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Preparation method of low-leakage current Bi0.92Tb0.08Fe(1-x)CrxO3 film

A technology of bi0.92tb0.08fe1-xcrxo3 and leakage current, applied in the field of functional materials, can solve the problems of limited application, achieve the effects of improving multiferroic performance, precise and controllable chemical composition, and reducing leakage conduction

Active Publication Date: 2013-03-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Preparation method of low-leakage current Bi0.92Tb0.08Fe(1-x)CrxO3 film
  • Preparation method of low-leakage current Bi0.92Tb0.08Fe(1-x)CrxO3 film
  • Preparation method of low-leakage current Bi0.92Tb0.08Fe(1-x)CrxO3 film

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Experimental program
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Embodiment 1

[0021] Step 1: Add Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 ·9H 2 O, Tb(NO 3 ) 3 ·6H 2 O and Cr (NO 3 ) 3 ·9H 2 O mole ratio 0.97:0.99:0.08:0.01 is dissolved in the mixture of ethylene glycol methyl ether and acetic anhydride to form a mixed solution, and ethanolamine is added to the mixed solution to adjust the viscosity and the degree of complexation to obtain stable BiFeO 3 Precursor fluid, among them, BiFeO 3 The concentration of metal ions in the precursor solution is 0.3 mol / L, and the volume ratio of ethylene glycol methyl ether, acetic anhydride and ethanolamine is 3.5:1:0.2.

[0022] Step 2: Spin-coating and annealing layer by layer at 550°C for 5-l0min, and then natural cooling to room temperature, to obtain Tb and Cr co-doped crystalline Bi 0.92 Tb 0.08 Fe 0.99 Cr 0.01 O 3 film.

[0023] With Tb and Cr doped into BiFeO at the same time 3 , Thus fictional BiFeO 3 Oxygen vacancies in the film due to changes in the valence state of Fe during heat treatment. At the same time Tb and C...

Embodiment 2

[0025] Step 1: Add Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 ·9H 2 O, Tb(NO 3 ) 3 ·6H 2 O and Cr (NO 3 ) 3 ·9H 2 O mole ratio 0.97: 0.98: 0.08: 0.02 is dissolved in the mixture of ethylene glycol methyl ether and acetic anhydride to form a mixed solution, and ethanolamine is added to the mixed solution to adjust the viscosity and the degree of complexation to obtain a stable BiFeO 3 Precursor fluid, among them, BiFeO 3 The concentration of metal ions in the precursor solution is 0.3 mol / L, and the volume ratio of ethylene glycol methyl ether, acetic anhydride and ethanolamine is 3.5:1:0.2.

[0026] Step 2: Spin-coating and annealing layer by layer at 550°C for 5-10min, and then natural cooling to room temperature, to obtain Tb and Cr co-doped crystalline Bi 0.92 Tb 0.08 Fe 0.98 Cr 0.02 O 3 film.

[0027] With Tb and Cr doped into BiFeO at the same time 3 , Thus fictional BiFeO 3 Oxygen vacancies in the film due to changes in the valence state of Fe during heat treatment. At the same time Tb ...

Embodiment 3

[0029] Step 1: Add Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 ·9H 2 O, Tb(NO 3 ) 3 ·6H 2 O and Cr (NO 3 ) 3 ·9H 2 O molar ratio of 0.97:0.97:0.08:0.03 is dissolved in the mixture of ethylene glycol methyl ether and acetic anhydride to form a mixed solution. Ethanolamine is added to the mixed solution to adjust the viscosity and the degree of complexation to obtain stable BiFeO 3 Precursor fluid, among them, BiFeO 3 The concentration of metal ions in the precursor solution is 0.3 mol / L, and the volume ratio of ethylene glycol methyl ether, acetic anhydride and ethanolamine is 3.5:1:0.2.

[0030] Step 2: Spin-coating and annealing layer by layer at 550°C for 5-10min, and then natural cooling to room temperature, to obtain Tb and Cr co-doped crystalline Bi 0.92 Tb 0.08 Fe 0.97 Cr 0.03 O 3 film.

[0031] With Tb and Cr doped into BiFeO at the same time 3 , Thus fictional BiFeO 3 Oxygen vacancies in the film due to changes in the valence state of Fe during heat treatment. At the same time Tb and C...

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Abstract

The invention provides a preparation method of a low-leakage current Bi0.92Tb0.08Fe(1-x)CrxO3 film. The method comprises the following steps of: dissolving bismuth nitrate, ferric nitrate, terbium nitrate and chromic nitrate at a molar ratio of 0.97:(1-x):0.08:x into the mixed solution of ethylene glycol monomethyl ether and acetic anhydride to form a mixed solution; adding ethanolamine into the mixed solution to adjust the viscosity and the complexing degree to obtain a stable BiFeO3 precursor liquid; and preparing a Tb and Cr co-doped crystalline BiFeO3 film by a spin-coating method and layer-by-layer annealing technology. The film is a crystalline Bi0.92Tb0.08Fe0.99Cr0.01O3 film, wherein the leakage current density is still kept below 10<-4>A / cm<2> in a 150kv / cm test electric field. According to the method provided by the invention, the requirements on equipment are simple, the experimental conditions are easy to realize, the prepared film has good uniformity, and the leakage current of the film is reduced through the co-doping of Tb and Cr.

Description

Technical field [0001] The invention belongs to the field of functional materials and relates to the preparation of Tb and Cr co-doped low leakage current Bi on the surface of a functionalized FTO / glass substrate 0.92 Tb 0.08 Fe 1-x Cr x O 3 Film preparation method. Background technique [0002] BiFeO 3 It is one of the few single-phase multi-iron materials. It has a twisted perovskite structure (belonging to the R3c point group). It is formed by a cubic structure stretched along the (111) direction to form a rhombohedral structure that deviates from the ideal perovskite structure. It has both ferroelectric order and antiferromagnetic order at room temperature, due to the higher ferroelectric phase transition temperature (T C =1103K) and the magnetic phase transition temperature (T N =643K), it has a wide range of application prospects in magnetoelectric sensors, spintronic devices, memory, etc. and has attracted attention. [0003] BiFeO 3 The biggest problem with thin films is th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/624C04B35/40
Inventor 谈国强董国华
Owner SHAANXI UNIV OF SCI & TECH
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