Method for preparing Tb/Cr-codoped high-remanent-polarization BiFeO3 film by sol-gel process

A sol-gel method and polarization strength technology, applied in the field of functional materials, can solve problems such as limited application, and achieve the effects of good uniformity, easy experimental conditions, and good ferroelectric stability.

Active Publication Date: 2013-04-24
盐城青墩津邦水务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for preparing Tb/Cr-codoped high-remanent-polarization BiFeO3 film by sol-gel process
  • Method for preparing Tb/Cr-codoped high-remanent-polarization BiFeO3 film by sol-gel process
  • Method for preparing Tb/Cr-codoped high-remanent-polarization BiFeO3 film by sol-gel process

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Embodiment 1

[0024] Step 1: Bi(NO 3 ) 3 ·5H 2 O (excess 5%), Fe(NO 3 ) 3 9H 2 O, Tb(NO 3 ) 3 ·6H 2 O and Cr(NO 3 ) 3 9H 2 O is dissolved in a mixed solution of ethylene glycol methyl ether and acetic anhydride (volume ratio 3:1 to 4:1) at a molar ratio of 0.94:0.99:0.11:0.01 to form a mixed solution, and ethanolamine is added to the mixed solution to adjust the viscosity and degree of complexation to obtain stable BiFeO 3 The precursor liquid, the total metal ion concentration in the precursor liquid is 0.3mol / L.

[0025] Step 2: Spin coating and layer-by-layer annealing at 550°C on the FTO substrate (dry the dry film after uniform coating and anneal quickly at 550°C for 7-12 minutes, then cool to room temperature with the furnace, repeat the above process to obtain the required thick film) to obtain Tb and Cr co-doped crystalline BiFeO 3 film. With simultaneous incorporation of Tb and Cr into BiFeO 3 , making Bi 0.89 Tb 0.11 Fe 0.99 Cr 0.01 o 3 The saturated remnant po...

Embodiment 2

[0027] Step 1: Bi(NO 3 ) 3 ·5H 2 O (excess 5%), Fe(NO 3 ) 3 9H 2 O, Tb(NO 3 ) 3 ·6H 2 O and Cr(NO 3 ) 3 9H 2 O is dissolved in a mixture of ethylene glycol methyl ether and acetic anhydride (volume ratio 3:1 to 4:1) in a molar ratio of 0.94:0.98:0.11:0.02 to form a mixed solution, and ethanolamine is added to the mixed solution to adjust the viscosity and degree of complexation to obtain stable BiFeO 3 The precursor liquid, the total metal ion concentration in the precursor liquid is 0.3mol / L.

[0028] Step 2: Spin-coating and layer-by-layer rapid annealing at 550°C on the FTO substrate to obtain Tb and Cr co-doped BiFeO 3 film. With simultaneous incorporation of Tb and Cr into BiFeO 3 , making Bi 089 Tb 0.11 Fe0.98 Cr 0.02 o 3 thin film, making BiFeO 3 The crystal lattice is severely distorted, and the original rhomboid structure is transformed into a pseudo-tetragonal structure, so that the film is in a low-energy state where multiple phases coexist. The ...

Embodiment 3

[0030] Step 1: Bi(NO 3 ) 3 ·5H 2 O (excess 5%), Fe(NO 3 ) 3 9H 2 O, Tb(NO 3 ) 3 ·6H 2 O and Cr(NO 3 ) 3 9H 2 O is dissolved in a mixture of ethylene glycol methyl ether and acetic anhydride (volume ratio 3:1 to 4:1) in a molar ratio of 0.94:0.97:0.11:0.03 to form a mixed solution, and ethanolamine is added to the mixed solution to adjust the viscosity and degree of complexation to obtain stable BiFeO 3 The precursor liquid, the total metal ion concentration in the precursor liquid is 0.3mol / L.

[0031] Step 2: Spin-coating and layer-by-layer rapid annealing at 550°C on the FTO substrate to obtain Tb and Cr co-doped BiFeO 3 film. With simultaneous incorporation of Tb and Cr into BiFeO 3 , making Bi 0.89 Tb 0.11 Fe 0.97 Cr 0.03 o 3 film.

[0032] Determination of BiFeO by XRD 3 Phase composition and structure of thin films, determined by FE-SEM for BiFeO 3 Microscopic morphology of thin film, BiFeO was tested with TF2000 ferroelectric analyzer 3 Ferroelect...

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Abstract

The invention provides a method for preparing a Tb/Cr-codoped high-remanent-polarization BiFeO3 film by a sol-gel process, which comprises the following steps: dissolving bismuth nitrate, ferric nitrate, terbium nitrate and chromic nitrate in a mol ratio of 0.94:(1-x):0.11:x in a mixed solution of ethylene glycol monomethyl ether and acetic anhydride, and adding ethanolamine to obtain a stable BiFeO3 precursor solution, wherein the total metal ion concentration in the BiFeO3 precursor solution is 0.3 mol/L, and x=0.01-0.03; and carrying out spin coating and layer-by-layer annealing to obtain the Tb/Cr-codoped crystalline BiFeO3 film. The facility requests are simple, the experimental conditions are each to achieve, the film has favorable uniformity, the doping amounts of Tb and Cr can be accurately controlled, and the crystal structure can be adjusted by codoping to greatly enhance the ferroelectric properties of the film, so that the saturated remanent polarization of the film can reach 80.8 mu C/cm<2>.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to the preparation of Tb and Cr co-doped BiFeO with high remnant polarization intensity on the surface of a functionalized FTO / glass substrate 3 thin film method. Background technique [0002] BiFeO 3 It is one of the few single-phase multiferroic materials with a twisted perovskite structure (belonging to the R3c point group), a rhomboid structure that deviates from the ideal perovskite structure formed by stretching the cubic structure along the (111) direction, It has both ferroelectric order and antiferromagnetic order at room temperature, due to the high ferroelectric phase transition temperature (T C =1103K) and 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] Currently used to prepare BiFeO 3 There are many thin film methods, ...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/624
Inventor 谈国强董国华
Owner 盐城青墩津邦水务有限公司
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