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Method for preparing lanthanum-doped bismuth titanate nano powder by sol-gel hydrothermal method

A sol-gel, nano-powder technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., to achieve the effects of reducing production costs, simple equipment and good dispersibility

Active Publication Date: 2013-03-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no report on the preparation of lanthanum-doped bismuth titanate nanopowder by sol-gel-hydrothermal method in China

Method used

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  • Method for preparing lanthanum-doped bismuth titanate nano powder by sol-gel hydrothermal method
  • Method for preparing lanthanum-doped bismuth titanate nano powder by sol-gel hydrothermal method
  • Method for preparing lanthanum-doped bismuth titanate nano powder by sol-gel hydrothermal method

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Embodiment 1

[0033] Such as figure 1 As shown, the Bi of this embodiment 3.25 La 0.75 Ti 3 o 12 The preparation process includes the following steps:

[0034] According to Bi 3.25 La 0.75 Ti 3 o 12 Chemical formula, weigh analytically pure Bi(NO 3 ) 3 ·5H 2 O, La(NO 3 ) 3 ·6H 2 O and Ti(OC 4 h 9 ) 4 . First, the weighed Bi(NO 3 ) 3 ·5H 2 O and La(NO 3 ) 3 ·6H 2 O was dissolved in 20ml of glacial acetic acid solution, stirred by magnetic force for 10min, to obtain uniform solution A, the molar concentration of metal ions in solution A was 1mol / L; 4 h 9 ) 4 Add the solution dropwise to 20ml of ethylene glycol solution at a titration rate of 15mL / min, and stir it magnetically for 5min to obtain a uniform solution B; then add solution B dropwise to solution A at a titration rate of 3mL / min, and pass Stir magnetically for 2 hours to prepare a uniform sol; then dry the sol in an oven at 85° C. to obtain a xerogel, and grind to obtain a xerogel powder, that is, a hydroth...

Embodiment 2

[0039] According to Bi 3.25 La 0.75 Ti 3 o 12 Chemical formula, weigh analytically pure Bi(NO 3 ) 3 ·5H 2 O, La(NO 3 ) 3 ·6H 2 O and Ti(OC 4 h 9 ) 4 . First, the weighed Bi(NO 3 ) 3 ·5H 2 O and La(NO 3 ) 3 ·6H 2 O was dissolved in 20ml of glacial acetic acid solution, stirred by magnetic force for 10min to obtain uniform solution A, the molar concentration of metal ions in solution A was 2mol / L; 4 h 9 ) 4 The solution was added dropwise to a mixture of 20ml ethylene glycol methyl ether and acetylacetone (15ml ethylene glycol methyl ether and 5ml acetylacetone), the titration rate was 20mL / min, and stirred by magnetic force for 5min to obtain a uniform solution B; Solution B was added dropwise to solution A at a titration rate of 4mL / min, and stirred by magnetic force for 2 hours to form a uniform sol; then the sol was dried in an oven at 90°C to obtain a xerogel, which was ground to obtain a xerogel Rubber powder, namely the precursor of hydrothermal react...

Embodiment 3

[0041] According to Bi 3.5 La 0.5 Ti 3 o 12 , weigh the analytically pure Bi(NO 3 ) 3 ·5H 2 O, La(NO 3 ) 3 ·6H 2 O and Ti(OC 4 h 9 ) 4 . First, the weighed Bi(NO 3 ) 3 ·5H 2 O and La(NO 3 ) 3 ·6H 2 O is dissolved in the glacial acetic acid solution of 25ml, by magnetic stirring 10min, obtains uniform solution A, the molar concentration of metal ion in the solution A is 1.5mol / L; 4 h 9 ) 4 Add the solution dropwise into 25ml of ethylene glycol solution at a titration rate of 15mL / min, and stir it magnetically for 5 minutes to obtain a uniform solution B; then add solution B dropwise to solution A, and stir it magnetically for 2 hours to form a uniform The sol; then the sol was dried in an oven at 85°C to obtain a xerogel, which was ground to obtain a xerogel powder, that is, a hydrothermal reaction precursor. Put the hydrothermal reaction precursor into a hydrothermal kettle, add pure water as a solvent, and 6mol / L NaOH as a mineralizer, and the filling deg...

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Abstract

The invention discloses a method for preparing lanthanum-doped bismuth titanate nano powder by a sol-gel hydrothermal method, which comprises the following steps of: dissolving Bi (NO3) 3.5H2O and La (NO3) 3.6H2O into glacial acetic acid solution to obtain solution A; dropwise adding Ti (OC4H9) 4 into organic solvent to obtain solution B; dropwise adding the solution B into the solution A, and preparing even sol by magnetic stirring; putting the sol into a drying oven, and drying to obtain xerogel; grinding to obtain powdered hydrothermal reaction precursor; putting the hydrothermal reaction precursor into a hydrothermal kettle, and adding pure water taken as solvent and NaOH taken as mineralizer into the hydrothermal kettle; sealing the reaction kettle, and putting the reaction kettle into the drying oven at 160-170 DEG C; taking out products after reaction, and filtering to obtain precipitate; and finally, washing and drying the precipitate to obtain the lanthanum-doped bismuth titanate nano powder. The method can be used for preparing the lanthanum-doped bismuth titanate nano powder under the condition of low temperature, so that the energy is saved, and lanthanum-doped bismuth titanate is perfect in crystallization.

Description

technical field [0001] The invention relates to a preparation method of lanthanum-doped bismuth titanate nanopowder, in particular to a method for preparing lanthanum-doped bismuth titanate nanopowder by a sol-gel hydrothermal method. Background technique [0002] Bismuth titanate (Bi 4 Ti 3 o 12 , BTO) is a ferroelectric material with a layered perovskite structure, due to its high Curie temperature (675°C), large spontaneous polarization (50μC / cm 2 ) and good thermal stability, it has broad application prospects in capacitors, high-temperature piezoelectric sensors and optoelectronic devices, and has become one of the hotspots in the research of new functional materials. However, bismuth titanate material also has disadvantages such as high coercive electric field, large leakage conduction current, low remnant polarization and weak piezoelectricity, which severely limit its practical application. In 1999, B.H.Park et al. published La-doped Bi in Nature. 4 Ti 3 o 12 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00B82Y30/00
CPCY02P20/10
Inventor 陈志武康雄兵卢振亚
Owner SOUTH CHINA UNIV OF TECH
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