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Yttrium, europium and manganese codoped bismuth ferrite and preparation method thereof

A technology of bismuth ferrite and sum, which is applied in the field of functional material preparation technology, can solve the problems of large leakage current, large magnetism, and difficulty in preparing samples, etc., and achieve the effect of improving the performance of multiferroics

Inactive Publication Date: 2018-07-27
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although BFO has a high remanent polarization in theory, in the preparation process of pure bismuth ferrite material, bismuth element is easy to volatilize and part of Fe 3+ to Fe 2+ Transformation produces more oxygen vacancies, which makes its leakage current larger, difficult to polarize, and it is difficult to prepare samples with higher remanent polarization; in addition, the helical magnetic structure inside bismuth ferrite makes the magnetic moment locked, Cannot exhibit large magnetic properties, so practical applications are limited

Method used

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  • Yttrium, europium and manganese codoped bismuth ferrite and preparation method thereof
  • Yttrium, europium and manganese codoped bismuth ferrite and preparation method thereof
  • Yttrium, europium and manganese codoped bismuth ferrite and preparation method thereof

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Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0022] Step 1, select BiFeO 3 The amount of substance is 0.01mol, weigh 0.0677g Y 2 o 3 , 0.0528g Eu 2 o 3 , 2.1201g Bi 2 o 3 Add to 20mL nitric acid, corresponding to Y 2 o 3 、Eu 2 o 3 and Bi 2 o 3 The proportions of three elements Y, Eu and Bi are 6%, 3% and 91%, wherein the mass fraction of nitric acid is 65%, and stirred at 90°C until a clear solution is obtained.

[0023] Step 2, weigh 0.0284g MnO and 3.8784g Fe(NO 3 ) 3 9H 2 O, corresponding to MnO and Fe(NO 3 ) 3 9H 2 The proportions of Mn and Fe in O are 4% and 96%, and they are added to the solution prepared above. Fully heat and stir to obtain a precursor solution.

[0024] Step 3: Add 3.002g of tartaric acid (the same amount as the total amount of metal cations, specifically 0.02mol) and a small amount of deionized water to the obtained precursor solution, and continue stirring for 4 hours until xerogel is formed.

[0025] Step 4: Dry it in a drying oven to form a xerogel, pre-calcine the xerogel ...

specific Embodiment 2

[0027] Step 1, select BiFeO 3 The amount of substance is 0.01mol, weigh 0.079g Y 2 o 3 , 0.0528g Eu 2 o 3 , 2.0968g Bi 2 o 3 Add to 20mL nitric acid, corresponding to Y 2 o 3 、Eu 2 o 3 and Bi 2 o 3 The proportions of three elements Y, Eu and Bi are 7%, 3% and 90%, wherein the mass fraction of nitric acid is 65%, and stirred at 90°C until a clear solution is obtained.

[0028] Step 2, weigh 0.0213g MnO and 3.9188g Fe(NO 3 ) 3 9H 2 O, corresponding to MnO and Fe(NO 3 ) 3 9H 2 The proportions of Mn and Fe in O are 3% and 97%, which are added to the solution prepared above. Fully heat and stir to obtain a precursor solution.

[0029] Step 3: Add 3.002g of tartaric acid (the same amount as the total amount of metal cations, specifically 0.02mol) and a small amount of deionized water to the obtained precursor solution, and continue stirring for 4 hours until xerogel is formed.

[0030] Step 4: Dry it in a drying oven to form a xerogel, pre-calcine the xerogel at 2...

specific Embodiment 3

[0032] Step 1, select BiFeO 3 The amount of substance is 0.01mol, weigh 0.0903g Y 2 o 3 , 0.088g Eu 2 o 3 , 2.0269g Bi 2 o 3 Add to 20mL nitric acid, corresponding to Y 2 o 3 、Eu 2 o 3 and Bi 2 o 3The proportions of Y, Eu and Bi in the three elements are 8%, 5% and 87%, wherein the mass fraction of nitric acid is 65%, and stirred at 90°C until a clear solution is obtained.

[0033] Step 2, weigh 0.0355g MnO and 3.838g Fe(NO 3 ) 3 9H 2 O, corresponding to MnO and Fe(NO 3 ) 3 9H 2 The proportions of Mn and Fe in O are 5% and 95%, and they are added to the solution prepared above. Fully heat and stir to obtain a precursor solution.

[0034] Step 3: Add 3.002g of tartaric acid (the same amount as the total amount of metal cations, specifically 0.02mol) and a small amount of deionized water to the obtained precursor solution, and continue stirring for 4 hours until xerogel is formed.

[0035] Step 4: Dry it in a drying oven to form a xerogel, pre-calcine the xero...

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Abstract

The invention discloses a preparation method of yttrium, europium and manganese codoped bismuth ferrite. The method comprises the following steps of S01, weighing and taking Y2O3, Eu2O3 and Bi2O3 intonitric acid; performing stirring until a clear solution is obtained; S02, adding MnO and Fe(NO3)3.9H2O into the solution obtained in S01 according to the proportion of the quantity sum of three element substances of Y, Eu and Bi to the quantity sum of the two kinds of element substances of Mn and Fe to be 1:1; performing full and continuous stirring to obtain a precursor solution; S03, adding tartaric acid and deionized water into the precursor solution obtained in the S02; performing continuous stirring to form xerogel; S04, putting the xerogel obtained in the S03 in a drying box; performingpreroasting for 2h at 250 DEG C; then, performing sintering annealing for 2h under the condition of 550 DEG C. The invention also discloses the yttrium, europium and manganese codoped bismuth ferriteprepared by the preparation method. The yttrium, europium and manganese codoped bismuth ferrite and the preparation method of the yttrium, europium and manganese codoped bismuth ferrite provided by the invention have the advantages that the process is simple; the crystallinity degree is high; the current leakage density can be reduced.

Description

technical field [0001] The invention relates to a bismuth ferrite co-doped with yttrium, europium and manganese and a preparation method thereof, which belongs to the technical field of preparation technology of functional materials. Background technique [0002] Multiferroic materials refer to the properties of two or more of ferroelectricity, ferromagnetism and ferroelasticity at the same time. In reality, the most studied ferroelectric and ferromagnetic materials coexist, including antiferromagnetic materials. Electricity and antiferromagnetism. This coexistence of ferroelectricity and ferromagnetism makes multiferroic materials have a unique magnetoelectric coupling effect, that is, the electric field can induce magnetization, and the magnetic field can also induce polarization. Bismuth ferrite (BiFeO 3 , referred to as BFO) is the only single-phase multiferroic material with both ferroelectricity and antiferromagnetism at room temperature, because of its high ferroele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B01J13/00
CPCB01J13/0056C01G49/00
Inventor 李兴鳌王中超毛巍威王兴福张瑞
Owner NANJING UNIV OF POSTS & TELECOMM
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