Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing tabular barium titanate nanometer powder

A technology of plate-shaped barium titanate and nano-powder, which is applied in the field of preparation of plate-shaped barium titanate nano-powder, can solve the problems of difficult separation and control of products, easy formation of agglomerates, high processing temperature, etc. Pure powder, good dispersion effect

Inactive Publication Date: 2012-12-19
SHAANXI UNIV OF SCI & TECH
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-temperature solid-phase method has the advantages of simple process and low cost, but there are problems such as large particle size, serious agglomeration, difficult control of Ti / Ba ratio, low product purity, low yield, and difficulty in mixing components uniformly, resulting in uneven chemical composition of the product, etc. shortcoming
The disadvantages of the traditional sol-gel method are high cost, high processing temperature, and easy agglomeration of primary particles.
Co-precipitation method has low production efficiency, the product is not easy to separate and control, and there are many impurities
The hydrothermal method requires special high-pressure equipment, in which chloride salts are prone to corrosion problems and easy to form agglomerates

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing tabular barium titanate nanometer powder
  • Method for preparing tabular barium titanate nanometer powder
  • Method for preparing tabular barium titanate nanometer powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of barium titanate nanopowder comprises the following steps:

[0026] 1) Dissolve 192.14 g (1 mol) of citric acid in 300 ml of ammonia water with a volume concentration of 25%, then add 1.5 mol of butyl titanate and stir thoroughly to prepare solution A;

[0027] 2) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a volume concentration of 25%, then add 1.5mol of barium acetate and stir thoroughly to prepare solution B;

[0028] 3) According to the molar ratio of butyl titanate and barium acetate as 1:1, fully mix solution A and solution B, add 200ml of absolute ethanol, adjust the pH value to 5.0 with ammonia water, and then add 64.05g of polyethylene glycol Diol (PEG4000) is formulated into a precursor solution;

[0029] 4) Evaporate the precursor solution in a water bath at 80°C until a wet gel is obtained, and then dry and foam the wet gel at 130°C in an air atmosphere for 7 hours to obtain a dry gel;

[0030] 5) Calcini...

Embodiment 2

[0034] The preparation method of barium titanate nanopowder comprises the following steps:

[0035] 1) Dissolve 192.14 g (1 mol) of citric acid in 300 ml of ammonia water with a volume concentration of 28%, then add 2.5 mol of butyl titanate and stir thoroughly to prepare solution A;

[0036] 2) Dissolving 192.14g (1mol) of citric acid in 300ml of ammonia water with a volume concentration of 28%, then adding 2.5mol of barium acetate and fully stirring to prepare solution B;

[0037] 3) According to the molar ratio of butyl titanate and barium acetate as 1:1, fully mix solution A and solution B, add 300ml of absolute ethanol, adjust the pH value to 7.0 with ammonia water, and then add 96.07g of polyethylene glycol Diol (PEG6000) is formulated into a precursor solution;

[0038] 4) Evaporate the precursor solution in a water bath at 90°C until a wet gel is obtained, and then dry and foam the wet gel at 140°C in an air atmosphere for 5 hours to obtain a dry gel;

[0039] 5) Cal...

Embodiment 3

[0041] The preparation method of barium titanate nanopowder comprises the following steps:

[0042] 1) Dissolve 192.14 g (1 mol) of citric acid in 300 ml of ammonia water with a volume concentration of 28%, then add 2 mol of butyl titanate and stir thoroughly to prepare solution A;

[0043] 2) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a volume concentration of 28%, then add 2mol of barium acetate and stir thoroughly to prepare solution B;

[0044]3) According to the molar ratio of butyl titanate and barium acetate as 1:1, fully mix solution A and solution B, add 250ml of absolute ethanol, adjust the pH value to 6.0 with ammonia water, and then add 75g of polyethylene glycol Alcohol (PEG4000) is formulated into precursor solution;

[0045] 4) Evaporate the precursor solution in a water bath at 85°C until a wet gel is obtained, and then dry and foam the wet gel at 135°C in an air atmosphere for 6 hours to obtain a dry gel;

[0046] 5) Calcining the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing tabular barium titanate nanometer powder. The method comprises the following steps: dissolving complexing agent citric acid in an ammonia system; adding reacting raw materials tetrabutyl orthotita and barium acetate to form solution A and solution B; adding absolute ethanol and polyethylene glycol after the solution A and the solution B are mixed to prepare precursor solution; preparing dry gel after water-bath evaporation and dry foaming, and calcining the dry gel at constant temperature of between 720 and 850 DEG C to obtain the nanometer barium titanate powder. The prepared nanometer barium titanate powder is in regular tabular shape with grain size of between 40 and 150nm, and has high purity and good dispersibility without generation of BaCO3 crystalline phase.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and relates to a method for preparing plate-shaped barium titanate nanopowder. Background technique [0002] Barium titanate nanopowder is a white nanoscale titanate powder material with excellent electrical properties, such as high dielectric constant and ferroelectric, piezoelectric and positive temperature coefficient effects. Barium titanate nanopowder is an important basic raw material for electronic ceramic components, mainly used in the manufacture of dielectric ceramics and sensitive ceramics, and is widely used in automatic temperature control heating elements, multilayer ceramic capacitors, PTC thermistor devices, electro-optic devices and other fields. [0003] At present, the preparation methods of barium titanate nanopowder include high temperature solid phase sintering method, sol-gel method, co-precipitation method, hydrothermal method and so on. The high-tempera...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/626
Inventor 伍媛婷王秀峰
Owner SHAANXI UNIV OF SCI & TECH