Bismuth ferrite powder and preparation method thereof

A technology of bismuth ferrite and powder, which is applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of not showing ferromagnetism, and achieve the effect of good ferromagnetic performance, simple equipment, and high purity

Inactive Publication Date: 2018-11-13
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the unique helical magnetic moment arrangement, BiFeO 3 Macroscopically does not show ferromagnetism

Method used

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  • Bismuth ferrite powder and preparation method thereof
  • Bismuth ferrite powder and preparation method thereof
  • Bismuth ferrite powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of bismuth ferrite powder is made of BiFeO 3 The crystalline particles embedded in the amorphous structure of BiFeO 3 form.

[0031] The preparation method of this bismuth ferrite powder, comprises the steps:

[0032] (1) Take 0.5mmol Bi(NO 3 ) 3 ·5H 2 O and 0.5mmol Fe(NO 3 ) 3 9H 2 O, 8% SDS in water containing 0.6 mmol of SDS, 1 ml concentrated HNO 3 (mass fraction concentration ≥ 68%), add distilled water and mix to form an 8ml solution;

[0033] (2) Add ammoniacal liquor dropwise to the mixed solution obtained in step (1), and keep stirring until the pH value of the solution is 9, leave to stand for stratification, and remove the lower layer of precipitation;

[0034] (3) repeatedly washing and centrifuging the precipitate obtained in step (2) with deionized water to obtain a reaction precipitate;

[0035] (4) Add the precipitate obtained in step (3) into 16ml 10mol / L KOH aqueous solution, stir for 20min and mix well;

[0036] (5) Move the mixed so...

Embodiment 2

[0039] A kind of bismuth ferrite powder is made of BiFeO 3 The crystalline particles embedded in the amorphous structure of BiFeO 3 formed where the BiFeO 3 The crystal particle diameter is 5-20nm.

[0040] The preparation method of this bismuth ferrite powder, comprises the steps:

[0041] (1) Take 0.5mmol Bi(NO 3 ) 3 ·5H 2 O and 0.5mmol Fe(NO 3 ) 3 9H 2 O, 12% SDS in water containing 0.65 mmol of SDS, 0.9 ml concentrated HNO 3 (mass fraction concentration ≥ 68%), add distilled water and mix to form a 10.8ml solution;

[0042] (2) Add ammoniacal liquor dropwise to the mixed solution obtained in step (1), and keep stirring until the pH value of the solution is 10, leave to stand for stratification, and remove the lower layer of precipitation;

[0043] (3) repeatedly washing and centrifuging the precipitate obtained in step (2) with deionized water to obtain a reaction precipitate;

[0044] (4) Add the precipitate obtained in step (3) into 16.2ml 18mol / L KOH aqueous so...

Embodiment 3

[0048] A kind of bismuth ferrite powder is made of BiFeO 3 The crystalline particles embedded in the amorphous structure of BiFeO 3 formed where the BiFeO 3 The crystal particle diameter is 5-20nm.

[0049] The preparation method of this bismuth ferrite powder, comprises the steps:

[0050] (1) Take 0.5mmol Bi(NO 3 ) 3 ·5H 2 O and 0.5mmol Fe(NO 3 ) 3 9H 2 O, 10% SDS in water containing 0.6 mmol of SDS, 1 ml concentrated HNO 3 (mass fraction concentration ≥ 68%), add distilled water and mix to form a 10ml solution;

[0051] (2) Add ammoniacal liquor dropwise to the mixed solution obtained in step (1), and keep stirring until the pH value of the solution is 9.5, leave to stand for stratification, and remove the lower layer of precipitation;

[0052] (3) repeatedly washing and centrifuging the precipitate obtained in step (2) with deionized water to obtain a reaction precipitate;

[0053] (4) Add the precipitate obtained in step (3) into 18ml 12mol / L KOH aqueous soluti...

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Abstract

The invention discloses bismuth ferrite powder and a preparation method thereof. the bismuth ferrite powder is formed by embedding BiFeO3 crystalline particles into BiFeO3 adopting a non-crystalline structure; the BiFeO3 crystalline particles have the diameter of 5-20nm; during preparation, with Bi(NO3)3 or hydrate thereof and Fe(NO3)3 or hydrate thereof as raw materials, the reaction condition and solution concentration are controlled and the BiFeO3 powder is hydrothermally prepared, so that synthesis of the BiFeO3 powder through embedment of the crystalline particles into the non-crystallinestructure is achieved; in addition, the preparation method has the characteristics of no environment pollution, convenient operation, simple equipment, low cost, strong practicability and convenientpopularization and application; the BiFeO3 powder has good ferromagnetic performance, and has a very wide application prospect in the field of sensors, spintronic devices and multifunctional storage.

Description

technical field [0001] The invention belongs to the technical field of multiferroic materials, and in particular relates to a bismuth ferrite powder and a preparation method thereof. Background technique [0002] Multiferroic materials are materials with multiple ferroic properties at the same time. They have multiple advantages in terms of basic theoretical research and future technology applications, and are highly valued by researchers from all over the world. Bismuth ferrite (BiFeO 3 ) is currently the only single-phase multiferroic material that exhibits multiferroicity at room temperature, and has both G-type antiferromagnetic order and ferroelectric order. Fields such as optional electronic devices have broad application prospects. In addition, BiFeO 3 It also has special optical properties and has potential application value in the fields of photocatalysis and optoelectronics. [0003] Due to the unique helical magnetic moment arrangement, BiFeO 3 Macroscopicall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
CPCC01G49/00C01P2002/72C01P2004/04C01P2006/42
Inventor 吴蕾李金生王晓强李明亚
Owner 东北大学秦皇岛分校
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