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Method for preparing bismuth ferrite material by two-step solid-phase reaction

A technology of solid phase reaction and room temperature solid phase reaction, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of limited chemical reaction and slow diffusion

Inactive Publication Date: 2011-04-13
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional concept of solid phase reaction is that the diffusion between solids or in solids at room temperature is too slow, which limits the progress of chemical reactions

Method used

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  • Method for preparing bismuth ferrite material by two-step solid-phase reaction
  • Method for preparing bismuth ferrite material by two-step solid-phase reaction
  • Method for preparing bismuth ferrite material by two-step solid-phase reaction

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Experimental program
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Effect test

Embodiment 1

[0019] According to the molar ratio of Bi:Fe:NaOH=1:1:1, weigh bismuth nitrate, ferric nitrate and sodium hydroxide and mix and grind for 0.5 hours;

[0020] The reactant undergoes a solid-phase reaction at room temperature, changing from a white powder to a yellow-brown porridge paste reactant. After 30 minutes, the reaction is completed and a yellow-brown powder product is obtained;

[0021] After washing the powder with water to remove the by-product sodium nitrate, it is dried and heated at 400°C for 1 hour to obtain part of the desired product bismuth ferrite;

[0022] Then use concentrated nitric acid to dissolve unreacted raw materials in the product at a volume ratio of 1:1, wash with water, and dry to obtain the final product with a yield of 55.2%.

Embodiment 2

[0024] According to the molar ratio Bi:Fe:NaOH=2.5:1:5, weigh bismuth nitrate, ferric nitrate and sodium hydroxide and mix and grind for 1 hour;

[0025] The reactant undergoes a solid-phase reaction at room temperature, changing from a white powder to a yellow-brown porridge paste reactant. After 30 minutes, the reaction is completed and a yellow-brown powder product is obtained;

[0026] Wash the powder with water to remove the by-product sodium nitrate, dry it, and heat it at a temperature of 550°C for 3 hours to obtain part of the desired product bismuth ferrite;

[0027] Then use concentrated nitric acid to dissolve the unreacted raw materials in the product at a volume ratio of 1:1, wash with water, and dry to obtain all the final products, with a yield of 62.1%.

Embodiment 3

[0029] According to the molar ratio of Bi:Fe:NaOH=4:1:10, weigh bismuth nitrate, ferric nitrate and sodium hydroxide and mix and grind for 2 hours;

[0030] The reactant undergoes a solid-phase reaction at room temperature, changing from a white powder to a yellow-brown porridge paste reactant. After 30 minutes, the reaction is completed and a yellow-brown powder product is obtained;

[0031] The powder is washed with water to remove the by-product sodium nitrate, then dried, and heated at 700°C for 6 hours to obtain part of the desired product bismuth ferrite;

[0032] Then use concentrated nitric acid to dissolve unreacted raw materials in the product at a volume ratio of 1:1, wash with water, and dry to obtain all the final product bismuth ferrite, with a yield of 66.8%.

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Abstract

The invention relates to a method for preparing a bismuth ferrite material by a two-step solid-phase reaction, in particular to a method for preparing uniform bismuth ferrite particles at a relatively low temperature. The method comprises the following steps of: performing a solid-phase reaction on raw materials at room temperature so as to obtain a reactant with a large specific surface area, high reaction activity and small particle size; and heating the reactant at a relatively low temperature so as to obtain a bismuth ferrite product. Compared with the prior art, the method has the advantages that: the method has relatively low synthesis temperature, simple process and high efficiency, is low in cost, is easy to control and expand, and the like. The bismuth ferrite product obtained by the method has high purity, small particle size and uniform particles.

Description

Technical field [0001] The invention relates to a method for preparing bismuth ferrite using two-step solid phase reaction, and belongs to the field of inorganic materials. Background technique [0002] Bismuth Ferrite BiFeO 3 It is a typical multiferroic material with an antiferromagnetic Neel temperature (T N =380℃) and ferroelectric Curie temperature (T c =830℃), is one of the few single-phase multiferroic materials that have both ferroelectricity and parasitic weak ferromagnetism at room temperature. BiFeO 3 This special property of TM has important application prospects in emerging memory materials. As early as the 1960s, people have successfully prepared bismuth ferrite BiFeO 3 (BFO) bulk materials, but the temperature range for generating BFO single phase is quite narrow, and it is easy to produce impurity phases. Therefore, the preparation and research of single-phase BFO bulk materials have gone through a long and slow process. In 1997, Teowee, G et al. used the sol-gel...

Claims

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Application Information

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IPC IPC(8): C01G49/00
Inventor 徐金宝王磊贾殿赠
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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