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Method for preparing multiferroic single-phase bismuth ferric ceramic

A bismuth ferrite and multiferroic technology, applied in the field of material science, can solve the problems of large spiral period length, etc., and achieve the effects of saving electric energy, good insulation performance, and simple equipment and preparation process

Inactive Publication Date: 2011-10-26
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the length of the helical period is greater than 62nm, thereby proposing a preparation method of multiferroic single-phase bismuth ferrite ceramics, so that the texture of bismuth ferrite ceramics after sintering is composed of nanoparticles with a particle size of less than 62nm composition

Method used

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  • Method for preparing multiferroic single-phase bismuth ferric ceramic

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Experimental program
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Effect test

Embodiment 1

[0026] 1. Weigh BiCl with a molar ratio of 1.1:1 3 (20.8g) and FeCl 3 ·6H 2 O (16.2g), heated and stirred at 80°C, fully dissolved in 200ml of ethylene glycol, the sol concentration was about 0.3mol / L, forming a reddish-brown uniform sol.

[0027] 2. Place the sol obtained in step 1 in an oven and dry it at 120° C. to form a light yellow xerogel.

[0028] 3. Put the xerogel obtained in step 2 into a mortar for grinding, pass it through a 200-mesh sieve to obtain a loose xerogel powder, and transfer it to an alumina crucible.

[0029] 4. Put this alumina crucible into the furnace for the first pre-firing. After rising from room temperature to 400 °C at a heating rate of 3 °C / min, cool down to room temperature with the furnace without heat preservation.

[0030] 5. Repeat step 4 for the second pre-calcination to obtain reddish-brown precursor powder.

[0031] 6. Grind the precursor powder obtained in step 5 again, granulate with deionized water, and press into a mold to for...

Embodiment 2

[0034] 1. Weigh Bi(NO 3 ) 3 ·5H 2 O(40.50g) and Fe(NO 3 ) 3 9H 2 O (33.67g), heated and stirred at 80°C, fully dissolved in 200ml of ethylene glycol, the sol concentration is about 0.4mol / L, forming a reddish-brown uniform sol.

[0035] 2. Place the sol obtained in step 1 in an oven and dry it at 80° C. to form a light yellow xerogel.

[0036] 3. Put the xerogel obtained in step 2 into a mortar for grinding to obtain a loose xerogel powder, and transfer it to an alumina crucible.

[0037] 4. Put this alumina crucible into the furnace for the first pre-firing. After rising from room temperature to 400 °C at a heating rate of 5 °C / min, it is cooled to room temperature with the furnace without heat preservation.

[0038] 5. Repeat step 4 for the second pre-calcination to obtain reddish-brown precursor powder.

[0039]6. Grind the precursor powder obtained in step 5 again, granulate with deionized water, and press into a mold to form a tablet. The forming pressure is 2 MP...

Embodiment 3

[0042] 1. Weigh Bi(NO 3 ) 3 ·5H 2 O(53.35g) and Fe(NO 3 ) 3 9H 2 O (33.67g), heated and stirred at 80°C, fully dissolved in 200ml of ethylene glycol, the sol concentration is about 0.4mol / L, forming a reddish-brown uniform sol.

[0043] 2. Place the sol obtained in step 1 in an oven and dry it at 100° C. to form a light yellow xerogel.

[0044] 3. Put the xerogel obtained in step 2 into a mortar for grinding, pass it through a 200-mesh sieve to obtain a loose xerogel powder, and transfer it to an alumina crucible.

[0045] 4. Put this alumina crucible into the furnace for the first pre-firing. After rising from room temperature to 400 °C at a rate of 1 °C / min, cool down to room temperature with the furnace without heat preservation.

[0046] 5. Repeat step 4 for the second pre-calcination to obtain reddish-brown precursor powder.

[0047] 6. Grind the precursor powder obtained in step 5 again, granulate with deionized water, and press into a mold to form a tablet. The...

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Abstract

A method for preparing multiferroic single-phase bismuth ferric ceramic belongs to the technical field of material science. The method provided by the invention comprises the following concrete steps of: carrying out two pre-burning treatments on the bismuth ferric xerogel produced by the sol-gel method, namely heating to 400DEG C from room temperature at the heating rate of 1-5 DEG C / min for twotimes, to obtain a bismuth ferric precursor powder; pressing the bismuth ferric precursor powder into a sheet at a pressure of 2-4MPa, followed by sintering at low temperature, namely heating up fromroom temperature to 450-550 DEG C at the heating rate of 3-5 DEG C / min, to obtain the textural single-phase bismuth ferric ceramic made of nanometer particles whose particle size is less than 62nm. The bismuth ferric ceramic prepared by the method in the invention has good single-phase and insulating properties, saturated magnetic hysteresis loops and electric hysteresis loops at room temperatureas well as highly saturated magnetic intensity and remanent polarization. In addition, the method for preparing the multiferroic single-phase bismuth ferric ceramic requires simple equipment as well as a simple preparation technology, adopts the low temperature sintering technology, saves energy and has low cost.

Description

technical field [0001] The invention relates to a preparation method of multiferroic single-phase bismuth ferrite ceramics, belonging to the technical field of material science. Background technique [0002] Because multiferroic materials have physical properties such as ferroelectricity (antiferroelectricity), ferromagnetism (antiferromagnetism), and ferroelasticity at the same time, under the action of an external field (electric field, magnetic field, force field), different types of Coupling occurs between features. For example, the magnetization of a material can be controlled by an electric field or the polarization of a material can be controlled by a magnetic field. This coupling between multiple ferroic properties makes this kind of material have important application prospects in the field of new devices, such as non-volatile memory, transducer, detector and so on. However, these multifunctional devices all require strong coupling, and the multiferroicity exhibit...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 曹传宝姚锐敏
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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