Dysprosium-doped BiFeO3 multi-ferroic ceramic block and preparation method thereof

A multiferroic and bulk technology, applied in the field of functional ceramics, can solve the problems of large leakage current and difficulty in displaying macroscopic magnetic moments, and achieve the effects of good ferroelectricity, low cost, good ferromagnetism and ferroelectricity

Inactive Publication Date: 2012-06-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the BiFeO 3 It has a spatially modulated spin structure, and the helical period is about 62nm. This modulation structure causes the ion magnetic moments to cancel each other out, making BiFeO 3 It is difficult to show the macroscopic magnetic moment. At present, the BiFeO prepared by the existing technology 3 Bulk ceramics are all antiferromagnetic, which largely limits the BiFeO 3 The application of bulk ceramics; on the other hand, due to Bi 3+ volatilization and Fe 3+ Valence fluctuations (Fe 3+ → Fe 2+ ) leads to BiFeO 3 The leakage current is large, which limits its application
In BiFeO 3 Medium doping rare earth elements can destroy BiFeO 3 The helical spin magnetic structure makes BiFeO 3 produce macroscopic magnetization and can effectively suppress the Bi 3+ volatilization and Fe 3+ valence fluctuations, thereby increasing the BiFeO 3 The ferroelectricity, however, is currently relevant for the preparation of Dy-doped BiFeO 3 Multiferroic bulk ceramics to enhance BiFeO 3 There are few reports on the ferroelectric properties of , and the prepared Dy-doped BiFeO 3 Multiferroic bulk ceramics are all antiferromagnetic, and Dy-doped BiFeO with ferromagnetism has not been seen yet. 3 Related reports on multiferroic bulk ceramics

Method used

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  • Dysprosium-doped BiFeO3 multi-ferroic ceramic block and preparation method thereof
  • Dysprosium-doped BiFeO3 multi-ferroic ceramic block and preparation method thereof
  • Dysprosium-doped BiFeO3 multi-ferroic ceramic block and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A BiFeO 3 A method for preparing a multiferroic bulk ceramic, the method is carried out according to the following steps:

[0031] Step 1, take by weighing 30.559g of Bi(NO 3 ) 3 ·5H 2 O was added with 100ml of glacial acetic acid, heated to 65°C with a magnetic stirrer and stirred to dissolve to obtain solution 1; weigh 24.24g of Fe(NO 3 ) 3 9H 2 O was dissolved in 50ml deionized water to obtain solution 2.

[0032] Step 2, mixing the solutions 1 and 2 to obtain a mixed solution, making the Bi in the mixed solution 3+ The ion concentration is 0.4mol / L; add 12.923g citric acid to the mixed solution, heat to 85°C with a magnetic stirrer and stir, add 10% ammonia water dropwise during heating and stirring to adjust the pH=1 of the mixed solution; continue Heat and stir until a gel is obtained.

[0033] Step 3: Bake the gel at 130°C for 12 hours to foam to obtain an airgel; grind the airgel with an agate mortar to obtain a nanoscale powder; heat the powder and slow...

Embodiment 2

[0040] A Dy-doped BiFeO 3 A method for preparing a multiferroic bulk ceramic, the method is carried out according to the following steps:

[0041] Step 1, take by weighing 29.254g of Bi(NO 3 ) 3 ·5H 2 O was dissolved in 100ml of glacial acetic acid, heated to 70°C with a magnetic stirrer and stirred to dissolve to obtain solution 1; weigh 0.224g of Dy 2 o 3 Adding 20ml concentration is that 5% dilute nitric acid aqueous solution dissolves and obtains solution 2; Fe(NO 3 ) 3 9H 2 O was dissolved in 30ml deionized water to obtain solution 3.

[0042] Step 2, mixing the solutions 1, 2 and 3 to obtain a mixed solution, making Bi in the mixed solution 3+ The ion concentration is 0.4mol / L; add 12.914g citric acid to the mixed solution, heat to 85°C with a magnetic stirrer and stir, add 10% ammonia water dropwise during heating and stirring to adjust the pH of the mixed solution to 1.5, and continue Heat and stir until a gel is obtained.

[0043] Step 3: Bake the gel at 130...

Embodiment 3

[0050] A Dy-doped BiFeO 3 A method for preparing a multiferroic bulk ceramic, the method is carried out according to the following steps:

[0051] Step 1, take by weighing 29.031g of Bi(NO 3 ) 3 ·5H 2 O was dissolved in 100ml of glacial acetic acid, heated to 80°C with a magnetic stirrer and stirred to dissolve to obtain solution 1; weigh 1.119g of Dy 2 o 3 Adding 20ml concentration is that 5% dilute nitric acid aqueous solution dissolves and obtains solution 2; Fe(NO 3 ) 3 9H 2 O was dissolved in 50ml deionized water to obtain solution 3.

[0052] Step 2, mixing solutions 1, 2 and 3 to obtain a mixed solution, making the Bi in the mixed solution 3+ The ion concentration is 0.4mol / L; add 12.908g citric acid to the mixed solution, heat to 90°C with a magnetic stirrer and stir, add 10% ammonia water dropwise to adjust the pH of the mixed solution to 1, and continue heating and stirring until the condensate is obtained. glue.

[0053] Step 3: Bake the gel at 130°C for 1...

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Abstract

The invention relates to a dysprosium-doped BiFeO3 multi-ferroic ceramic block and a preparation method thereof and belongs to the field of functional ceramic. The preparation method comprises the following steps: weighting Bi(NO3)3.5H2O, Dy2O3 and Fe(NO3)3.9H2O at a ratio of (1-x):x:1; respectively dissolving in glacial acetic acid, diluted nitric acid and water, heating and stirring; mixing thethree solutions, and then adding citric acid, heating and stirring; after adjusting PH, continuously heating and stirring, thereby obtaining gel; foaming the gel, thereby obtaining aerogel; crushing the aerogel, thereby obtaining powder; pre-processing the powder; making the pre-processed powder into block and sintering; and removing a surface oxide layer, thereby obtaining the B(i1-x)DyxFeO3 multi-ferroic ceramic block, wherein x is equal to 0.03-0.20. The Bi(1-x)DyxFeO3 multi-ferroic ceramic block is single-phase ceramic; the ferroelectricity is enhanced; and when x is equal to 0.05 and 0.07, the ceramic block has ferromagnetism at room temperature.

Description

technical field [0001] The invention relates to a dysprosium (Dy) doped BiFeO 3 Multiferroic bulk ceramics and preparation method thereof, in particular, relates to a BiFeO doped with Dy at the A site 3 The invention relates to a multiferroic bulk ceramic and a preparation method thereof; it belongs to the field of functional ceramics. Background technique [0002] With the advancement of science and technology, the requirements for device miniaturization are getting higher and higher, which requires the development of new materials with two or more functions at the same time, so as to develop new devices that can realize multiple functions at the same time. BiFeO 3 It is the only multiferroic material that exhibits both ferroelectricity and antiferromagnetism at room temperature, and its ferroelectric Curie temperature T C About 830°C, the antiferromagnetic Neel temperature T N About 370°C. However, due to the BiFeO 3 It has a spatially modulated spin structure, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40C04B35/622
Inventor 李祥刘盛楠王琳
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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