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a bi 1‑x re x feo 3 /cofe 2 o 4 Multiferroic composite film and preparation method thereof

A composite film and multiferroic technology, applied in the manufacture of inductors/transformers/magnets, the magnetism of inorganic materials, electrical components, etc., can solve the problems of large leakage current and weak magnetism, and achieve improved ferroelectric performance and high magnetic permeability rate, the effect of large magnetocrystalline anisotropy

Active Publication Date: 2017-05-17
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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  • a bi <sub>1‑x</sub> re <sub>x</sub> feo <sub>3</sub> /cofe <sub>2</sub> o <sub>4</sub> Multiferroic composite film and preparation method thereof
  • a bi <sub>1‑x</sub> re <sub>x</sub> feo <sub>3</sub> /cofe <sub>2</sub> o <sub>4</sub> Multiferroic composite film and preparation method thereof
  • a bi <sub>1‑x</sub> re <sub>x</sub> feo <sub>3</sub> /cofe <sub>2</sub> o <sub>4</sub> Multiferroic composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1, Co(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O was dissolved in the mixture of ethylene glycol methyl ether and acetic anhydride, and stirred for 2 hours to obtain 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;

[0040] Step 2, the Bi(NO 3 ) 3 ·5H 2 O, Ce(NO 3 ) 3 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O is dissolved in a mixture of ethylene glycol methyl ether and acetic anhydride at a molar ratio of 0.90:0.15:1 (RE=Ce, x=0.15, excess bismuth nitrate), and stirred for 2 hours to obtain a uniformly mixed Bi 0.85 Ce 0.15 FeO 3 Precursor, Bi 0.85 Ce 0.15 FeO 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;

[0041] Step 3, the prepared CoFe 2 o 4 Let the precursor solution stand for 24 hours, c...

Embodiment 2

[0046] Step 1, Co(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O was dissolved in the mixture of ethylene glycol methyl ether and acetic anhydride, and stirred for 2 hours to obtain 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;

[0047] Step 2, the Bi(NO 3 ) 3 ·5H 2 O, Tb(NO 3 ) 3 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O is dissolved in a mixture of ethylene glycol methyl ether and acetic anhydride at a molar ratio of 0.94:0.11:1 (RE=Tb, x=0.11, 5% excess bismuth nitrate), and stirred for 2 hours to obtain a uniformly mixed Bi 0.89 Tb 0.11 FeO 3 Precursor, Bi 0.89 Tb 0.11 FeO 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;

[0048] Step 3, the prepared CoFe 2 o 4 Let the precursor solution stand for 24 hour...

Embodiment 3

[0059] Step 1, Co(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O was dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride, stirred for 2 hours, and 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;

[0060] Step 2, the Bi(NO 3 ) 3 ·5H 2 O, Eu(NO 3 ) 3 ·6H 2 O and Fe(NO 3 ) 3 9H 2O is dissolved in a mixture of ethylene glycol methyl ether and acetic anhydride at a molar ratio of 0.95:0.1:1 (RE=Eu, x=0.1, excess bismuth nitrate), and stirred for 2 hours to obtain uniformly mixed Bi 0.9 Eu 0.1 FeO 3 Precursor, Bi 0.9 Eu 0.1 FeO 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;

[0061] Step 3, the prepared CoFe 2 o 4 Let the precursor solution stand for 24 hours, clean the ...

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Abstract

The invention provides a Bi1-xRExFeO3 / CoFe2O4 multiferroic composite membrane and a preparation method thereof. The composite membrane comprises a Bi1-xRExFeO3 crystalline state membrane and a CoFe2O4 crystalline state membrane which are combined together, wherein RE is Ce, Pr, Tb, Eu or Yb, x is equal to 0.05-0.15; in the preparation, Bi1-xRExFeO3 precursor solution and CoFe2O4 precursor solution are firstly prepared respectively; and then, multi-layer CoFe2O4 membrane is prepared by spinning on a substrate, and the multi-layer Bi1-xRExFeO3 membrane is prepared by spinning on the CoFe2O4 membrane, so the target product is obtained. The facility request is simple, the homogeneity of the prepared membrane is good, the chemical composition can be accurately controlled, the doping content is easily controlled, and the ferroelectric property and ferromagnetic property of the membrane are greatly improved, so the Bi1-xRExFeO3 / CoFe2O4 multiferroic composite membrane has high residual polarization value and residual magnetization value.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to a Bi 1-x RE x FeO 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 composites can have str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/10H01F41/02
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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