Method for preparing perovskite nano powder

A nano-powder and perovskite technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problem of difficult control of stoichiometric ratio of composite perovskite powder, product agglomeration, dispersion of grain size distribution, etc. problem, to achieve the effect of simple and intuitive control method, complete powder crystallization, and concentrated distribution

Active Publication Date: 2015-04-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention mainly solves the problems of severe product agglomeration, dispersed grain size distribution, need for calcination to form phases, and difficulty in controlling the stoichiometric ratio of the composite perovskite powder in the conventional precipitation method.

Method used

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  • Method for preparing perovskite nano powder
  • Method for preparing perovskite nano powder
  • Method for preparing perovskite nano powder

Examples

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Effect test

Embodiment 1

[0046] Example 1, using tetrabutyl titanate as the B-site element source, Ba(OH) 2 ·8H 2 O and Sr(OH) 2 ·8H 2 O is the source of the A-site element, and Ba is prepared 0.6 Sr 0.4 TiO 3 Nanocrystalline powder

[0047] Measure 10ml of absolute ethanol with a pipette and place it in a beaker, weigh 8.5088g of tetrabutyl titanate (Ti(OC 4 h 9 ) 4 ) into a beaker and stirred until a clear yellow solution was formed, which was designated as solution A, and was transferred into a separatory funnel; 40ml of deionized water was added to a conical flask, 0.1g of PEG (molecular weight 4000) and 2ml of acetic acid were added, stirred evenly, and recorded Make solution B; slowly add solution A dropwise to solution B under vigorous stirring, keep stirring after the dropwise addition, add 4ml of ammonia water and continue stirring. Then put it in a water bath at 60°C for 1 hour to obtain a gel, and centrifuge to obtain the hydrated TiO required for the atmospheric pressure hydrother...

Embodiment 2

[0054] Example 2, using tetrabutyl titanate and zirconium n-butoxide (commercially available 1-butanol solution of zirconium n-butoxide with a mass fraction of zirconium n-butoxide of 80%) as the B-site element source, Ba(OH) 2 ·8H 2 O is A-site element source to prepare BaZr x Ti 1-x o 3 Nanocrystalline powder

[0055] Measure 12ml of absolute ethanol with a pipette and place it in a beaker, weigh 7.2325g of tetrabutyl titanate (Ti(OC 4 h 9 ) 4 ) and 3.2499g of zirconium n-butoxide in 1-butanol solution were added to the beaker, stirred until a clear yellow solution was formed, which was recorded as solution A, and moved into a separatory funnel; 50ml of deionized water was added to a conical flask, and 0.15g PEG (molecular weight 2000) and 3ml acetic acid, stir evenly, record as solution B; under the condition of vigorously stirring solution B, slowly add solution A to solution B, keep stirring after the addition, and slowly use a separatory funnel Add 5ml of ammonia ...

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Abstract

The invention provides a method for preparing ABO3 perovskite nano powder. The method comprises the following steps: dropwisely adding a B-site element source alcohol solution into surfactant/acetic acid-dissolved deionized water to obtain a mixed solution, adding ammonia water into the mixed solution, and reacting the reaction system at constant temperature to obtain a B-site element hydrous oxide gel; and preparing a B-site element hydrous oxide gel dispersion solution, adding an A-site element source into the dispersion solution, and carrying out hydrothermal reaction under normal pressure to obtain the ABO3 perovskite nano powder. The aqueous gel-normal pressure hydrothermal process and raw materials with lower cost are adopted, and the aqueous reaction is utilized to avoid the toxicity of the organic solvent. The pH value, surfactant amount, reaction raw material concentration, reaction time, reaction temperature and other conditions of the system are regulated to effectively control the size of the product, thereby obtaining the well-crystallized monodisperse perovskite powder with the particle size of 15-300nm.

Description

technical field [0001] The invention belongs to the field of perovskite material preparation, and in particular relates to a method for preparing perovskite nano powder. Background technique [0002] Common ABOs 3 ceramic materials with perovskite structure including BaTiO 3 , CaTiO 3 , PbTiO 3 、Ba x Sr 1-x TiO 3 、BaZr x Ti 1-x o 3 、Ba x Ca 1-x Ti y Zr 1-y o 3 Wait. Due to the excellent dielectric, ferroelectric, piezoelectric, and photocatalytic properties of perovskite ceramic materials, they have very extensive and important applications in industry. e.g. BaTiO 3 It plays an important role in thermistors, multilayer ceramic capacitors, electro-optical devices, etc.; BaZr x Ti 1-x o 3 and Ba x Ca 1-x Ti y Zr 1-y o 3 It has attracted attention in the fields of Y5V dielectric materials and lead-free piezoelectricity. Various perovskite ceramics have been intensively studied in thin films, sensors, energy storage, etc. [0003] The preparation method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C01G25/00B82Y30/00
Inventor 王晓慧刘佰博赵虔诚李龙土
Owner TSINGHUA UNIV
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