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A kind of three-dimensional flower-shaped bismuth ferrite powder and preparation method thereof

A three-dimensional flower-like, bismuth ferrite technology, applied in the field of material science, can solve problems such as performance limitation and small specific surface area, and achieve the effects of good crystallinity, increased specific surface area, and uniform grain dispersion.

Active Publication Date: 2018-04-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Bi with a single morphology such as nanoparticles, nanocubes, nanowires, and submicron rods 2 Fe 4 o 9 Most of the specific surface area is relatively small, and the performance in many aspects is limited

Method used

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  • A kind of three-dimensional flower-shaped bismuth ferrite powder and preparation method thereof
  • A kind of three-dimensional flower-shaped bismuth ferrite powder and preparation method thereof
  • A kind of three-dimensional flower-shaped bismuth ferrite powder and preparation method thereof

Examples

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preparation example Construction

[0031] A three-dimensional flower-like Bi 2 Fe 4 o 9 and preparation method thereof, comprising the following steps:

[0032] 1) According to Bi 2 Fe 4 o 9 The molar ratio in the weighed Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 0, measure 10~15mL water and 1~2mL concentrated nitric acid (65wt.%), magnetically stir after mixing, make it fully dissolve and obtain mixed solution A; In the aqueous solution, the amount of bismuth ions and iron ions is carried out in the whole solution with the original ratio for the next reaction.

[0033] 2) Add 45-50 mL of 10-12 mol / L NaOH solution dropwise at a rate of two drops per second to the mixed solution A to precipitate Bi 3+ and Fe 3+, after obtaining the reddish-brown suspension B, continue stirring; when the NaOH concentration is in the range of 10-12 mol / L, the flaky bismuth ferrite with higher purity and uniform distribution can be obtained.

[0034] 3) Pour the suspension B into a polytetrafluoroethylene reactor, place i...

Embodiment 1

[0043] A three-dimensional flower-like Bi 2 Fe 4 o 9 and preparation method thereof, comprising the following steps:

[0044] (1) According to Bi 2 Fe 4 o 9 In the molar ratio, respectively weigh the Bi(NO 3 ) 3 ·5H 2 O, 2mmol of Fe(NO 3 ) 3 9H 2 O, 10mL of water and 1mL of concentrated nitric acid (65wt.%), magnetically stirred after mixing, fully dissolved to obtain mixed solution A;

[0045] (2) Slowly add 45mL 10mol / L NaOH solution dropwise to the mixed solution A to obtain the reddish-brown suspension B, then continue to stir;

[0046] (3) Pour the suspension B into a polytetrafluoroethylene reactor for a homogeneous hydrothermal reaction at a reaction temperature of 180°C for 6 hours;

[0047] (4) After the reaction kettle was cooled to room temperature, the precipitate obtained after the reaction was washed with deionized water and absolute ethanol, and then dried in an oven at 60° C. for 12 hours to obtain bismuth ferrite powder;

[0048] (5) Mix 3 mg of b...

Embodiment 2

[0054] Change the reaction time of the corrosion process in step (7) to 30min, 40min, 50min, 60min, 90min in sequence, and other conditions are the same as in Example 1.

[0055] After testing, when the reaction time of the corrosion process is 30 minutes, it can be observed that the complete flower-shaped bismuth ferrite cannot be obtained, and a small amount of thick flake bismuth ferrite can still be observed, but it is still a pure phase of bismuth ferrite; When the reaction time of the process is 60min and 90min, the complete flower-shaped bismuth ferrite can be obtained and the nanosheets are thinner, but Bi 25 FeO 40 and Bi 2 o 3 and other miscellaneous phases, so they do not meet the requirements. When the reaction time of the corrosion process is 40min and 50min, the XRD and SEM results meet the requirements; when the reaction time of the corrosion process is 40min, the phase is still bismuth ferrite, and the thick flaky bismuth ferrite disappears completely. The ...

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Abstract

The invention discloses three-dimensional flower-shaped bismuth ferrite powder and a preparation method thereof. The preparation method comprises the following steps: taking Bi(nO3)3.5H2O and Fe(NO3)3.9H2O as starting materials, preparing blocky bismuth ferrite powder by adopting a hydrothermal method, then mixing the bismuth ferrite powder, a corrosive solvent, a reducing agent and a complex agent under the protective atmosphere, and obtaining three-dimensional porous bismuth ferrite flower balls by adopting a one-step corrosion method. According to the invention, a thick flaky Bi2Fe4O9 powder raw material is prepared by adopting the hydrothermal method, grains are uniform in size and shape and are better in dispersibility, a corrosion technology is adopted, preparation technological operation is simple, and the period is short; and the prepared flower-shaped bismuth ferrite has the diameter being about 1-2mu m, sizes are uniform, a specific surface area is relatively large due to a porous structure, and performances of all the aspects are respectively improved.

Description

【Technical field】 [0001] The invention belongs to the field of material science, and in particular relates to a three-dimensional flower-shaped bismuth ferrite powder and a preparation method thereof. 【Background technique】 [0002] Bismuth-iron compounds are a large family, including soft bismuthite type and perovskite type, which have attracted great attention due to their physical properties and scientific and technological applications. In recent years, it has been discovered that perovskite-type bismuth-iron compounds with an asymmetric structure have the properties of coexistence of ferroelectricity and magnetism. This phenomenon of coexistence of ferroelectricity and magnetism, that is, the multiferroic effect, not only has the opportunity to study basic physics . Bi 2 Fe 4 o 9 With two structural orders, it was found to be a good material for semiconductor gas sensors, and it is also a catalyst. Bi 2 Fe 4 o 9 It is a narrow bandgap semiconductor, which can ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00B82Y30/00
CPCB82Y30/00C01G49/00C01P2002/72C01P2004/03C01P2004/32C01P2004/61C01P2004/62C01P2006/12
Inventor 杨海波戴菁菁林营高淑雅
Owner SHAANXI UNIV OF SCI & TECH
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