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a multiferroic bi 0.96‑x sr 0.04 re x fe 0.94 mn 0.04 cr 0.02 o 3 ‑nife 2 o 4 Composite film and preparation method thereof

A composite film, multiferroic technology, applied in the field of materials, can solve problems such as weak ferromagnetic nature of hysteresis loops that limit practical applications, unable to obtain saturation, and large leakage conductance, so as to increase structural distortion and reduce leakage current density. , the effect of enhancing polarization

Active Publication Date: 2017-04-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pure phase BiFeO 3 There is a problem of large leakage conductance, which makes it impossible to obtain a saturated hysteresis loop and its weak ferromagnetic nature, thus limiting its practical application

Method used

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  • a multiferroic bi <sub>0.96‑x</sub> sr <sub>0.04</sub> re <sub>x</sub> fe <sub>0.94</sub> mn <sub>0.04</sub> cr <sub>0.02</sub> o <sub>3</sub> ‑nife <sub>2</sub> o <sub>4</sub> Composite film and preparation method thereof
  • a multiferroic bi <sub>0.96‑x</sub> sr <sub>0.04</sub> re <sub>x</sub> fe <sub>0.94</sub> mn <sub>0.04</sub> cr <sub>0.02</sub> o <sub>3</sub> ‑nife <sub>2</sub> o <sub>4</sub> Composite film and preparation method thereof
  • a multiferroic bi <sub>0.96‑x</sub> sr <sub>0.04</sub> re <sub>x</sub> fe <sub>0.94</sub> mn <sub>0.04</sub> cr <sub>0.02</sub> o <sub>3</sub> ‑nife <sub>2</sub> o <sub>4</sub> Composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1, dissolving ferric nitrate and nickel nitrate in a molar ratio of 1:2 in ethylene glycol methyl ether, stirring for 30 minutes, and then adding acetic anhydride to obtain a stable NiFe with a Fe ion concentration of 0.15mol / L 2 o 4 Precursor solution, the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;

[0036] Step 2, using bismuth nitrate, strontium nitrate, cerium nitrate, iron nitrate, manganese nitrate and chromium nitrate as raw materials (excessive bismuth nitrate, x=0.01, RE=Ce), molar ratio 0.99:0.04:0.01:0.94:0.04: 0.02 is dissolved in the mixed ethylene glycol methyl ether and acetic anhydride to obtain a stable Bi with a metal ion concentration of 0.15 mol / L 0.95 Ce 0.04 SM 0.01 Fe 0.94 mn 0.04 Cr 0.02 o 3 Precursor solution; wherein the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;

[0037] Step 3: Select the FTO / glass substrate as the substrate, place the cut FTO / glass substrate in deterg...

Embodiment 2

[0042] Step 1, dissolving ferric nitrate and nickel nitrate in a molar ratio of 1:2 in ethylene glycol methyl ether, stirring for 30 minutes, and then adding acetic anhydride to obtain a stable NiFe with a Fe ion concentration of 0.1mol / L 2 o 4 Precursor solution, the volume ratio of ethylene glycol methyl ether and acetic anhydride is 2.5:1;

[0043] Step 2, using bismuth nitrate, strontium nitrate, neodymium nitrate, ferric nitrate, manganese nitrate and chromium nitrate as raw materials (excessive bismuth nitrate, x=0.04, RE=Nd), molar ratio 0.96:0.04:0.04:0.94:0.04: 0.02 is dissolved in the mixed ethylene glycol methyl ether and acetic anhydride to obtain a stable Bi with a metal ion concentration of 0.003 mol / L 0.92 Sr 0.04 Nd 0.04 Fe 0.94 mn 0.04 Cr 0.02 o 3 Precursor solution; wherein the volume ratio of ethylene glycol methyl ether and acetic anhydride is 2.5:1;

[0044] Step 3: Select the FTO / glass substrate as the substrate, place the cut FTO / glass substrate ...

Embodiment 3

[0049] Step 1, dissolving ferric nitrate and nickel nitrate in a molar ratio of 1:2 in ethylene glycol methyl ether, stirring for 30 minutes, then adding acetic anhydride to obtain a stable NiFe with a Fe ion concentration of 0.25mol / L 2 o 4 Precursor solution, the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3.5:1;

[0050] Step 2, using bismuth nitrate, strontium nitrate, europium nitrate, iron nitrate, manganese nitrate and chromium nitrate as raw materials (bismuth nitrate is excessive, x=0.07, RE=Eu), molar ratio 0.93:0.04:0.07:0.94:0.04: 0.02 is dissolved in the mixed ethylene glycol methyl ether and acetic anhydride to obtain a stable Bi with a metal ion concentration of 0.3 mol / L 0.89 Sr 0.04 Eu 0.07 Fe 0.94 mn 0.04 Cr 0.02 o 3 Precursor solution; wherein the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3.5:1;

[0051] Step 3: Select the FTO / glass substrate as the substrate, place the cut FTO / glass substrate in de...

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Abstract

The invention discloses a multiferroic Bi0.96-xSr0.04RExFe0.94Mn0.04Cr0.02O3-NiFe2O4 composite film and a preparation method thereof. The composite film comprises a Bi0.96-xSr0.04RExFe0.94Mn0.04Cr0.02O3 crystalline state film and a NiFe2O4 crystalline state film which are compounded together. The preparation method comprises the following steps: respectively preparing a Bi0.96-xSr0.04RExFe0.94Mn0.04Cr0.02O3 precursor solution and a NiFe2O4 precursor solution; and spinning on a substrate to prepare a multilayer NiFe2O4 film, and spinning on the NiFe2O4 film to prepare a multilayer Bi0.96-xSr0.04RExFe0.94Mn0.04Cr0.02O3 film, thereby obtaining the target product. The equipment requirement is simple, the prepared film is high in uniformity, the doping amount is easy to control, and the ferroelectric properties and ferromagnetic properties of the film are greatly improved. Meanwhile, the leakage current density of the film is effectively reduced.

Description

technical field [0001] The invention belongs to the field of materials and relates to multiferroic Bi 0.96-x Sr 0.04 RE x Fe 0.94 mn 0.04 Cr 0.02 o 3 -NiFe 2 o 4 Composite membrane and method for its preparation. Background technique [0002] In recent years, BiFeO 3 As a new type of ferromagnetoelectric material, it has ferroelectricity and antiferromagnetism, accompanied by weak ferromagnetism, which has attracted great interest. BiFeO 3 Simple perovskite structure with trigonal twist, ferroelectric order (TC = 810°C) and G-type antiferromagnetic order (TN = 380°C) at room temperature, is one of the few single-phase multiferroic materials . BiFeO 3 Magnetoelectric coupling is widely used in information storage, spintronic devices, information storage, image display, pyroelectric effect, uncooled infrared focal plane array, etc. However, pure phase BiFeO 3 There is a problem of large leakage conductance, which makes it impossible to obtain a saturated hystere...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/34
CPCC03C17/3411
Inventor 谈国强刘文龙任慧君夏傲
Owner SHAANXI UNIV OF SCI & TECH
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