Method for preparing bismuth ferrite powder by solvothermal method

A solvothermal method, bismuth ferrite technology, applied in chemical instruments and methods, iron compounds, sustainable manufacturing/processing, etc., can solve the problem of high energy consumption, achieve the effects of simple equipment, good crystallization, and reduced production costs

Inactive Publication Date: 2012-12-19
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Literature "Lei Zhang, Xiao-Feng Cao, Ying-Li Ma, Xue-Tai Chen, Zi-Ling Xue, Polymer-directed synthesis and magnetic property of nanoparticles-assembled BiFeO 3 microrods.Journal of Solid State Chemistry, 2010, 183, 1761-1766" discloses a solvothermal method for preparing BiFeO 3 method, the reaction solvent is a mixture of absolute ethanol and PVP, and a pure phase of BiFeO composed of nanoparticles is prepared 3 Micro rods, but the preparation temperature is up to 180°C, and the energy consumption is high
Literature "Soumen Das, Soumen Basu, Solvothermal synthesis of Nano-to-submicrometer sized BiFeO 3 andBi-Fe-Oxides with various morphologies,

Method used

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  • Method for preparing bismuth ferrite powder by solvothermal method
  • Method for preparing bismuth ferrite powder by solvothermal method
  • Method for preparing bismuth ferrite powder by solvothermal method

Examples

Experimental program
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Embodiment 1

[0027] Weigh 5mmol of analytically pure Fe(NO 3 ) 3 9H 2 O and 5mmol Bi(NO 3 ) 3 ·5H 2 O, and dissolve it in 100ml of 10% nitric acid solution, and stir it magnetically for 0.5h to form a uniform mother salt solution; slowly add 40ml of 10mol / L KOH solution dropwise to the mother salt solution, and the titration speed 4.5mL / min, and magnetically stirred for 0.5h to obtain a precipitate, and then the precipitate was repeatedly washed with deionized water to neutrality, and dried in an oven at 80°C to obtain a hydrothermal reaction precursor; the hydrothermal reaction precursor Put it into a hydrothermal kettle, add a mixture of 40mL water and 30mL ethanol as a solvent, and 4mol / L KOH as a mineralizer, and the filling degree is 80%. Seal the reaction kettle, place the reaction kettle in an oven at 120°C, take out the product in the reaction kettle after reacting for 16 hours, filter the precipitate, wash it, and dry it in an oven at 80°C to obtain bismuth ferrite powder.

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Embodiment 2

[0032] Weigh 6mmol of analytically pure Fe(NO 3 ) 3 9H 2 O and 6mmol Bi(NO 3 ) 3 ·5H 2O, and dissolve it in 100ml of 8% nitric acid solution, and stir it magnetically for 0.5h to form a uniform mother salt solution; slowly add 40ml of 8mol / L KOH solution dropwise to the mother salt solution, and the titration speed 2mL / min, and magnetically stirred for 0.5h to obtain a precipitate, and then the precipitate was repeatedly washed with deionized water to neutrality, and dried in an oven at 80°C to obtain a hydrothermal reaction precursor; the hydrothermal reaction precursor was put into Put it into a hydrothermal kettle, and add a mixture of 30mL water and 40mL ethanol as a solvent, and 10mol / L KOH as a mineralizer, and the filling degree is 75%. Seal the reaction kettle, put the reaction kettle in an oven at 130°C, take out the product in the reaction kettle after reacting for 16 hours, filter the precipitate, wash it, and dry it in an oven at 80°C to obtain bismuth ferrite...

Embodiment 3

[0034] Weigh 8mmol of analytically pure Fe(NO 3 ) 3 9H 2 O and 8mmol Bi(NO 3 ) 3 ·5H 2 O, and dissolve it in 100ml of 9% nitric acid solution, and stir it magnetically for 0.5h to form a uniform mother salt solution; slowly add 40ml of 9mol / L KOH solution dropwise to the mother salt solution, and the titration speed The temperature was 4mL / min, and magnetically stirred for 0.5h to obtain a precipitate, and then the precipitate was repeatedly washed with deionized water to neutrality, and dried in an oven at 80°C to obtain a hydrothermal reaction precursor; the hydrothermal reaction precursor was put into Put it into a hydrothermal kettle, and add a mixture of 35mL water and 35mL ethanol as a solvent, and 8mol / L KOH as a mineralizer, and the filling degree is 70%. Seal the reaction kettle, place the reaction kettle in an oven at 125°C, take out the product in the reaction kettle after reacting for 16 hours, filter the precipitate, wash it, and dry it in an oven at 80°C to ...

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Abstract

The invention discloses a method for preparing bismuth ferrite powder by a solvothermal method. The method comprises the following steps of: (1) weighing and analyzing pure Fe(NO3)3.9H2O and Bi(NO3)3.5H2O according to a molar ratio of 1:1, dissolving the Fe(NO3)3.9H2O and the Bi(NO3)3.5H2O into a nitric acid solution, and stirring through magnetic force to prepare a uniform mother salt solution; (2) dropping an KOH solution into the mother salt solution, stirring through the magnetic force to obtain a precipitate, and washing and drying the precipitate to obtain a hydrothermal reaction precursor; (3) putting the hydrothermal reaction precursor into a hydrothermal kettle, adding a mixture of absolute ethyl alcohol and water as a solvent, and taking the KOH as a mineralizing agent; (4) sealing the reaction kettle, putting the reaction kettle into an oven with a temperature of 120-130 DEG C, taking out a product in the reaction kettle after reacting, and filtering to obtain a precipitate; and washing and drying the precipitate to obtain the bismuth ferrite powder. The method for preparing the bismuth ferrite powder by the solvothermal method has the advantages of low preparation temperature, energy saving, good bismuth ferrite crystallization and simple process control and apparatus required by synthesis.

Description

technical field [0001] The invention relates to a preparation method of bismuth ferrite powder, in particular to a method for preparing bismuth ferrite powder by a solvothermal method. Background technique [0002] Due to their simultaneous ferroelectricity and ferromagnetism or ferroelasticity, multiferroic materials have broad application prospects in information storage devices, spintronic devices, and sensors. As a representative single-phase multiferroic material, bismuth ferrite (BiFeO 3 ) has a high ferroelectric Curie temperature (T C ≈820℃) and high antiferromagnetic Neel temperature (T N ≈370℃), is one of the very few materials with multiferroic properties at room temperature, and thus has been extensively studied in recent years. However, the large leakage current due to the presence of impurities in the second phase severely hinders the BiFeO 3 application of materials. [0003] Currently synthesized BiFeO 3 The methods of powder mainly include chemical met...

Claims

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Application Information

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IPC IPC(8): C01G49/00
CPCY02P20/10
Inventor 陈志武巫永鹏卢振亚
Owner SOUTH CHINA UNIV OF TECH
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