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a multiferroic bi 0.98‑x sr 0.02 re x fe 0.97 mn 0.03 o 3 ‑cufe 2 o 4 Composite film and preparation method thereof

A technology of bi0.98-xsr0.02rexfe0.97mn0.03o3-cufe2o4, composite film, applied in the direction of coating, etc., can solve the weak ferromagnetic nature of the electric hysteresis loop that cannot be saturated, the decrease of remanent polarization, and the limitation of practical Application and other issues, to achieve the effect of excellent ferroelectricity and ferromagnetism, reduced content, and aggravated structural distortion

Active Publication Date: 2017-03-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And under the action of the electric field, the directional movement of oxygen vacancies also forms a leakage current, causing a decrease in the remanent polarization.
BiFeO 3 The large leakage current in the material makes it impossible to obtain a saturated hysteresis loop and its weak ferromagnetic nature, which limits the practical application of the material

Method used

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  • a multiferroic bi <sub>0.98‑x</sub> sr <sub>0.02</sub> re <sub>x</sub> fe <sub>0.97</sub> mn <sub>0.03</sub> o <sub>3</sub> ‑cufe <sub>2</sub> o <sub>4</sub> Composite film and preparation method thereof
  • a multiferroic bi <sub>0.98‑x</sub> sr <sub>0.02</sub> re <sub>x</sub> fe <sub>0.97</sub> mn <sub>0.03</sub> o <sub>3</sub> ‑cufe <sub>2</sub> o <sub>4</sub> Composite film and preparation method thereof
  • a multiferroic bi <sub>0.98‑x</sub> sr <sub>0.02</sub> re <sub>x</sub> fe <sub>0.97</sub> mn <sub>0.03</sub> o <sub>3</sub> ‑cufe <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. Dissolve ferric nitrate and copper nitrate in ethylene glycol methyl ether at a molar ratio of 1:2, stir for 30 minutes, and then add acetic anhydride to obtain a stable CuFe with a Cu ion concentration of 0.15 mol / L 2 O 4 Precursor fluid, CuFe 2 O 4 The volume ratio of ethylene glycol methyl ether and acetic anhydride in the precursor solution is 3:1;

[0036] Step 2. The molar ratio is 1.03:0.02:0.97:0.03. Dissolve bismuth nitrate, strontium nitrate, ferric nitrate and manganese nitrate in a solvent (x=0, 5% excess bismuth nitrate) to obtain a total concentration of metal ions of 0.25 mol / L of stable Bi 0.98 Sr 0.02 Fe 0.97 Mn 0.03 O 3 Precursor solution; the solvent is a mixture of ethylene glycol methyl ether and acetic anhydride with a volume ratio of 3:1;

[0037] Step 3. Choose the FTO / glass substrate as the substrate, and place the cut FTO / glass substrate in detergent, acetone, and ethanol in order for ultrasonic cleaning. After each ultrasonic cleaning for 10...

Embodiment 2

[0042] Step 1. Dissolve ferric nitrate and copper nitrate in ethylene glycol methyl ether at a molar ratio of 1:2, stir for 30 minutes, and then add acetic anhydride to obtain a stable CuFe with a Cu ion concentration of 0.25 mol / L 2 O 4 Precursor fluid, CuFe 2 O 4 The volume ratio of ethylene glycol methyl ether and acetic anhydride in the precursor solution is 2.5:1;

[0043] Step 2. The molar ratio is 1:0.02:0.03:0.97:0.03. Dissolve bismuth nitrate, strontium nitrate, cerium nitrate, iron nitrate and manganese nitrate in a solvent (RE=Ce, x=0.03, excess bismuth nitrate 5%) , To obtain a stable Bi with a total concentration of metal ions of 0.35mol / L 0.95 Sr 0.02 Ce 0.03 Fe 0.97 Mn 0.03 O 3 Precursor solution; the solvent is a mixture of ethylene glycol methyl ether and acetic anhydride with a volume ratio of 2.5:1;

[0044] Step 3. Choose the FTO / glass substrate as the substrate, and place the cut FTO / glass substrate in detergent, acetone, and ethanol in order for ultrasonic clea...

Embodiment 3

[0049] Step 1. Dissolve ferric nitrate and copper nitrate in ethylene glycol methyl ether at a molar ratio of 1:2, stir for 30 minutes, and then add acetic anhydride to obtain stable CuFe with a Cu ion concentration of 0.22mol / L 2 O 4 Precursor fluid, CuFe 2 O 4 The volume ratio of ethylene glycol methyl ether and acetic anhydride in the precursor solution is 3.5:1;

[0050] Step 2. The molar ratio is 0.98:0.02:0.05:0.97:0.03. Dissolve bismuth nitrate, strontium nitrate, neodymium nitrate, iron nitrate and manganese nitrate in a solvent (RE=Nd, x=0.05, excess 5% bismuth nitrate) , To obtain a stable Bi with a total concentration of metal ions of 0.28mol / L 0.93 Sr 0.02 Nd 0.05 Fe 0.97 Mn 0.03 O 3 Precursor solution; the solvent is a mixture of ethylene glycol methyl ether and acetic anhydride with a volume ratio of 3.5:1;

[0051] Step 3. Choose the FTO / glass substrate as the substrate, and place the cut FTO / glass substrate in detergent, acetone, and ethanol in order for ultrasonic c...

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Abstract

The invention discloses a multiferroic Bi(0.98-x)Sr0.02RExFe0.97Mn0.03O3-CuFe2O4 composite film and a preparation method thereof. The composite film comprises Bi(0.98-x)Sr0.02RExFe0.97Mn0.03O3 crystal films and CuFe2O4 crystal films which are composited together. The preparation method comprises the following steps: firstly, preparing a Bi(0.98-x)Sr0.02RExFe0.97Mn0.03O3 precursor solution and a CuFe2O4 precursor solution respectively; secondly, preparing multiple layers of CuFe2O4 films on a substrate by spin coating, and preparing multiple layers of Bi(0.98-x)Sr0.02RExFe0.97Mn0.03O3 films on the CuFe2O4 films by spin coating to obtain a target product. The equipment requirement is simple, the uniformity of the prepared film is high, the doping amount is easy to control, the ferroelectric and ferromagnetic properties of the film are improved, and the leakage current density of the film is effectively reduced.

Description

Technical field [0001] The invention belongs to the field of functional materials and relates to multiferroic Bi 0.98-x Sr 0.02 RE x Fe 0.97 Mn 0.03 O 3 -CuFe 2 O 4 Composite membrane and preparation method thereof. Background technique [0002] BiFeO 3 It is a typical single-phase multiferroic perovskite material, which has ferroelectricity at room temperature (T C ~1103k) and ferromagnetic (T N ~640k). As BiFeO 3 The material has a magnetoelectric coupling effect. In recent years, a worldwide research boom of single-phase magnetoelectric materials has been formed. With the development of microelectronics, optoelectronics and sensors, the requirements for material properties are getting higher and higher. Ferroelectric thin films have become widely applicable due to their good ferroelectric, piezoelectric, dielectric, and pyroelectric properties. It is an important functional material in the fields of microelectronics, optoelectronics, integrated optics, and microelectronic mec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/34
CPCC03C17/3405C03C2217/70C03C2218/116
Inventor 谈国强晏霞任慧君夏傲
Owner SHAANXI UNIV OF SCI & TECH
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