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Preparation method of iron-doped barium titanate nanoparticles

A nano-particle and barium titanate technology, applied in the directions of titanate, nanotechnology, alkaline earth metal titanate, etc., can solve the problems of high calcination temperature, uneven doping, grain growth, etc., and achieve a large specific surface area. , good crystallinity, promote the effect of lifting

Inactive Publication Date: 2019-03-01
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional solid-state sintering method generally causes unavoidable grain growth, and has disadvantages such as uneven doping, high calcination temperature, and cumbersome process.

Method used

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  • Preparation method of iron-doped barium titanate nanoparticles
  • Preparation method of iron-doped barium titanate nanoparticles
  • Preparation method of iron-doped barium titanate nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 0.7887g of Ba(OH)·8H 2 O and 0.0253g of Fe(NO 3 )·9H 2 O was dissolved in 50 ml of deionized water, 1.185 ml of di(2-hydroxypropionic acid) diammonium titanium hydroxide (50 wt % aqueous solution) was added thereto, and the mixture was fully stirred evenly. Add 11.25ml of 5M NaOH solution to the mixed precursor solution to adjust the pH value of the solution, then add 6.35ml oleic acid (OLA) under magnetic stirring, and transfer the above solution to a 100ml autoclave lining after stirring for 10min. At this time, 2.10 ml of tert-butylamine was added to the lining, and the sealed autoclave was placed at 220° C. for 24 hours, and then cooled to room temperature naturally. The precipitate was firstly washed with dilute hydrochloric acid, then washed several times with deionized water and absolute ethanol, filtered, and dried at 60°C in air to obtain iron-doped barium titanate nanoparticles.

[0020] The XRD pattern of the product is as figure 1 As shown in , all...

Embodiment 2

[0022] Weigh 0.7887g of Ba(OH)·8H 2 O and 0.0505g of Fe(NO 3 )·9H 2 O was dissolved in 50 ml of deionized water, 1.155 ml of titanium di(2-hydroxypropionic acid) diammonium dihydroxide (50 wt % aqueous solution) was added thereto, and the mixture was fully stirred evenly. Add 11.25ml of 5M NaOH solution to the mixed precursor solution to adjust the pH value of the solution, then add 6.35ml oleic acid (OLA) under magnetic stirring, and transfer the above solution to a 100ml autoclave lining after stirring for 10min. At this time, 2.10 ml of tert-butylamine was added to the lining, and the sealed autoclave was placed at 220° C. for 24 hours, and then cooled to room temperature naturally. The precipitate was first washed with dilute hydrochloric acid, then washed several times with deionized water and absolute ethanol, filtered, and dried in air at 60°C to obtain iron-doped barium titanate nanoparticles.

[0023] The XRD pattern of the product is as figure 1 As shown in , all...

Embodiment 3

[0025] Weigh 0.7887g of Ba(OH)·8H 2 O and 0.0169g FeCl 3 ·6H 2 O was dissolved in 50 ml of deionized water, 1.185 ml of di(2-hydroxypropionic acid) diammonium titanium hydroxide (50 wt % aqueous solution) was added thereto, and the mixture was fully stirred evenly. Add 11.25ml of 5M NaOH solution to the mixed precursor solution to adjust the pH value of the solution, then add 4.76ml oleic acid (OLA) under magnetic stirring, and transfer the above solution to a 100ml autoclave lining after stirring for 10min. After adding 2.10ml of tert-butylamine into the lining, place the sealed autoclave at 220°C for 24 hours of reaction, and then cool it down to room temperature naturally. The precipitate was firstly washed with dilute hydrochloric acid, then washed several times with deionized water and absolute ethanol, filtered, and dried in air at 60° C. to obtain iron-doped barium titanate nanoparticles.

[0026] The XRD pattern of the product is as figure 1 As shown in , all the d...

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Abstract

The invention discloses a preparation method of iron-doped barium titanate nanoparticles. The method comprises the following steps: taking barium hydroxide octahydrate and titanium bis(ammonium lactato)dihydroxide as a barium source and a titanium source; providing doped iron ions by utilizing soluble iron salt; firstly, dissolving the soluble iron salt into de-ionized water to form a mixed precursor solution; then regulating the pH (Potential of Hydrogen) value of the precursor solution by utilizing a 5 M sodium hydroxide solution; taking a proper amount of oleic acid and tert-butylamine as asurfactant and an additive; carrying out hydrothermal synthesis under the condition of 180 to 220 DEG C to obtain BiTi1-XFeXO3 (x is equal to 0.01 to 0.15) cubic-phase nanoparticles. The method provided by the invention has relatively low energy consumption and is simple and convenient to operate; the BiTi1-XFeXO3 (x is equal to 0.01 to 0.15) nanoparticles prepared by the method are tested and characterized as a cubic phase with high purity and good crystallinity. Compared with non-doped barium titanate, the iron-doped barium titanate nanoparticles have a relatively low optical band gap (2.6eV), a regular cubic shape and a relatively small crystal grain size (20 to 40 nm), so that the iron-doped barium titanate nanoparticles have relatively good photocatalytic activity and have a wide application prospect in the fields of scientific researches and electronic industries.

Description

technical field [0001] The invention belongs to the preparation of inorganic functional nanometer materials, in particular to a preparation method of iron-doped barium titanate nanoparticles. Background technique [0002] Barium titanate (BaTiO 3 ) is a metal oxide with a perovskite structure, due to its excellent ferroelectric, piezoelectric, dielectric, and optoelectronic properties, it is widely used in multilayer ceramic capacitors (MLCCs), organic field effect transistors, thermistors, pressure sensors There are huge application prospects in various electronic devices. A large number of studies have shown that doping modification of barium titanate can improve its physical and chemical properties by adjusting its structure, while barium titanate ABO 3 The type of perovskite structure has a high tolerance factor for different dopant ions, so the doping modification of barium titanate has become an effective way to improve its performance. Among them, the doping of tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00B82Y40/00
CPCB82Y40/00C01G23/006C01P2002/72C01P2002/84C01P2004/04C01P2004/64
Inventor 胡万彪李光辉谢继阳熊飞
Owner YUNNAN UNIV
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