20mL of distilled water, and dissolve under magnetic stirring to form a transparent solution. and added into the above citric acid solution, and magnetically stirred to form a uniform solution, wherein the molar ratio of citric acid to the above three metal cations was 1.3:1. In the second step, adjust the pH value to 8 with ammonia water under constant stirring, and age the mixed solution for 20 hours; then evaporate the solution to dryness in a water bath at 100°C to remove water, and dry it in an oven at 170°C until a black dry gel. The third step is to fully grind the collected xerogel, heat-treat it in the air at 600°C for 4 hours, remove organic matter, and obtain the precursor powder; then grind the precursor powder, press the tablet and sinter, the sintering temperatur...

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Abstract

The invention relates to an Al<3+>-doped Bi2Fe4O9 multiferroic ceramic material and a preparation method thereof. A citric acid-nitrate sol-gel process is adopted through high-temperature treatment to obtain the multiferroic ceramic material of which the molecular formula is Bi2Fe[4-x]AlxO9 (x=0, 0.2, 0.4, 0.6). The ceramic material has single-phase structure and room-temperature multiferroic property, and the room-temperature magnetism and ferroelectricity of the material can be adjusted by changing the doping amount of the Al<3+>. The method has the advantages of simple preparation technique, low sintering temperature, short sintering time, low cost, no need of reducing atmosphere, environmental protection, no toxicity and no pollution.

Description

technical field [0001] The invention relates to the technical field of multiferroic ceramic materials, in particular to a non-magnetic metal ion Al 3+ Doped with Bi 2 Fe 4 o 9 Room temperature multiferroic ceramic material and its preparation method. Background technique [0002] Multiferroic materials refer to materials in which ferroelectricity, ferromagnetism and ferroelasticity coexist in order at a certain temperature and have magnetoelectric / elastic coupling properties. The interaction between such multiple order parameters makes up for the pure (anti) The lack of ferroelectric, (anti)ferromagnetic, or ferroelastic materials provides an additional degree of freedom for the design of next-generation multifunctional electronic information recording devices. At the same time, the magnetoelectric coupling effect of multiferroic materials is different from other magnetoelectric coupling materials in that, in addition to the magnetoelectric effect induced by the external...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 袁松柳黄帅孙海根时丽然
Owner HUAZHONG UNIV OF SCI & TECH
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