Three-dimensional flower-ball-shaped lanthanum bismuth ferrite powder and preparation method thereof

A technology of lanthanum bismuth ferrite and three-dimensional flowers, which is applied in the field of material science, can solve the problems of narrow product purity and small specific surface area of ​​precursors, and achieve the effects of no environmental pollution, uniform morphology, and uniform grain dispersion

Active Publication Date: 2017-05-31
SHAANXI UNIV OF SCI & TECH
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  • Description
  • Claims
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Problems solved by technology

Among them, the powder prepared by the hydrothermal method has good dispersibility, high crystallinity, high product purity, narrow particle size distribution and controllable morphology, so the hydrothermal method was first used to synthesize square-shaped Bi 0.9 La 0.1 FeO 3 Powder precursor, but the specific surface area of ​​the precursor is small

Method used

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  • Three-dimensional flower-ball-shaped lanthanum bismuth ferrite powder and preparation method thereof
  • Three-dimensional flower-ball-shaped lanthanum bismuth ferrite powder and preparation method thereof
  • Three-dimensional flower-ball-shaped lanthanum bismuth ferrite powder and preparation method thereof

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preparation example Construction

[0033] A three-dimensional curd Bi 0.9 La 0.1 FeO 3 The preparation method of powder comprises the following steps:

[0034] Step 1: Preparation of cubic Bi by hydrothermal method 0.9 La 0.1 FeO 3 Powder: the molar ratio is 0.9:0.1:1, weigh Bi(NO 3 ) 3 ·5H 2 O, La(NO 3 ) 3 ·6H 2 O and 1mmol of Fe(NO 3 ) 3 9H 2 Add O into 10-15mL deionized water, add 0.5-1.5mL concentrated nitric acid (65%wt%) and magnetically stir until evenly mixed to obtain a mixed solution A; dropwise into the mixed solution A at a rate of 2-3 drops / second Add 35 to 45 mL of NaOH aqueous solution with a concentration of 1.5 to 2 mol / L, stir magnetically until uniform, and obtain a reddish-brown mixed solution B; move the mixed solution B to a polytetrafluoroethylene reactor and place it in a homogeneous reactor Seal it and carry out a homogeneous constant temperature hydrothermal reaction. The temperature of the constant temperature reaction is 190-210 ° C, and the reaction time is 6-12 hours....

Embodiment 1

[0039] A three-dimensional curd Bi 0.9 La 0.1 FeO 3 The preparation method of powder comprises the following steps:

[0040] (1) Preparation of square Bi by hydrothermal method 0.9 La 0.1 FeO 3 Powder: According to Bi 0.9 La 0.1 FeO 3 In the molar ratio, respectively weigh the Bi(NO 3 ) 3 ·5H 2 O, La(NO 3 ) 3 ·6H 2 O and 1mmol of Fe(NO 3 ) 3 9H 2 O was added to 15mL deionized water, 1.5mL of concentrated nitric acid (65%wt%) was added and magnetically stirred until uniformly mixed to obtain a mixed solution A; 40mL of 1.5mol / L NaOH solution was slowly added dropwise to the mixed solution A to obtain a red After the brown suspension B, continue to stir; pour the suspension B into a polytetrafluoroethylene reactor, place it in a homogeneous reactor and seal it, and perform a hydrothermal reaction with a reaction temperature of 190°C and a reaction time of 12 hours; After cooling down to room temperature, the precipitate was washed several times with absolute eth...

Embodiment 2

[0043] A three-dimensional curd Bi 0.9 La 0.1 FeO 3 The preparation method of powder comprises the following steps:

[0044] (1) Preparation of square Bi by hydrothermal method 0.9 La 0.1 FeO 3 Powder: According to Bi 0.9 La 0.1 FeO 3 In the molar ratio, respectively weigh the Bi(NO 3 ) 3 ·5H 2 O, La(NO 3 ) 3 ·6H 2 O and 1mmol of Fe(NO 3 ) 3 9H 2 O was added to 15mL deionized water, and 1.5mL of concentrated nitric acid (65%wt%) was added and magnetically stirred until uniformly mixed to obtain mixed solution A; 40mL of 2mol / L NaOH solution was slowly added dropwise to mixed solution A to obtain reddish-brown After adding the suspension B, continue to stir; pour the suspension B into a polytetrafluoroethylene reactor, place it in a homogeneous reactor and seal it, and perform a hydrothermal reaction with a reaction temperature of 210°C and a reaction time of 12 hours; the reaction is completed After cooling to room temperature, the precipitate was washed sever...

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Abstract

The invention discloses three-dimensional flower-ball-shaped lanthanum bismuth ferrite powder and a preparation method thereof. The preparation method comprises the steps of using Bi(NO3)3 5H2O, La(NO3)3 6H2O and Fe(NO3)3 9H2O as raw materials, preparing square-shaped Bi0.9La0.1FeO3 powder through a hydrothermal method, then processing the Bi0.9La0.1FeO3 powder through a one-step etching method, using N,N-dimethyl formamide as solvent and using reducing agent of hydrazine hydrate and complexing agent of methyl thioglycolate at the same time to prepare the three-dimensional flower-ball-shaped lanthanum bismuth ferrite powder. The specific surface area of the flower-ball-shaped Bi0.9La0.1FeO3 powder prepared through the preparation method disclosed by the invention is enlarged; meanwhile, the preparation method is simple, short in period, high in etching efficiency and free of environmental pollution; in addition, reaction is easy to control.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of material science, and in particular relates to a three-dimensional flower spherical lanthanum bismuth ferrite powder and a preparation method thereof. [0003] 【Background technique】 [0004] As a new type of functional material, multiferroic materials not only have non-single ferroic properties, but also have coupling synergies between different ferroic properties, so they have broad application prospects. BiFeO 3 As the only material so far that exhibits both ferroelectricity and magnetism above room temperature, BiFeO 3 The ferroelectric Curie temperature and the antiferromagnetic order temperature of the ferroelectric materials are much higher than room temperature, attracting many scientists to explore the synthesis of multiferroic materials and the research on the physical mechanism of their multiferroic properties. But so far BiFeO 3 However, many difficulties have been encountered in the research...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82Y30/00
CPCB82Y30/00C01G49/009C01P2002/72C01P2004/03C01P2004/32C01P2004/61C01P2006/12
Inventor 杨海波王倩高淑雅林营
Owner SHAANXI UNIV OF SCI & TECH
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