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Laminated BiFe(0.97-x)Mn0.03TMxO3/CoFe2O4 multiferroic composite film and preparation method thereof

A technology of cofe2o4 and multiferroicity, applied in chemical instruments and methods, lamination, lamination devices, etc., can solve the problems of weak magnetism and large leakage current, achieve high magnetic permeability, improve ferroelectricity, and chemical Precise and controllable effect of components

Active Publication Date: 2015-04-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] How to fix BiFeO 3 Due to the two major problems of large leakage current and weak magnetism, multiferroic materials with excellent properties are obtained, which is the focus of current research on single-phase magnetoelectric multiferroic materials.

Method used

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  • Laminated BiFe(0.97-x)Mn0.03TMxO3/CoFe2O4 multiferroic composite film and preparation method thereof
  • Laminated BiFe(0.97-x)Mn0.03TMxO3/CoFe2O4 multiferroic composite film and preparation method thereof
  • Laminated BiFe(0.97-x)Mn0.03TMxO3/CoFe2O4 multiferroic composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Step 1: Add Co(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O is dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride in a molar ratio of 1:2, and stirred for 2 hours to obtain a uniformly mixed CoFe 2 o 4 Precursor, CoFe 2 o 4 The concentration of Co ions in the precursor solution is 0.1mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;

[0044]Step 2: Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O, C 4 h 6 MnO 4 4H 2 O and Cr(NO 3 ) 3 9H 2 O is dissolved in a mixture of ethylene glycol methyl ether and acetic anhydride at a molar ratio of 1.05:0.95:0.03:0.02 (TM=Cr, x=0.02, excess bismuth nitrate 5%), and stirred for 2 hours to obtain uniformly mixed BiFe 0.95 mn 0.03 Cr 0.02 o 3 Precursor, BiFe 0.95 mn 0.03 Cr 0.02 o 3 The total concentration of metal ions in the precursor solution is 0.3mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;

[0045]...

Embodiment 2

[0050] Step 1: Add Co(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O is dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride in a molar ratio of 1:2, and stirred for 2 hours to obtain a uniformly mixed CoFe 2 o 4 Precursor, CoFe 2 o 4 The concentration of Co ions in the precursor solution is 0.15mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;

[0051] Step 2: Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O, C 4 h 6 MnO 4 4H 2 O and Co(NO 3 ) 2 ·6H 2 O is dissolved in a mixture of ethylene glycol methyl ether and acetic anhydride at a molar ratio of 1.05:0.95:0.03:0.02 (TM=Co, x=0.02, excess bismuth nitrate 5%), and stirred for 2 hours to obtain a uniformly mixed BiFe 0.95 mn 0.03 co 0.02 o 3 Precursor, BiFe 0.95 mn 0.03 co 0.02 o 3 The total concentration of metal ions in the precursor solution is 0.3mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;

[...

Embodiment 3

[0057] Step 1: Add Co(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O is dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride in a molar ratio of 1:2, and stirred for 2 hours to obtain a uniformly mixed CoFe 2 o 4 Precursor, CoFe 2 o 4 The concentration of Co ions in the precursor solution is 0.2mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;

[0058] Step 2: Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O, C 4 h 6 MnO 4 4H 2 O and Cu(NO 3 ) 2 ·3H 2 O is dissolved in a mixture of ethylene glycol methyl ether and acetic anhydride at a molar ratio of 1.05:0.95:0.03:0.02 (TM=Cu, x=0.02, excess bismuth nitrate 5%), and stirred for 2 hours to obtain a uniformly mixed BiFe 0.95 mn 0.03 Cu 0.02 o 3 Precursor, BiFe 0.95mn 0.03 Cu 0.02 o 3 The total concentration of metal ions in the precursor solution is 0.3mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;

[00...

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Abstract

The invention provides a laminated BiFe(0.97-x)Mn0.03TMxO3 / CoFe2O4 multiferroic composite film and a preparation method thereof. The composite film comprises a BiFe(0.97-x)Mn0.03TMxO3 / CoFe2O4 crystallized film and a CoFe2O4 crystallized film which are compounded together. The preparation method comprises the following steps of firstly, preparing a BiFe(0.97-x)Mn0.03TMxO3 / CoFe2O4 precursor solution and a CoFe2O4 precursor solution respectively; and then carrying out spin coating on a substrate to prepare a multi-layer CoFe2O4 film, and then carrying out spin coating on the CoFe2O4 film so as to prepare a multi-layer BiFe(0.97-x)Mn0.03TMxO3 / CoFe2O4 film, thereby obtaining the target product. According to the invention, the equipment requirement is simple; the prepared film is good in uniformity; chemical components are accurate and controllable; the doped amount is easy to control; the ferroelectric properties and the ferromagnetic property of a film are improved greatly, so that the film has high residual polarization value and a residual magnetization value.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to a laminated BiFe 0.97-x mn 0.03 tm x o 3 / CoFe 2 o 4 Multiferroic composite film and its preparation method. Background technique [0002] Single-phase magnetoelectric multiferroic materials have not been applied in practice so far, mainly because the Curie temperature of most single-phase materials is low, and the magnetoelectric effect is only available at extremely low temperatures, and the magnetoelectric effect is very weak . Although single-phase BiFeO 3 Both the Curie temperature and the Neel temperature of the material are above room temperature, but due to the BiFeO 3 The helical magnetic structure makes BiFeO 3 It exhibits G-type antiferromagnetism, and only shows weak ferromagnetism under low electric field, and its small magnetoelectric coupling characteristics hinder its practical application in multiferroics. On the contrary, multiferroic magnetoelectric c...

Claims

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Application Information

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IPC IPC(8): B32B9/00
CPCB32B9/00B32B37/02
Inventor 谈国强罗洋洋董国华任慧君夏傲
Owner SHAANXI UNIV OF SCI & TECH
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