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Rare earth/alkaline earth metal and transition metal doped bismuth ferrite nano multiferroic material and preparation method thereof

A technology of multiferroic materials and transition metals, applied in nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems that BiFeO3 is difficult to apply, it is difficult to observe electric hysteresis loops, and magnetic hysteresis loops cannot be observed. Achieve excellent magnetic properties, excellent magnetic permittivity, easy to adjust the effect

Inactive Publication Date: 2010-06-16
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, BiFeO 3 The material is prone to valence fluctuations during the preparation process, resulting in a large leakage, making it difficult to observe the hysteresis loop
On the other hand, BiFeO 3 It has G-type antiferromagnetic order, and almost no hysteresis loop can be observed at room temperature
These two issues make BiFeO 3 Difficult to apply

Method used

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  • Rare earth/alkaline earth metal and transition metal doped bismuth ferrite nano multiferroic material and preparation method thereof
  • Rare earth/alkaline earth metal and transition metal doped bismuth ferrite nano multiferroic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Weigh a certain stoichiometric ratio of solid Fe(NO 3 ) 3 9H 2 O, Bi(NO 3 ) 3 ·5H 2 O and Dy 2 o 3 ; put Dy first 2 o 3 Dissolve in an appropriate amount of concentrated nitric acid, then add the reaction materials into 48ml of ethylene glycol, and mechanically stir at 80°C for 3 hours to form a wine-red complex solution of metal cations and ethylene glycol. The total molar concentration of metal cations in the solution is 0.4 mol / L, and the molar ratio of Bi:Dy:Fe is 0.8:0.2:1. After cooling at room temperature, pour it into a beaker and let it age for 2 hours, then put the aged solution into 160°C to evaporate and dry for 13 hours to obtain a dry gel, grind it into powder, and put it into a muffle furnace for heat treatment: first, heat it at 400 ℃ for three times, followed by calcination at 600 ℃ for 0.5h to obtain nano powder. The product is 34nm Bi 0.8 Dy 0.2 FeO 3 (A site doping) powder.

Embodiment 2

[0041] Weigh a certain stoichiometric ratio of solid Fe(NO 3 ) 3 9H 2 O, Bi(NO 3 ) 3 ·5H 2 O and Dy 2 o 3 ; put Dy first 2 o 3 Dissolve in an appropriate amount of concentrated nitric acid, then add the reaction materials into 48ml of ethylene glycol, and mechanically stir at 80°C for 3 hours to form a wine-red complex solution of metal cations and ethylene glycol. The total molar concentration of metal cations in the solution is 0.5 mol / L, and the molar ratio of Bi:Dy:Fe is 0.8:0.2:1. After cooling at room temperature, pour it into a beaker and let it age for 2 hours, then put the aged solution into 160°C to evaporate and dry for 13 hours to obtain a dry gel, grind it into powder, and put it into a muffle furnace for heat treatment: first, heat it at 400 ℃ for three times, followed by calcination at 600 ℃ for 0.5h to obtain nano powder. The product is 34nm Bi 0.8 Dy 0.2 FeO 3 (A site doping) powder.

Embodiment 3

[0043] Weigh a certain stoichiometric ratio of solid Fe(NO 3 ) 3 9H 2 O, Bi(NO 3 ) 3 ·5H 2 O and Dy 2 o 3 ; put Dy first 2 o 3 Dissolve in an appropriate amount of concentrated nitric acid, then add the reaction materials into 48ml of ethylene glycol, and mechanically stir at 80°C for 3 hours to form a wine-red complex solution of metal cations and ethylene glycol. The total molar concentration of metal cations in the solution is 0.4 mol / L, and the molar ratio of Bi:Dy:Fe is 0.8:0.2:1. After cooling at room temperature, pour it into a beaker and let it age for 2 hours, then put the aged solution into 160°C to evaporate and dry for 13 hours to obtain a dry gel, grind it into powder, and put it into a muffle furnace for heat treatment: first, heat it at 400 ℃ for three times, followed by calcination at 750 ℃ ​​for 0.5h to obtain nano powder. The product is 75nm Bi 0.8 Dy 0.2 FeO 3 (A site doping) powder.

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Abstract

The invention discloses a rare earth / alkaline earth metal and transition metal doped bismuth ferrite nano multiferroic material, and the chemical formula is Bi1-xRxFe1-yMyO3, wherein R is rare earth metal or alkaline earth metal, M is transition metal, x is not less than 0 and not more than 0.30, and y is not less than 0 and not more than 0.02. The preparation method has the steps of taking ferric nitrate, bismuth nitrate, rare earth / alkaline earth metal oxide or nitrate and transition metal nitrate as raw materials, taking ethylene glycol as a solvent, or using a specific additive for matching, mechanically stirring, forming even ethylene glycol solution, then aging at room temperature, evaporating and drying the obtained solution at the temperature of 160-250 DEG C, and carrying out thermal treatment at lower temperature for obtaining rare earth / alkaline earth metal A-site doped, transition metal B-site doped and rare earth / alkaline earth metal A-site and transition metal B-site co-doped bismuth ferrite nanoparticles of 20-100nm. The prepared nano multiferroic material has stable crystal quality, thereby having extensive application prospects in the fields of information storage, magnetic sensors of spin electronic devices, capacitor-inductor integrated devices and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic materials, and relates to a rare earth / alkaline earth metal (A site) and transition metal (B site) doped bismuth ferrite nano-multiferroic material and a preparation method thereof. Background technique [0002] With the continuous development of information technology and the requirements for miniaturization and multi-function of devices, people's research interest in multi-functional materials that combine ferroelectricity and magnetism is constantly increasing. Multiferroic materials not only have two or more ferromagnetic characteristics (ferroelectricity, ferroelasticity and ferromagnetism or antiferromagnetism) at the same time, but also can produce some new functions through ferromagnetic coupling synergy. This characteristic makes it extremely important in information storage, spintronic devices, magnetic sensors, and capacitive-inductive integrated devices. ...

Claims

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Application Information

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IPC IPC(8): C01G49/00B82B3/00
Inventor 姜继森钱方针杨惆
Owner EAST CHINA NORMAL UNIV
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