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Bismuth ferrite based two-phase magnetic composite powder and preparation method thereof

A technology of composite powder and bismuth ferrite, which is applied in the field of material science, can solve the problems of small saturation magnetization and coercive field of bismuth ferrite powder, little research, limited application, etc., and is convenient for large-scale production and preparation. The method is simple and the effect of improving the comprehensive performance

Inactive Publication Date: 2015-05-06
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the small saturation magnetization and coercive field of single-phase bismuth ferrite powder, the magnetic properties are very weak, which limits its application in storage materials, semiconductor gas sensors and catalysts.
Nowadays, experimental research mainly focuses on single-phase bismuth ferrite powder, and there are few studies on two-phase bismuth ferrite-based composite powder.

Method used

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  • Bismuth ferrite based two-phase magnetic composite powder and preparation method thereof
  • Bismuth ferrite based two-phase magnetic composite powder and preparation method thereof
  • Bismuth ferrite based two-phase magnetic composite powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The general chemical formula Bi of a bismuth ferrite-based two-phase magnetic composite powder 2 Fe (4-x) co x o 9 , where x is the mass percentage of doped Co, x=0.01.

[0030] The preparation method of the above-mentioned bismuth ferrite-based two-phase magnetic composite powder comprises the following steps:

[0031] 1) According to the general chemical formula Bi 2 Fe (4-x) co x o 9 Analytical pure Bi(NO 3 ) 3 , Fe(NO 3 ) 3 9H 2 O and Co(NO 3 ) 2 9H 2After O is mixed, then add citric acid aqueous solution, then adopt ethylenediamine to adjust the pH value to be 6, at room temperature, under magnetic stirring, stir 2 hours to obtain sol; Wherein, the amount of the substance of the citric acid in the citric acid aqueous solution is Bi (NO 3 ) 3 , Fe(NO 3 ) 3 9H 2 O and Co(NO 3 ) 2 9H 2 3 times the amount of the total substance of the metal ion in O; the quality of water in the citric acid aqueous solution is Bi(NO 3 ) 3 , Fe(NO 3 ) 3 9H 2 O...

Embodiment 2

[0036] The general chemical formula Bi of a bismuth ferrite-based two-phase magnetic composite powder 2 Fe (4-x) co x o 9 , where x is the mass percentage of doped Co, x=0.02.

[0037] The preparation method of the above-mentioned bismuth ferrite-based two-phase magnetic composite powder comprises the following steps:

[0038] 1) According to the general chemical formula Bi 2 Fe (4-x) co x o 9 Analytical pure Bi(NO 3 ) 3 , Fe(NO 3 ) 3 9H 2 O and Co(NO 3 ) 2 9H 2 After O is mixed, then add citric acid aqueous solution, then adopt ethylenediamine to adjust the pH value to be 7, at room temperature under magnetic stirring, stir 3 hours to obtain sol; Wherein, the amount of the substance of the citric acid in the citric acid aqueous solution is Bi (NO 3 ) 3 , Fe(NO 3 ) 3 9H 2 O and Co(NO 3 ) 2 9H 2 4 times the amount of the total substance of the metal ion in O; the mass of water in the citric acid aqueous solution is Bi(NO 3 ) 3 , Fe(NO 3 ) 3 9H 2 O an...

Embodiment 3

[0043] The general chemical formula Bi of a bismuth ferrite-based two-phase magnetic composite powder 2 Fe (4-x) co x o 9 , where x is the mass percentage of doped Co, x=0.05.

[0044] The preparation method of the above-mentioned bismuth ferrite-based two-phase magnetic composite powder comprises the following steps:

[0045] 1) According to the general chemical formula Bi 2 Fe (4-x) co x o 9 Analytical pure Bi(NO 3 ) 3 , Fe(NO 3 ) 3 9H 2 O and Co(NO 3 ) 2 9H 2 After O is mixed, then add citric acid aqueous solution, then adopt ethylenediamine to adjust the pH value to be 6.5, at room temperature under magnetic stirring, stir 2.5 hours to obtain sol; Wherein, the amount of the substance of the citric acid in the citric acid aqueous solution is Bi (NO 3 ) 3 , Fe(NO 3 ) 3 9H 2 O and Co(NO 3 ) 2 9H 2 3.5 times of the total substance amount of metal ion in O; the mass of water in citric acid aqueous solution is Bi(NO 3 ) 3 , Fe(NO 3 ) 3 9H 2 O and Co(N...

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Abstract

The invention discloses bismuth ferrite based two-phase magnetic composite powder and a preparation method thereof. By mixing Bi(NO3)3, Fe(NO3)3.9H2O and Co(NO3)2.9H2O, adding an aqueous solution of citric acid, adjusting the pH value, stirring, drying, and calcinating at a temperature of 750-800 DEG C, so that the bismuth ferrite based two-phase magnetic composite powder is obtained. The preparation method is simple, easy to implement, and convenient for mass production. The composite powder prepared according to the invention both contains a Bi2Fe4O9 phase and a BiFeO3 phase; with the increasing of the content of cobalt ions, the content of BiFeO3 in the composite powder is increased, the saturation magnetization is increased from 0.097 emu / g to 1.78 emu / g, and the coercive field is increased from 122.27 oersteds to 3327.96 oersteds.

Description

technical field [0001] The invention belongs to the field of material science, and relates to a bismuth ferrite-based two-phase magnetic composite powder and a preparation method thereof. Background technique [0002] With the rapid development of mobile communication and computer technology, various electronic devices have become more highly integrated, multi-functional, miniaturized and responsive. Magnetic materials are an important branch of functional materials. Magnetic components made of magnetic materials have the functions of converting, transmitting, processing information, storing energy, and saving energy. They are widely used in energy, telecommunications, automatic control, communications, household appliances, Biology, medical and health, light industry, mineral processing, physical prospecting, military industry and other fields, especially in the field of information technology has become an indispensable part. Since the first discovery by French scientist ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82Y30/00
Inventor 杨海波刘淼林营朱建锋王芬
Owner SHAANXI UNIV OF SCI & TECH
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