Preparation method of pure-phase bismuth ferrite

A technology of bismuth ferrite and powder, which is applied in the direction of chemical instruments and methods, iron compounds, nanotechnology for materials and surface science, etc., can solve the problems that hinder the application of bismuth ferrite materials, complicated process, pure phase bismuth ferrite Problems such as large leakage current have achieved significant technological progress, simple process flow, and easy-to-control reactions

Inactive Publication Date: 2017-02-08
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the above-mentioned technical problems in the prior art, the invention provides a kind of preparation method of pure-phase bismuth ferrite powder, the preparation method of described this pure-phase bismuth ferrite powder should solve the preparation of pure phase bismuth ferrite powder in the prior art. The process of phase bismuth ferrite powder is complicated, and the obtained pure phase bismuth ferrite has a large leakage current due to the existence of impurity phases, which hinders the technical problems of the application of bismuth ferrite materials

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  • Preparation method of pure-phase bismuth ferrite

Examples

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Embodiment 1

[0022] Weigh 40.4024g Fe(NO 3 ) 3 9H 2 O and 48.5102g Bi(NO 3 ) 3 ·5H 2 o

[0023] Dissolve in 1L of HNO with a concentration of 1mol / L 3 Prepare a precursor solution with a metal ion concentration of 0.2 mol / L in the solution, and slowly and evenly add the precursor solution dropwise to 200 mL of NH with a volume ratio of 1:2 under magnetic stirring. 3 ·H 2 O / NH 4 HCO 3 Mixed precipitant (NH 4 HCO 3 concentration is 0.1mol / L), when the pH value of the titration system is 9.5, continue to stir for 20 minutes, let stand and age for 16 hours, filter the precipitate obtained from the reaction, wash with deionized water until neutral, and then use absolute ethanol Wash 3 times, dry in a drying oven at 50°C to obtain the precursor powder, then place the precursor powder in a muffle furnace, heat up to 600°C at a rate of 10°C / min for calcination for 1 hour, and cool to obtain pure-phase bismuth ferrite Powder.

[0024] The XRD characterization figure of the pure-phase b...

Embodiment 2

[0027] Weigh 40.4024g Fe(NO 3 ) 3 9H 2 O and 48.5102g Bi(NO 3 ) 3 ·5H 2 o

[0028] Dissolve in 1L of HNO with a concentration of 1mol / L 3 Prepare a precursor solution with a metal ion concentration of 0.2 mol / L in the solution, and slowly and evenly add the precursor solution dropwise to 200 mL of NH with a volume ratio of 1:2 under magnetic stirring. 3 ·H 2 O / NH 4 HCO 3 Mixed precipitant (NH 4 HCO 3 concentration is 0.1mol / L), when the pH value of the titration system is 10, continue to stir for 20 minutes, let it stand for 20 hours, and filter the precipitate obtained from the reaction, wash it with deionized water until it is neutral, and then wash it with absolute ethanol Wash 3 times, dry in a drying oven at 50°C to obtain the precursor powder, then place the precursor powder in a muffle furnace, heat up to 600°C at a rate of 10°C / min for calcination for 2 hours, and cool to obtain pure-phase bismuth ferrite Powder.

[0029] The XRD characterization figure of...

Embodiment 3

[0032] Weigh 40.4024g Fe(NO 3 ) 3 9H 2 O and 48.5102g Bi(NO 3 ) 3 ·5H 2 o

[0033] Dissolve in 1L of HNO with a concentration of 1mol / L 3 Prepare a precursor solution with a metal ion concentration of 0.2 mol / L in the solution, and slowly and evenly add the precursor solution dropwise to 200 mL of NH with a volume ratio of 1:2 under magnetic stirring. 3 ·H 2 O / NH 4 HCO 3 Mixed precipitant (NH 4 HCO 3 Concentration is 0.1mol / L), when the pH value of the titration system is 9, continue to stir for 20 minutes, let stand and age for 24 hours, the precipitate obtained from the reaction is filtered, washed with deionized water until neutral, and then washed with absolute ethanol Wash twice, dry in a drying oven at 60°C to obtain the precursor powder, then place the precursor powder in a muffle furnace, heat up to 600°C at a rate of 10°C / min for calcination for 3 hours, and cool to obtain pure-phase bismuth ferrite Powder.

[0034] The XRD characterization figure of the ...

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Abstract

The invention provides a preparation method of pure-phase bismuth ferrite. The method comprises a step of preparing a precursor liquid. Fe(NO3)3.9H2O and Bi(NO3)3.5H2O are dissolved in a solvent to obtain the precursor liquid with the metal ion concentration being 0.2 mol/L. Ammonia water is mixed with a ammonium bicarbonate solution to obtain a precipitating agent. In magnetic stirring, the precursor liquid is uniformly added to a precipitating agent solution dropwise till the pH value of a titration final point is controlled in 9-10. After titration is completed, stirring is continuously carried out to obtain a precipitate. The precipitate is allowed to stand and age, filtration is carried out, and the obtained product is washed with deionized water and absolute ethyl alcohol and is dried to obtain precursor powder. The precursor powder is put in a muffle furnace, the temperature is raised for calcination, and the obtained product is cooled to obtain pure-phase bismuth ferrite powder. The preparation method and the equipment are simple, and the pure-phase bismuth ferrite can be prepared in a large amount at one time. The preparation method is free of organic solvent and is green and eco-friendly, and the pure-phase bismuth ferrite is complete in crystallization and uniform in powder size.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a bismuth ferrite powder, in particular to a preparation method of a pure-phase bismuth ferrite powder. Background technique [0002] Pure-phase bismuth ferrite is one of the very few multiferroic materials that have both ferroelectricity and antiferromagnetism at room temperature. It has broad application prospects and is also a research hotspot in recent years. However, it is difficult to prepare pure-phase bismuth ferrite, and the existence of impurity phases leads to large leakage current, which hinders the development and application of bismuth ferrite materials. In recent years, many scholars have prepared pure-phase bismuth ferrite powder by various methods, mainly including solid-phase sintering method, hydrothermal synthesis method, sol-gel method and chemical co-precipitation method. The reaction temperature of the solid phase method is high, the reproducibility is poor,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82Y30/00
CPCB82Y30/00C01G49/00C01P2002/72C01P2004/03C01P2004/62C01P2004/64
Inventor 王晓瑞王占勇金鸣林陈麒忠陈若潇
Owner SHANGHAI INST OF TECH
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